Assertion (A): | Temperature is most important ecologically relevant environmental factor. |
Reason (R): | Temperature affects the kinetics of the enzymes. |
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. |
Assertion (A): | An overwhelming majority of animals and nearly all plants cannot maintain a constant internal environment. |
Reason (R): | These animals and plants are simply conformers. |
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. |
Assertion (A): | Ice fish is able to thrive in Antarctic water where the temperature is always below zero. |
Reason (R): | They have a special haemoglobin molecule that has very high affinity for oxygen. |
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. |
Assertion (A): | In every species, there are trade- offs between survival and reproductive traits. |
Reason (R): | Natural selection favors traits that improve an organism’s chances of survival and reproductive success. |
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. |
Desert lizards are able to keep their body temperature fairly constant by:
1. Physiological means
2. Anatomical means
3. Biochemical means
4. Behavioral means
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 |
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 |
Formation of tropical forests needs mean annual temperature and mean annual precipitation as:
1. 18 – 25 °C and 150 – 400 cm
2. 5 – 15 °C and 50 – 100 cm
3. 30 - 50°C and 100 – 150 cm
4. 5 – 15 °C and 100 – 200 cm
Which of the following forest plants controls the light conditions at the ground?
1. Lianas and climbers
2. Shrubs
3. Tall trees
4. Herbs