Category: CSIR NET Life Science Previous Year Questions and Solution on Population Ecology

Category: CSIR NET Life Science Previous Year Questions and Solution on Population Ecology

CSIR NET Life Science Previous Year Questions and Solution on Population Ecology

Given below are the population pyramids of three different populations A, B and C depicting the relationship between birth and death rates in each. Based on the population pyramids given above, which one of the following is INCORRECT? (1) Population B has slower growth rate than population A. (2) Population C has birth rate higher than its death rate. (3) Population A represent a rapidly growing population. (4) Population B has the highest death rate among the three populations.

Understanding Population Pyramids: How Birth and Death Rates Shape Growth Trends

105.Among the following which trend shows the decreasing population- (1) More Individual in post reproductive stage (2) More individual in Pre-reproductive stage and reproductive (3) Less Individual in pre- reproductive stage & more in post reproductive stage (4) Less individual in reproductive stage & more in pre- reproductive stage 

How Age Structure Reveals Population Decline: Understanding Demographic Trends

Which of the following life history traits is most likely in a rodent species when snakes prefer to prey upon large, older individuals of the rodent species that grow continuously over their lifespan? (1) Early reproduction and slow growth rate (2) Delayed reproduction and fast growth rate, (3) Delayed reproduction and slow growth rate, (4) Early reproduction and fast growth rate, 

Life History Evolution in Rodents: How Predation by Snakes Shapes Growth and Reproduction Strategies

In a particular population A, individuals are under stress and they produce smaller offspring. Based on this, one may conclude that (1) stress in a population affects offspring size but not the number of offspring. (2) stressed adults prefer to produce smaller offspring that require less food. (3) stress may be linked to offspring size. (4) stress in a population directly affects offspring size. 

Does Stress Affect Offspring Size in Animal Populations? Exploring the Link Between Adult Stress and Offspring Traits

There are three species of frogs - A, B and C. Species A does not provide parental care for its eggs and larvae. Species B is subjected to predation by a predator that selectively feeds only on small-sized larvae. Species C faces progressively decreasing opportunities for breeding with increasing age. Assuming that resources available for reproduction are similar for A, B and C. Which of the following strategies would have been favored? (1) A should produce large number of small-sized offspring; B should produce a small number of large-sized offsprings; C should breed earlier in life. (2) Species A and B should produce a small number, of large-sized offspring and C should breed earlier in life. (3) Both species A and B should produce a large number of small-sized offspring and C should breed later in life but increase its clutch size. (4) Species A should produce a small number of large- sized offspring; B should 'produce a large number of small sized offspring and C should breed earlier in life with a small clutch size. 

Evolutionary Reproductive Strategies in Three Frog Species: Insights into Parental Care, Predation, and Breeding Timing

Suppose you discovered a new species about which youknow only two facts: it is small sized (

The Reproductive Strategy of Small, Short-Lived Species: What Science Predicts

In life history evolution there is generally a tradeoff between the size and number of offsprings produced. Some conditions are listed below: A. Scarcity of food during the early stages of life B. Provision of parental care C. High mortality during early stages of life D. Predator's preference for large sized prey What are the above two conditions that would favour the production of a small number of large-sized offspring? (1) B and C (2) Band D (3) A and B (4) A and C

What Favors the Evolution of Fewer, Larger Offspring? Parental Care and Predator Pressure in Life History Trade-Offs

Which one of the following statements supports the concepts of trade-off in the evolution of life history trades (1) Level of parental care and clutch size are positively correlated (2) Animals mature in early tend to live longer (3) An increase in the seed size is usually associated with the decrease in the seed number. (4) Allocation of higher energy for reproduction leads to higher population growth 

Trade-Offs in Life History Evolution: Seed Size Versus Seed Number as a Classic Example

The most important reproductive strategies of big trees in a forest are (1) earlier age at first reproduction and production of a large number of small seeds. (2) earlier age at first reproduction and production of a small number of large seeds. (3) later age at first reproduction and production of a large number of small seeds. (4) later age at first reproduction and production of a small number of large seeds. 

Reproductive Strategies of Big Trees in Forests: Delayed Reproduction and Fewer, Larger Seeds

A hormone facilitates oogenesis in mammals. The same hormone down regulates the transfer of nutrients from the placenta. The likely effect of the hormone on life history strategies is that it facilitates (1) 'r' type of reproduction. (2) 'K' type of reproduction. 

