Q. No.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 |
Which of the following type of ecosystem is expected in an area where evaporation exceeds precipitation, and mean annual rainfall is below 100 mm?
1. Grassland
2. Shrubby forest
3. Desert
4. Mangrove
The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called?
| 1. | Pelagic zone | 2. | Benthic zone |
| 3. | Lentic zone | 4. | Littoral zone |
Which of the following is an ecosystem service provided by a natural ecosystem?
| 1. | Cycling of nutrients |
| 2. | Prevention of soil erosion |
| 3. | Pollutant absorption and reduction of the threat of global warming |
| 4. | All of the above |
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