Q. No.All the following relations are examples of commensalism except:
1. Sea anemone and clown fish
2. Cattle egret and grazing cattle
3. Barnacles growing on the back of whale
4. Cuscuta growing on hedge plants
1. Sea anemone and clown fish
2. Cattle egret and grazing cattle
3. Barnacles growing on the back of whale
4. Cuscuta growing on hedge plants
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Lichens represent an intimate mutualistic relationship between a fungus and:
| 1. | an algae | 2. | a cyanobacterium |
| 3. | a brown alga | 4. | either 1 or 2 |
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In mycorrhiza, the fungi help the plant in:
1. Synthesis of high energy carbohydrates
2. Absorption of essential nutrients from the soil
3. Nitrogen fixation
4. Biocontrol of pathogens
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To get pollinated by a bee, the Mediterranean Orchid, Ophrys, employs:
1. Sexual deceit
2. Pseudo-copulation
3. Reward in the form of nectar
4. Place for laying eggs
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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
| 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. |
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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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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