Hormonal Regulation of Oogenesis and Placental Nutrient Transfer: Implications for Life History Strategies in Mammals

Which one of the following trait set characterizes best ar selected species? (1) Usually a type lll survivorship curve, short life spanand density dependent mortality (2) Usually a type l survivorship curve, short life span and density dependent mortality (3) Usually a type l survivorship curve, long life span and density independent mortality (4) Usually a type lll survivorship curve, short life span and density independent mortality

Key Traits of r-Selected Species: Type III Survivorship, Short Life Span, and Density Independence

Compared to K-selection, r-selection favours (1) rapid development, smaller body size and early,semelparous reproduction. (2) rapid development, smaller body size and early,iteroparous reproduction. (3) slow development, larger body size and late, iteroparous reproduction. (4) slow development, smaller body size and late, iteroparous reproduction  

How r-Selection Differs from K-Selection: Traits of Rapid Developers and Early Reproducers

A species whose life history strategies allow for high intrinsic rates of increase (r- strategist) will also exhibit the following EXCEPT (1) high tolerance for both environmental instability and low-quality resources. (2) short period of exponential population growth (r) (3) reproductive strategy that involves random mating, semelparity and little or no parental investment (4) survivorship that show density-dependent mortality, typically exhibiting Type l or 2 survivorship curves.  

Which Trait Is NOT Typical of r-Strategists? Understanding Life History Patterns in Fast-Growing Species

One life history trait that is not characteristic of verysmall sized organisms is (1) delayed age at first reproduction. (2) earlier age at first reproduction. (3) high population growth rate. (4) short lifespan.  

Which Life History Trait Is NOT Typical of Very Small Organisms? Understanding Growth and Reproduction Patterns

A specialist species has a (1) wider niche and high efficiency of niche utilization (2) narrower niche and high efficiency of niche utilization (3) wider niche and low efficiency of niche utilization (4) narrower niche and low efficiency of niche utilization 

Specialist Species: Narrow Niche and High Efficiency of Niche Utilization Explained

What do mayflies, Pacific salmon (Oncorhynchusspp.) and annual grain crops have in common? They all are (1) semelparous (2) iteroparous (3) oviparous (4) Viviparous 

What Do Mayflies, Pacific Salmon, and Annual Grain Crops Have in Common? The Semelparity Strategy Explained

Which statement is correct for r-selected species? (1) Large number of progeny with large size (2) Small number of progeny with large size (3) Large number of progeny with small size (4) Small number of progeny with large size 

What Defines r-Selected Species? Large Number of Small Progeny Explained

There are diverse ecological adaptive strategies in which some organism are favored due to more energy investment on their reproductive rate while other are favoured on basis of investing large energy for homeostasis. Such a selection strategies are termed as (1) r- and K-selection (2) Logistic and exponential selection (3) Directional and disruptive selection (4) Kin and group selection 

r- and K-Selection: Understanding Adaptive Strategies in Ecology

The characteristic of a population with low value of intrinsic growth (r = 0.2) is (1) Late sexual maturity and small clutch size (2) Early sexual maturity and small clutch size (3) Late sexual maturity and large clutch size (4) Early sexual maturity and large clutch size

What Characterizes a Population With Low Intrinsic Growth Rate? Understanding Life-History Traits

Characteristic feature of K-selected species is (1) High intrinsic rate of growth (2) Small size and large number of offsprings (3) First reproduction at later stage of life (4) Short life span 

Key Features of K-Selected Species: Delayed Reproduction and Life-History Strategies

The organism with high parental care will also show (1) Semelparity (2) Iteroperety (3) Maturation at early stage (4) Small sized offsprings

High Parental Care in Organisms: Why Iteroparity Is the Key Reproductive Strategy

Among the following which is not an characteristic feature of r-selected species? (1) Delayed Maturity (2) Large clutch size (3) Small size of offspring (4) semelperity  

Which Is NOT a Characteristic of r-Selected Species? Key Traits Explained

Among the following which statement is false about r- selected species- (1) Long generation time (2) Many offspring (3) Short life cycle (4) Tendency to disperse 

Which Trait Is NOT a Characteristic of r-Selected Species? Understanding r-Selection in Ecology

Among the following which is not an characteristic of r-Selected species- (1) Early sexual maturity (2) Short life span (3) Small size of offspring's (4) Iteroperity 

