Q. No.If 20 J of energy is trapped at the producer level, then how much energy will be available to peacocks as food in the following chain?
Plant → mice → snake → peacock
1.
0.02 J
2.
0.002 J
3.
0.2 J
4.
0.0002 J
Plant → mice → snake → peacock
Which one of the following processes during decomposition is correctly described?
| 1. | Humanification-Leads to the accumulation of a dark-coloured substance in humans which undergoes microbial action at a very fast rate |
| 2. | Catabolism-Last step decomposition under fully anaerobic condition |
| 3. | Leaching-Water soluble inorganic nutrients rise to the top layers of the soil |
| 4. | Fragmentation-Carried out by organisms such as earthworms |
Secondary productivity is the rate of formation of new organic matter by:
1. Parasite
2. Consumer
3. Decomposer
4. Producer
Pheretima and its close relatives derive nourishment from:
1. Sugarcane roots
2. Decaying fallen leaves and soil organic matter
3. Soil insects
4. Small pieces of fresh fallen leaves of maize
Which one of the following is not a gaseous biogeochemical cycle in the ecosystem?
1. Sulphur cycle
2. Phosphorus cycle
3. Nitrogen cycle
4. Carbon cycle
Which one of the following is not a functional unit of an ecosystem?
1. Energy flow
2. Decomposition
3. Productivity
4. Stratification
Which one of the following statements is correct for secondary succession?
| 1. | It occurs on a deforested site |
| 2. | It follows primary succession |
| 3. | It is similar to primary succession except that it has a relatively slow pace |
| 4. | All of the above |
| 1. | It shows the energy content of different trophic-level organisms |
| 2. | It is inverted in shape |
| 3. | It is upright in shape |
| 4. | Its base is broad |
| 1. | Detritus | 2. | Humus |
| 3. | Standing state | 4. | Standing crop |
2. about 50%
3. more than 80%
4. about 70%
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