Ruderal species are those which are found in the environments with (1) low disturbance, high competition (2) high disturbance, low competition (3) low disturbance, low competition (4) high disturbance, high […]
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CSIR NET Life Science Previous Year Questions and Solution on Ecology
Top-Down Effects of Introducing Piscivorous Fish: Long-Term Impacts on Lake Food Webs
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 […]
CSIR NET Life Science Previous Year Questions and Solution on Community Ecology
Ruderal Plant Strategies: Identifying Their Place in the Stress-Disturbance Matrix
A matrix of plant strategies based on four possible combinations of the intensities of stress and disturbance is given below: In this matrix, ruderal (r) plants are represented by (1) […]
CSIR NET Life Science Previous Year Questions and Solution on Community Ecology
Understanding Plant Life Forms: Correctly Matching Plant Types with Their Key Features
Column X lists various plant types and Column Y lists key features of these plants. Which one of the following options represents all correct matches between Column X and Column […]
CSIR NET Life Science Previous Year Questions and Solution on Ecology
Top-Down Control in Lakes: How Fish Populations Regulate Primary Productivity
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 […]
CSIR NET Life Science Previous Year Questions and Solution on Ecology
Top-Down and Bottom-Up Effects in Lake Ecosystems: Who Controls Whom?
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 […]
CSIR NET Life Science Previous Year Questions and Solution on Community Ecology
Annual Weeds of Arable Lands: Why They Are Classified as Therophytes
8. Annual weeds of arable lands are classified as (1) phonerophytes. (2) therophytes. (3) chamaephytes. (4) geophytes. Weeds are a persistent challenge in agriculture, affecting crop yields, soil health, and […]
CSIR NET Life Science Previous Year Questions and Solution on Ecology
Top-Down vs. Bottom-Up Effects in Lakes: Predicting Biomass Changes Across Trophic Levels
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 […]
CSIR NET Life Science Previous Year Questions and Solution on Community Ecology
Density Dependence: The Hallmark of Equilibrium in Natural Ecological Communities
Which of the following characterizes natural communities under equilibrium? (1) Biotic decoupling. (2) Species independence. (3) Large stochastic effects. (4) Density dependence. Understanding the dynamics of natural communities is a […]
CSIR NET Life Science Previous Year Questions and Solution on Ecology
Density Dependence in Birth and Death Rates: Identifying the Incorrect Statement for Two Species
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 […]