Which Trait Is Not Typical of r-Selected Species? Understanding r-Selection in Ecology

r-selection is characterized by- (1) Early sexual maturity (2) High parental care (3) Few offsprings (4) Large sized offsprings

What Defines r-Selection? Early Sexual Maturity and Other Key Traits Explained

r-selected species have (1) Long generation time (2) Large clutch size (3) More parental care (4) Specialized niche

Key Traits of r-Selected Species: Understanding Large Clutch Size and Reproductive Strategy

Given below are a set of statements about metapopulation dynamics and habitat conservation: A. The sizes of suitable patches are important because demographic stochasticity can lead to extinction, especially in organisms with low reproductive output. B. In the incidence function model (IFM), the extinction risk of local populations increases with increasing habitat patch area, and the colonization probability is a function of patch isolation from existing local populations. C. From the conservation perspective, large numbers of suitable patches are not sufficient if distances are too large, preventing recolonization and the rescue effect. D. To minimize extinction risk there should be as low a variance in local patch quality as possible, to allow for synchronous dynamics. Which one of the following options represents the combination of all correct statements? (1) A and C (2) B and C (3) A and D (4) B and D  

Metapopulation Dynamics and Habitat Conservation: Identifying the Most Accurate Statements

The dynamics of any subpopulation within a metapopulation differs from-that of a normal population in that the (1) birth rates are lower than the death rates. (2) death rates are lower than the birth rates. (3) immigration and emigration rates are significantly higher. (4) immigration and emigration rates are negligible. 

How Metapopulation Subpopulations Differ: The Role of Immigration and Emigration in Population Dynamics

A small lake has three trophic levels- phytoplankton(autotrophs),Zooplankton (herbivore) and planktivorous fish (primary carnivore). Into this lake, a population of piscivorous fish (secondary carnivore) was introduced to study the 'top-down' effects". What is the expected long-term consequence of such an introduction to phytoplankton and zooplankton trophic levels?  (1) Zooplankton biomass will increase and phytoplankton biomass will decrease. (2) Zooplankton biomass will decrease and phytoplankton biomass will increase. (3) The biomasses of both zooplankton and phytoplankton will increase. (4) The biomasses of both zooplankton and phytoplankton will decrease.

Top-Down Effects of Introducing Piscivorous Fish: Long-Term Impacts on Lake Food Webs

In a lake, reducing the population of a fish which feeds on plankton was followed by a declinein the rate of primary productivity. This is consistent with which one of the following hypotheses regarding the regulation of primary productivity? (1) Bottom-up control (2) Eutrophication (3) Top-down control (4) Trophic pyramid

Top-Down Control in Lakes: How Fish Populations Regulate Primary Productivity

In a lake ecosystem, bottom-up effects (B) refers to control of a lower trophic level by the higher trophic levels and top down effects (T) refer to the opposite. In a lake with three trophic levels - Phytoplankton (P), Zooplankton (Z) and Carnivore (C), (1) P and C are controlled by B, and Z is controlled by T (2) P, Z and C are all controlled by T (3) P is controlled by B, Z is controlled by T and C is controlled by B (4) P is controlled by T, Z is controlled by B and C is controlled by T

Top-Down and Bottom-Up Effects in Lake Ecosystems: Who Controls Whom?

Two lakes (l and ll) with a similar trophic structure ofphytoplankton-zooplankton, planktivorous fish foodchain were chosen. To understand the 'top-down' effects, some piscivorous fish (those that feed on planktivorous fish) were introduced into Lake l, making it a system with four trophic levels. Lake ll was enriched by adding large quantities of nitrates and phosphates to study the 'bottom-up' effects over a period of time. Changes in the biomasses of each trophic level were measured. The expected major changes in the two lakes are (1) In Lake l zooplankton biomass increases, phytoplankton biomass decreases. In Lake ll both phytoplankton and planktivorous fish biomasses increase. (2) In Lake l zooplankton biomass decreases, phytoplankton biomass increases. In Lake ll both phytoplankton and planktivorousfish biomasses increase. (3) In Lake l planktivorous fish biomass and phytoplankton biomass decrease. In Lake ll phytoplankton biomass increases, planktivorous fish biomass decreases. (4) In Lake l planktivorous fish and zooplankton biomasses increase. In Lake ll both phytoplankton and planktivorus fish biomasses increase. 

