Q. No.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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Not all parasitism involves feeding on the body of the host. The exception is:
1. ectoparasitism
2. endoparasitism
3. parasitoids
4. brood parasitism
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A feature of ‘r’ strategists would be:
| 1. | few offspring | 2. | little parental care |
| 3. | sigmoid growth curves | 4. | a longer generation time |
The maximum population size of the species that the environment can sustain indefinitely is called as:
| 1. | biotic potential | 2. | natality |
| 3. | environmental resistance | 4. | carrying capacity |
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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 |
The threat of extinction will be highest for:
| 1. | a very small population in an unstable environment |
| 2. | a moderate-sized population of r strategists |
| 3. | a large population with lots of genetic variabilities |
| 4. | a moderate sized population in a stable environment |
During logistic growth, the sigmoid curve will level off when:
1. the population stops reproducing
2. the population starts reproducing asexually
3. the population reaches the environmental carrying capacity
4. sigmoid growth curves never levels off
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