Q. No.The function of a reservoir of nutrient cycle is to:
1. synthesize minerals
2. transfer minerals to other ecosystems
3. meet any deficit
4. destroy the unwanted minerals
1. synthesize minerals
2. transfer minerals to other ecosystems
3. meet any deficit
4. destroy the unwanted minerals
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The maximum percent of total global carbon is found:
1. in fossil fuels
2. in atmosphere
3. dissolved in oceans
4. in biomass of microbes
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Regarding phosphorus cycle:
| I: | There is no respiratory release of phosphorus into atmosphere |
| II: | Atmospheric inputs of phosphorus through rainfall of phosphorus is small |
1. Only I is true.
2. Only II is true.
3. Both I and II are true.
4. Both I and II are false.
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Identify the incorrectly matched pair:
|
Ecosystem service |
Cost out of total [%] |
|
|
1. |
Soil formation |
50 |
|
2. |
Nutrient cycling |
10 |
|
3. |
Climate regulation |
6 |
|
4. |
Habitat for wildlife |
3 |
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Identify the incorrectly matched pair:
1. Carnivores -- secondary or tertiary consumer
2. Decomposers -- microbial heterotrophs
3. Herbivores -- primary consumer
4. Omnivores -- molds, yeasts and mushrooms
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Productivity is the rate of production of biomass expressed in terms of :
i.
ii.
iii.
iv.
| 1. | ii | 2. | iii |
| 3. | ii and iv | 4. | i and iii |
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Pyramid of numbers is :
1. Always upright
2. Always inverted
3. Either upright or inverted
4. Neither upright nor inverted
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During the process of ecological succession, the changes that take place in communities are :
1. Orderly and sequential
2. Random
3. Very quick
4. Not influenced by the physical environment
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Climax community is in a state of :
1. Non-equilibrium
2. Equilibrium
3. Disorder
4. Constant change
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Net primary productivity is the gross primary productivity minus:
| 1. | that which is consumed by herbivores |
| 2. | that which is consumed by the producer in metabolism |
| 3. | secondary productivity |
| 4. | loss due to mortality |
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