Top-Down vs. Bottom-Up Effects in Lakes: Predicting Biomass Changes Across Trophic Levels

Which of the following statements about the birth rates (b1, b2) and death rates (d1, d2) of species 1 and 2 indicated in the figure is NOT true? (1) Birth rates of species 1 are density independent. (2) Death rates of both species are density dependent. (3) Birth rates of species 2 are density dependent. (4) Density dependent effects on death rates are similar for both the species.

Density Dependence in Birth and Death Rates: Identifying the Incorrect Statement for Two Species

The birth rates (b) and death rates (d) of two - species 1 and 2 in relation to population density (N) are shown in the graph. Which of the following is NOT true about the density dependent effects on birth rates and death rates? (1) Birth rates are density-dependent in species 1 and density-independent in species 2 (2) Death rates are density-dependent in both the species. (3) Density-dependent effect on birth rate is stronger in species 1 than in species 2. (4) The density-dependent effects on death rates are similar in both the species. 

Density-Dependent Effects on Birth and Death Rates: What the Graph Reveals About Two Species

An observation was made on a species experiencing three factors A, B and C in order to infer a density dependent population regulation by a factor. The following graph shows the relationship between the adverse effect of the factors in terms of number and population density. Based on the above observation, which of the following is correct? (1) A - Density independent; B = Density dependent; C - Inversely density dependent (2) A - Inversely density dependent; B- Density independent; C - Density dependent (3) A - Density dependent; B = Inversely density independent; C - Density independent (4) A - Density dependent; B = Density independent; C - Inversely density dependent

Understanding Density-Dependent, Density-Independent, and Inversely Density-Dependent Factors in Population Regulation

0 The correclining exponentially under depleting t graphical representation of a bacteria decnutrient condition is

Graphical Representation of Bacterial Decline Under Depleting Nutrient Conditions

Among the following which is not an density dependent factor effecting population (1) Competition (2) Food (3) Temperature (4) Nutrients

Which Factor Is Not Density Dependent? Understanding Population Regulation in Ecology

Among the following ecological factor which is not a density dependent factor (1) Food (2) Predation (3) Disease (4) Extreme temperatures

Which Ecological Factor Is Not Density Dependent? Understanding Population Regulation

Temporary fluctuation in number of individuals aroundthe carrying capacity in most of populations is due to (1) density dependent factors (2) density independent factors (3) Bottle neck phenomenon (4) Interspecific competition 

Why Do Populations Fluctuate Around Carrying Capacity? The Role of Density-Dependent Factors

The graph below shows the relationships of per capita population growth rate (r), fecundity (b) and age at first reproduction (α) in an animal species. What is the most important conclusion to be drawn from the graph? (1) The later the age of first reproduction, the lower is the population growth rate achieved. (2) The population growth rate decreases as first reproduction is postponed to a later stage, regardless of the fecundity. (3) At any α, the higher the fecundity, the higher is the population growth rate achieved. (4) As the age at first reproduction is postponed further, the benefits of increasing fecundity on the population growth rate become progressively negligible.

How Age at First Reproduction, Fecundity, and Population Growth Rate Interact: Key Insights from Population Ecology

Three important biological parameters— generationtime, population growth rate (r) and metabolic rate per gram body weight are a function of the organism's body size. Which of the curves (a) or (b) represents the correct relation of each of the parameters to body size? (1) Generation time — (a); population growth rate — (b); metabolic rate/g bw — (a) (2) Generation time — (a); population growth rate — (b); metabolic rate/g bw — (b) (3) Generation time — (b); population growth rate — (a); metabolic rate/g bw — (a) (4) Generation time — (b); population growth rate — (b), metabolic rate rate/g bw — (a)

How Generation Time, Growth Rate, and Metabolic Rate Relate to Body Size: Decoding Biological Scaling Curves

What parameter, plotted on Y-axis against generationtime, would yield the curve shown in the figure?   (1) Survivorship (2) Body size (3) Lifespan (4) Intrinsic rate of growth

What Does the Curve of Generation Time Reveal? Identifying the Y-Axis Parameter in Population Growth Studies

Among the following which graph best represent relationship between intrinsic rate of growth 'r' and generation time 't

Intrinsic Rate of Growth vs. Generation Time: Understanding Their Inverse Relationship in Population Ecology

