Consider the following statements:

I:	When certain exotic species are introduced into a geographical area, they become invasive because the invaded land does not have its natural predators.
II:	Competition is best defined as a process in which the fitness of one species is significantly lower in the presence of another species.
III:	Biological control methods adopted in agricultural pest control are based on the ability of the predator to regulate the prey population.

Which of the above statements are true?

1.	I and II only	2.	I and III only
3.	II and III only	4.	I, II, and III

All the following are the reasons for the increase in the population of present-day India except:

1. An increasing birth rate

2. A rapidly declining death rate

3. Decreasing maternal mortality rate

4. Decreasing infant mortality rate

Ecology at the organismic level is essentially:
1. Physiological ecology
2. Biochemical ecology
3. Anatomical ecology
4. Pathological ecology

As a mechanism of defense against herbivory, Calotropis:
1. Has a large number of thorns
2. Secretes cardiac glycosides
3. Produces a neurotoxin, strychnine
4. Releases a hallucinogen

A feature of ‘r’ strategists would be:

The maximum population size of the species that the environment can sustain indefinitely is called as:

A community of living organisms in conjunction with the nonliving components of their environment, interacting as a system is termed:

The threat of extinction will be highest for:

The growth rate of a natural population equals zero:

The growth of a population is unlikely to be limited by: