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 |
The biomass available for consumption by the herbivores and the decomposers is called:
1. net primary productivity
2. secondary productivity
3. standing crop
4. gross primary productivity
Which one of the following is one of the characteristics of a biological community?
1. | Stratification | 2. | Natality |
3. | Mortality | 4. | Sex-ratio |
1. | grasslands | 2. | agro-ecosystems |
3. | oceans | 4. | forests |
Which one of the following is not used for the construction of ecological pyramids?
1. | Dry weight | 2. | Number of individuals |
3. | Rate of energy | 4. | Fresh weight |