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 |
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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 |
The biome characterized by a mean annual temperature between 5C and 22C and mean annual precipitation between 5 cm and 50 cm is:
1. Desert
2. Arctic and alpine tundra
3. Temperate forest
4. Grassland
Many freshwater animals cannot live for long in sea water and vice versa because of:
1. Buoyancy related problems
2. Lack of impermeable skins
3. Thermolabile enzymes
4. Osmotic considerations
Evolutionary biologists believe that “success” of mammals is largely due to their ability to:
1. Produce a large number of progeny
2. Live for a longer life span
3. Maintain a constant body temperature
4. Nurture young ones for longer periods
Kangaroo rat is capable of meeting all its water requirements through:
1. Storing water when available
2. Dry seeds and foliage
3. Metabolic water
4. Burrowing deep to get water
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. |