Assertion (A): | Ecologically similar species can coexist in a community if one or more significant differences in their niches arise through time. |
Reason (R): | Two species cannot coexist permanently in a community if their niches are identical. |
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. |
‘Realized niche’ of an organism can be best described as:
1. | the area a species can occupy in the face of exploitive competition |
2. | the habitat of a species within a community resulting from clumping |
3. | the habitat that exists in nature as opposed to the ideal |
4. | the life pattern that the organism actually assumes |
Assertion (A): | The human population is no longer growing exponentially but is still increasing rapidly. |
Reason (R): | Most countries of the world have undergone a demographic transition. |
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. |
A community of living organisms in conjunction with the nonliving components of their environment, interacting as a system is termed:
1. | ecosystem | 2. | species |
3. | biome | 4. | population |
Biosphere is:
1. | A component in the ecosystem |
2. | Composed of the plants present in the soil |
3. | Life in the outer space |
4. | Composed of all living organisms present on earth which interact with the physical environment |