The curve shown below shows a relationship between (1) Time (X) and Population density (Y) (2) Body size (X) and generation time (Y) (3) Generation time (X) and intrinsic rate of growth (Y) (4) Fish length(X) and fish body weight(Y)

Fish Length vs. Weight: Understanding the Classic Length-Weight Relationship Curve

Among the following which combination shows positive relationship? (1) Generation time and animal size (2) Generation time and intrinsic rate of growth (3) Animal size and number of offspring (4) Longevity and number of offspring

Which Life-History Traits Show a Positive Relationship? Exploring Generation Time, Animal Size, and Offspring Number

The three graphs (A, B, C) show population growth (N) patterns in relation to N or time (t) Which of the following is correct with reference to the Y-axis label and the type of population growth? (1) A: Y-axis: Nt, exponential growth B: Y-axis: dN/dt, logistic growth C: Y-axis: ln(N), exponential growth (2) A: Y-axis: dN/dt, exponential growth      B: Y-axis: ln(N), logistic growth      C: Y-axis: Nt, exponential growth (3) A: Y-axis: ln(N), exponential growth      B: Y-axis: dN/dt, logistic growth      C: Y-axis: Nt, exponential growth (4) A: Y-axis: dN/dt, exponential growth 

Population Growth Graphs: Correct Y-Axis Labels and Growth Types Explained

Which of the following represents exponential growth in populations? 

Exponential Growth in Populations: The J-Shaped Curve Explained

Consider the following graphs for per capita growth rate () ()as a function of population density (N).  Which one of the plots correctly depicts strong Allee effect in a population? (1) A (2) B (3) C (4) D

Understanding the Y-Axis in Logistic Growth Graphs: The Role of Population Growth Rate

The following graph is for a logistically growing population, with Ntplotted on the X-axis. What is the parameter plotted on the Y-axis? (1) dN/dt (2) Nt+1 (3) dN/dt. 1/N (4) K   

Understanding the Y-Axis in Logistic Growth Graphs: The Role of Population Growth Rate

Which of the following curves represents the generalrelationship between population size (N) and growthrate (dN/dt) for logistically growing population?v 

Which Curve Best Represents the Relationship Between Population Size and Growth Rate in Logistic Growth?

Which graph best explains the population growing under saturated conditions of resources? 

Which Graph Best Depicts Population Growth Under Saturated Resource Conditions?

Which of the following plots best depicts growth as perthe logistic 

Which Plot Best Represents Logistic Growth? Understanding the S-Shaped Curve

Which of the following correctly represents the relationship between the rate of population growth and population size? 

How Does Population Growth Rate Relate to Population Size? A Scientific Overview

Among the following which follows the populationgrowth pattern according to equation dN/dt=rN whenresources are unlimited  

Exponential Population Growth: The dN/dt = rN Equation Explained

A population of crickets invading a new grassland showed a population growth pattern as shown in the figure: Following is the list of potential interpretations:= A. Environment is damaged due to population overshooting its K B. The resources did not recover and population dies out C. Carrying capacity is lowered due to shift in environmental conditions. Which one of the following options/combination of options can correctly explain the cricket growth pattern? (1) A only (2) B only (3) A and C only (4) B and C only

Cricket Population Crash: Understanding the Causes Behind Sudden Declines in Grassland Invaders

A plot of dN/dt as a function of population densityyields a (1) rectangular hyperbola (2) negative exponential curve (3) positive rectilinear curve (4) bell- shaped curved

Understanding the Bell-Shaped Curve: The Hallmark of Logistic Growth in Population Dynamics

Among the following which curve represents logisticgrowth? (1) A (2) B (3) C (4) D

Which Curve Represents Logistic Growth? Understanding the S-Shaped Curve

A small number (approximately 10) of mice are introduced into an uninhabited island. Their population grows exponentially initially and after 3 years, reaches a population size of 520 after which the population becomes stable. At what point would you expect their population to attain their highest growth rate? (1) When the mice population was first introduced. (2) When the population size is 260. (3) Their population growth rate, remains constant throughout. (4) When the population size reaches 520

When Do Mice on an Island Reach Their Highest Population Growth Rate?

