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 functional unit of an ecosystem?
1. Energy flow
2. Decomposition
3. Productivity
4. Stratification
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 |
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 |