Category: CSIR NET Life Science Previous Year Questions and Solution on EVOLUTION AND BEHAVIOUR

Which of the following behavioural changes are expected in a rat when its nucleus accumbens is experimentally ablated? (1) Aggressive behaviour increases (2) Exploratory behaviour decreases (3) Nest-building activity increases […]

In a cooperatively breeding species, under which condition is a helper more likely to exhibit philopatry? (1) If adult survivorship is higher for group members than for solitary individuals (2) […]

In rats, after the delivery of the offspring, mother shows the following behaviors. Which one of the following behaviors is NOT maternal? (1) Licking the pups (2) Huddling above the […]

Greater male investment in the care of offspring is most likely to lead to (1) a lek system. (2) stronger female choice. (3) Reverse sexual dimorphism (4) run-away selection.   […]

In a large, healthy, polygynous population of an ungulate species with distinct, short seasonal mating, the operational sex ratio (Male: Female) is likely to resemble which one of the following […]

The ratio of variance in male mating success (Vm) to variance in female mating success (Vf) is strongly male biased (Vm>Vf) in species P, strongly female biased in species Q […]

Competition for mates and variance in fitness is higher among females than among males in which of the following animal mating systems? (1) Monogamy (2) Polygyny (3) Polyandry (4) Sequential […]

The following situations might lead to the evolution of monogyny in birds: A. Male has to assist the female in rearing the offspring. B. Male guards the female against other […]

In a bird species A, the male alone builds the nest, incubates the eggs and feeds the nestling. In bird species B, it is the female that does all that. […]