Q. No.A species that has a disproportionately large effect on its natural environment relative to its abundance is called as:
1. keystone species 2. niche 3. competitor 4. predator
Competitors can coexist indefinitely only by:
| 1. | niche differentiation | 2. | contest competition |
| 3. | interference competition | 4. | scramble competition |
Population size is unlikely to be limited by:
| 1. | predation | 2. | commensalism |
| 3. | competition | 4. | brood parasitism |
Rapid loss of nutrients from terrestrial ecosystems is not caused by:
| 1. | clear-cutting native forest | 2. | early seral stages |
| 3. | climax communities | 4. | low diversity |
Semelparous organisms:
1. produce young only late in life
2. produce a large batch of young and die
3. produce young over most of their life
4. produce a single offspring near the end of their reproductive potential
The consequences of high population density of a population will include all except:
1. toxic waste accumulation
2. an increase in mortality
3. ignorance of overabundant prey by the predators
4. a reduction in reproduction
Study the four statements (a-d) given below and select the two correct ones out of them:
| (a) | A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers |
| (b) | Predator starfish pisaster helps in maintaining species diversity of some invertebrates |
| (c) | Predators ultimately lead to the extinction of prey species |
| (d) | Production of chemicals such as nicotine, strychnine by the plants are metabolic disorders |
The two correct statements are:
| 1. | (c) and (d) | 2. | (a) and (d) |
| 3. | (a) and (b) | 4. | (b) and (c) |
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The endosymbiosis between early eukaryotes and the prokaryote lineage would be an example of:
| 1. | Commensalism | 2. | Mutualism |
| 3. | Parasitism | 4. | Competition |
Consider the following statements (A)-(D) each with one or two blanks.
| A. | Bears go into __(i)__ during winter to __(ii)__ cold weather |
| B. | A conical age pyramid with a broad base represents __(iii)__ human population |
| C. | A wasp pollinating a fig flower is an example of __(iv)___ |
| D. | An area with high levels of species richness is known as __(v)___ |
| 1. | (ii) - Stable (iv) Commensalism, (v) Marsh |
| 2. | (i) - Aestivation, (v) - Escape, (iii) - Stable, (iv) - Mutualism |
| 3. | (iii) - Expanding, (iv) - Commensalism, (v) Biodiversity park |
| 4. | (i)- Hibernation, (ii) - Escape, (iii) - Expanding, (v) Hot spot |
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