Carrying capacity of a forest is 20 tones which increases 10 % of its biomass annually. For sustainable forestry how much trees can be harvested for timber so that it has minimum effect on forest and can be harvested annually (1) 20 tones (2) 10 tones (3) 1 tones (4) 0.5 tones 

How Much Timber Can Be Sustainably Harvested from a Forest at its Carrying Capacity?

In a population growing logistically and approachingCarrying Capacity (K), the change in density (N) per unittime (dN/dt) is maximum when N equals to (1) K2  (2) K/2. (3) K (4) K/4 

When Is the Change in Population Density Greatest in Logistic Growth?

Sustainable harvesting for a fish population growing logistically is done at (1) Above carrying capacity (2) At carrying capacity (3) At half of the carrying capacity (4) At lowest level 

Where Should Sustainable Harvesting Be Done for a Logistically Growing Fish Population?

A bacteria growing exponentially with doubling rate of10 minutes. The intrinsic rate of growth would bemaximum when bacterial numbers are- (1) at carrying capacity (2) half of carrying capacity (3) Start of log phase (4) remains constant at all phases

When Is the Intrinsic Growth Rate Highest in Exponentially Growing Bacteria?

Which is most favorable for maximum sustainable harvesting of resources? (1) Major part of population is near or around the carrying capacity (2) Population is at half of the carrying capacity (3) Population is one fourth below the carrying capacity (4) Population has slow doubling time 

Which Population Size Is Best for Maximum Sustainable Harvesting of Resources?

Maximum growth rate is observed in logistic equationwhen the organisms are at (1) N > K (2) N=K/2 (3) N = K (4) N < K  

When Is the Growth Rate Highest in Logistic Population Growth?

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At What Population Size Is the Growth Rate Maximum in Logistic Growth?

For a species having logistic growth, if K = 20,000 and r = 0.15, the maximum sustainable yield will be (1) 450 (2) 1500 (3) 3000 (4) 6000 

How to Calculate Maximum Sustainable Yield for a Species with Logistic Growth

The birth rates and death rates of an insect are 0.25 and 0.05 respectively. In a habitat with a carrying capacity of 500, when the population density is 100, by how much does the insect population size increase per unit time if (a) the growth is exponential and (b) growth is logistic? (1) a: 16, b:20 (2) a : 20, b: 20 (3) a: 20, b: 16 (4) a: 25, b: 20

Exponential vs. Logistic Growth: Calculating Insect Population Increase Per Unit Time

A Population is growing logistically with a growth rate (r) of 0.15/week, in an environment with a carrying capacity of 400. What is the maximum growth rate (NO) of individuals/week) that this population can achieve? (1) 15 (2) 30 (3) 22.5 (4) 60 

How to Calculate the Maximum Growth Rate for a Logistically Growing Population

The population size of a bird increased from 600 to 645 in one year. If the per capita birth rate of this population is 0.125, what is its per capita death rate? (1) 0.25 (2) 0.15 (3) 0.05 (4) 0.02

How to Calculate Per Capita Death Rate from Bird Population Growth and Birth Rate

The population density of an insect species increasesfrom 40 to 46 in one month. If the birth rate during thatperiod is 0.4. What is the death rate? (1) 0.25 (2) 0.15 (3) 0.87 (4) 0.40

How to Calculate Death Rate from Insect Population Density and Birth Rate

If gypsy moth egg density is 160 at time t and 200 at t + 1, what will be its value at time t + 3, assuming that egg density continues to increase at constant rate? (1) 250 (2) 280 (3) 312 (4) 390 

How to Project Gypsy Moth Egg Density Over Time Using Linear Growth

The graph below shows the change in the size of four populations (A-D) over time. Which among the four populations (A, B, C, and D) would have the lowest intrinsic rate of population growth (r)? (1) A (2) B (3) C (4) D 

Which Population Has the Lowest Intrinsic Rate of Growth? Interpreting Population Graphs

The general relation between generation time (T) and population growth rate (r) is described by the equation (1) lnr = lna -b lnT (2) r = a-bT (3) lnr= lna + blnT (4) r=a+ bT

Understanding the Relationship Between Generation Time and Population Growth Rate

For a population growing exponentially with a growthrate r, its population doubling time is (1) (N0x 2) (2) ln 2/r (3) λ ln 2 (4) lnr X 2 

How to Calculate Doubling Time for an Exponentially Growing Population

Given below are growth equations where dN/dt is defined as A. rN/K B. rN C. rN[(K-N)/N] D. rN[(K-N)/K] With reference to the above equations, which one of the following statements is correct? (1) B represents exponential growth and A represents logistic growth. (2) B represents exponential growth and D represents logistic growth (3) B represents zero growth and C represents logistic growth (4) A represents exponential growth and D represents logistic growth

Which Equations Represent Exponential and Logistic Population Growth? A Comprehensive Guide

In the following equations (a) dN /dt = rN (b) Nt= NOert (c) dN/dt = rN (K-N/K) (d) dN/dt=rN x N/K Exponential population growth is described by (1) a and b. (2) a only. (3) e only. (4) b and d. 

