Q. No.Carefully observe the shape of the age-sex population pyramid for four countries. Which of them most likely represents the pyramid for Indian population?
1.
2.
3.
4.
The growth rate of a natural population will exactly be zero when:
| 1. | The population size and carrying capacity are exactly equal. |
| 2. | The population size nears the carrying capacity of the habitat. |
| 3. | The ratio of population size and carrying capacity is zero. |
| 4. | Mortality is greater than natality. |
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
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Which of the following forest plants controls the light conditions at the ground?
1. Lianas and climbers
2. Shrubs
3. Tall trees
4. Herbs
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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
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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
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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
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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 |
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Desert lizards are able to keep their body temperature fairly constant by:
1. Physiological means
2. Anatomical means
3. Biochemical means
4. Behavioral means
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| 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. |
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