Q. No.Which of the following ecosystems is most productive in terms of net primary production?
1. Deserts 2. Tropical rainforests 3. Oceans 4. Estuaries
Pyramid of numbers is :
1. Always upright
2. Always inverted
3. Either upright or inverted
4. Neither upright nor inverted
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 % |
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 |
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% |
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
Climax community is in a state of :
1. Non-equilibrium
2. Equilibrium
3. Disorder
4. Constant change
Among the following bio-geo-chemical cycles, which one does not have losses due to respiration?
1. Phosphorus
2. Nitrogen
3. Sulphur
4. All of the above
The sequence of communities of primary succession in water is :
| 1. | Phytoplankton, sedges, free-floating hydrophytes, rooted hydrophytes, grasses, and trees. |
| 2. | Phytoplankton, free-floating hydrophytes, rooted hydrophytes, sedges, grasses, and trees. |
| 3. | Free-floating hydrophytes, sedges, phytoplankton, rooted hydrophytes, grasses, and trees. |
| 4. | Phytoplankton, rooted submerged hydrophytes, floating hydrophytes, reed swamp, sedges, meadow, and trees. |
If the carbon atoms fixed by producers already have passed through three species, the trophic level of the last species would be
| 1. | Scavenger | 2. | Tertiary producer |
| 3. | Tertiary consumer | 4. | Secondary consumer |
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