Which Equations Describe Exponential Population Growth? A Guide to Population Models

The net reproductive rate (RO) is 1.5 for a given population. If Nt, the population of females at generation t, is 500, then what will be the population of females after four generations (Nt+4)? (1) 1125.000 (2) 2531.250 (3) 1265.625 (4) 3796.875

How to Project Female Population Size Using Net Reproductive Rate Over Four Generations

In a population showing exponential growth, per capita growth rate will: (1) decrease as population size increases described by the equation (1) lnr = lna -b lnT (2) r = a-bT (3) lnr= lna + blnT (4) r=a+ bT

Per Capita Growth Rate in Exponential Population Growth: Understanding the Equation

25. In an experimental population the birth rate is 18 per 1000 and death rate is 14 per 1000. Size of population is 10,000 at time, ‘t’, then what will be size of population at time 't+1' (1) 10,000 (2) 10,040 (3) 10,140 (4) 11,040

How to Calculate Population Size After One Year Using Birth and Death Rates

In population of 10 million individuals, birth rate is 19 per 1000 and death rate is 14 per 1000. Annual rise in population would be (1) 50,000 (2) 5,000 (3) 14,000 (4) 500,000 

How to Calculate Annual Population Rise Using Birth and Death Rates

Consider that two population are growing exponentiallywith initial difference in growth rate of 10 %. After 10generation the approximate difference between two population sizes would be? (1) 1:1 (2) 4:1 (3) 2:1 (4) 10:1 

How a 10% Difference in Growth Rate Affects Two Exponentially Growing Populations Over 10 Generations

If two bacterial culture are growing exponentially with different in their intrinsic rate of growth. The difference in both population will differ (1) Increase linearly (2) Decrease linearly (3) Increase exponentially (4) Decrease exponentially

How Does the Difference in Growth Rates Affect Two Exponentially Growing Bacterial Cultures?

In a graph population size (N) is plotted on X-axis then what should be plotted on Y-axis to get a bell shape curve for K-selected species (1) dN/dt (2) 1-dN/dt (3) T (4) Nt-1 

How to Plot a Bell Curve for K-Selected Species: Understanding Population Growth Graphs

The maximum population size of a biological species that can be sustained by that specific environment, given the food, habitat, water, and other resources available around which stable well adapted populations fluctuate around a mean value is termed as (1) Genetic drift (2) Disease & Mortality (3) Carrying capacity (4) Migration

Carrying Capacity: The Maximum Sustainable Population Size Explained

At a given time, the age class distribution of a population was as shown in figure: Which of the following can be inferred from the figure? (1) Age class 2 has maximum fecundity (2) Age class 2 has maximum survival (3) Age class distribution is at equilibrium (4) Age class distribution is not at equilibrium

What Can You Infer from an Age Class Distribution Figure? Understanding Population Equilibrium

17.Suppose a population has three age classes. Females in the second and third age classes produce four and three offsprings, respectively. While 50% female in the first age class survive into the second age class, only 30% females survive into the third age class. The If there are 10 individuals in each of the three age classes, the number of individuals in the next iteration would be: (1) 50 (2) 78 (3) 100 (4) 65

How to Calculate the Next Generation Size in an Age-Structured Population

The following is the life table of a natural population of a small annual succulent where 'x' is its life phase, 'lx' is its survivorship till that stage and 'dx' is its age specific mortality. Which of the following options from the above life phases show the lowest age specific mortality rate? (1) Seeds produced (2) Germinated (3) Established (4) Rosettes

Which Life Phase of a Small Annual Succulent Has the Lowest Age-Specific Mortality Rate?

Complete the following hypothetical life table of aspecies to calculate the net reproductive rate Ro:  The calculated Ro will be (1) 0.75 (2) 1.00. (3) 0.65. (4) 1.15.

