Give a scientific term :
Maximum number of individuals that an environment can support.

Name the scientist who is associated with the following:
Mass Flow Hypothesis

103.

Define Genetic Drift

(a) Organisms may be conformers or regulators. Explain this statement and give one example of each.
(b) Why are there more conformers than regulators in the animal world ?

Describe the inter-relationship between productivity, gross primary productivity and net productivity.

(a) Compare, giving reasons, the J-shaped and S-shaped models of population growth of a species.
(b) Explain ‘fitness of a species’’ as mentioned by Darwin.

Following are the responses of different animals to various abiotic factors. Describe each one with the help of an example.
(i) Regulate
(ii) Conform
(iii) Migrate
(iv) Suspend

If 8 individuals in a population of 80 butterflies die in a week, calculate the death rate of population of butteflies during that period.

In biotic community, which of the following can be called protective device ?

• Mimicry

• Symbiosis

• Competition

• Parasitism

It is much easier for a small animal to run uphill than a large animal, because

• smaller animals have a higher metabolic rate

• small animals have a lower O₂ requirement

• the efficiency of muscles in large animals in less than in the small animals

• the efficiency of muscles in large animals in less than in the small animals