Tag: CSIR NET Life Science Previous Year Questions and Solution 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 […]

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 […]

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 […]

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 […]

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 […]

Suppose you discovered a new species about which youknow only two facts: it is small sized (<10 cm) and shortlived (<20 days). Which of the following strategies is most likely to […]

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 […]

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) […]

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 […]

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 […]