How to Complete a Hypothetical Life Table and Calculate Net Reproductive Rate (R₀)

Following is the hypothetical life table for species Which one of the following is the correct net reproductive rate (R0) (1) 0.0 (2) 0.3 (3) 0.7 (4) 1.5

How to Determine the Net Reproductive Rate (R₀) from a Hypothetical Life Table

The following table shows survival and fertility data for a seasonally breeding species. Based on above data net reproductive rate (Ro) of the species will be (1) 1 (2) 5 (3) 10 (4) 20

How to Calculate Net Reproductive Rate (R₀) for a Seasonally Breeding Species

12. If rate of mortality and natality become constant in each age group. Then the result would l increasebe- (1) Number of children increase (2) Number of older one will increase (3) Number of individuals in reproductive stage wil (4) The increase or decrease within any cohort will become independent of othe

What Happens When Mortality and Natality Rates Are Constant in Each Age Group?

11.The average number of offspring that a female produces during her lifetime is called (1) Fecundity (2) Net reproduction rate (3) Survivorship curve (4) Reproductive Mortality

What Is the Average Number of Offspring a Female Produces in Her Lifetime? Understanding Fecundity

Given below are growth and survivorship curves. Select the correct combination of growth curves from figure A and survivorship curves from figure B given above, that would best represent r and K strategies, respectively. (1) r = a and l; K = b and n (2) r=b and n; K=a and l (3) r = a and m; K = b and n (4) r=b and m; K=a and m 

Matching r and K Strategies to Growth and Survivorship Curves: A Complete Guide

8. Following is the diagram of three idealized survivorship curves of animals.   Find the correct match between the group of animals and the respective survivorship curves. (1) Marine pelagic fish and large mammals -lll and l, respectively (2) Marine pelagic fish and large mammals- l and ll, respectively. (3) Some birds and large mammals - l and lll, respectively. (4) Marine pelagic fish and some birds - l and lll, respectively.

Matching Animal Groups to Survivorship Curves: Marine Pelagic Fish, Large Mammals, and Birds

In natural system, a species producing large number of offsprings with little or no parental care generally exhibits which one of the following kind of survivorship curve

Which Survivorship Curve Do Species with Many Offspring and Little Parental Care Exhibit?

Perennial habit among trees would be more preferred under conditions (1) Low survival during sapling stage and high during adult (2) High survival during sapling stage and high during adult (3) Low survival during sapling stage and low during adult (4) High survival during sapling stage and low during adult

Perennial Habit in Trees: Why It’s Favored by Certain Survival Patterns

The characteristic survivorship curve lll is shown by (1) Fruit flies (2) Pelagic fishes (3) Birds (4) Humans  

Which Species Show a Type III Survivorship Curve? Exploring Characteristic Examples

. The type of survivorship curve observed in Pelagic fishes (1) A (2) B (3) C (4) D

Pelagic Fish Survivorship Curve: Which Type Do They Exhibit and Why?

2.Two species of plants were sampled in 32 quadrats in a forest. The mean and variance for the occurrence of species 1 were 16.2 and 48 and species 2 were 3.6 and 3.2 respectively. Which of the following statements about the distribution of the two species in these quadrats is supported by these findings? (1) Both species are distributed randomly. (2) Species 1 is distributed randomly and species 2 is clustered. (3) Species 1 is clustered and species 2 is distributed randomly. (4) Both species are clustered.

Plant Species Distribution Patterns: Interpreting Mean & Variance in Ecological Sampling

6. The type of vegetation in climate having annual temperature range 5-200C and rainfall 150-300 mm will be (1) Temperate rain forest (2) Temperate grasslands (3) Boreal forests (4) Tropical rainforests

Understanding Temperate Grasslands: Vegetation in Climates with Moderate Temperatures and Low Rainfall

The following table shows the mean and variance of population densities of species A, B and C. Based on the above, which of the following statements is correct? (1) Species A and B show uniform distribution, whereas species C shows clumped distribution. (2) Species A shows random distribution, species B shows uniform distribution, and species C shows clumped distribution. (3) Species A and B show clumped distribution, whereas species C shows uniform distribution. (4) Species A shows clumped distribution, species B shows random distribution, and species C shows uniform distribution.

Understanding Population Density and Distribution Patterns in Ecology

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