Q. No.Decomposers like fungi and bacteria are :
i.
Autotrophs
ii.
Heterotrophs
iii.
Saptrotrophs
iv.
Chemo-autotrophs
Choose the correct answer :
1. i and ii 2. i and iv 3. ii and iii 4. i and iii
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The process of mineralization by micro-organisms helps in the release of:
| 1. | Inorganic nutrients from humus |
| 2. | Both organic and inorganic nutrients from detritus |
| 3. | Organic nutrients from humus |
| 4. | Inorganic nutrients from detritus and formation of humus |
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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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An inverted pyramid of biomass can be found in which ecosystem?
| 1. | Forest | 2. | Marine |
| 3. | Grassland | 4. | Tundra |
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Which of the following ecosystems is most productive in terms of net primary production?
| 1. | Deserts | 2. | Tropical rainforests |
| 3. | Oceans | 4. | Estuaries |
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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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Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis?
| 1. | Less than 1% | 2. | 2-10 % |
| 3. | 30 % | 4. | 50 % |
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Among the following, where do you think the process of decomposition would be the fastest?
| 1. | Tropical rain forest | 2. | Antarctic |
| 3. | Dry arid region | 4. | Alpine region |
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How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores?
| 1. | 1% | 2. | 10% |
| 3. | 40% | 4. | 90% |
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