Q. No.
MacArthur showed that five closely related species of warblers living on the same tree were able to avoid competition and co-exist due to:
| 1. | Behavioral differences in their foraging activities. |
| 2. | Pre-zygotic reproductive isolation mechanisms |
| 3. | Physiological differences in acclimatization |
| 4. | Gene differentiation |
The human liver fluke depends on two intermediate hosts that are:
| 1. | A crustacean and a fish |
| 2. | A snail and a fish |
| 3. | An echinoderm and a fish |
| 4. | Fishes of two different species |
A population has more young individuals compared to older individuals. What would be the status of the population after some years?
1. It will decline
2. It will stabilize
3. It will increase
4. It will first decline and then stabilize
When the feeding efficiency of one species is reduced due to the inhibitory presence of the other species, even if resources are abundant, it is called:
| 1. | Interference competition | 2. | Exploitative competition |
| 3. | Amensalism | 4. | Predation |
When Darwin spoke of the struggle for existence, he was convinced that a potent force in organic evolution is:
| 1. | Intraspecific competition | 2. | Interspecific competition |
| 3. | Intraspecific mutualism | 4. | Interspecific mutualism |
The invasive prickly pear cactus in Australia was brought under control with the help of:
| 1. | Snail | 2. | Moth |
| 3. | Ladybug | 4. | Fungus |
| Assertion (A): | In every species, there are trade-offs between survival and reproductive traits. |
| Reason (R): | Life history traits are products of natural selection. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
In the formula for exponential growth (dN/dt = rN), what does ‘r’ stand for?
| 1. | the carrying capacity of the environment |
| 2. | the change in time |
| 3. | the number of individuals in the population |
| 4. | the intrinsic rate of natural increase of the population |
A population with a population pyramid that has an extremely broad base will most likely be:
| 1. | a rapidly expanding population |
| 2. | a stable population |
| 3. | a population where the birth rate equaled the death rate |
| 4. | a population where there were more old than young individuals |
© 2025 GoodEd Technologies Pvt. Ltd.