Q. No.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 |
Which of the following ecological pyramids is generally inverted?
| 1. | Pyramid of biomass in a sea |
| 2. | Pyramid of numbers in grassland |
| 3. | Pyramid of energy |
| 4. | Pyramid of biomass in a forest |
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
2. about 50%
3. more than 80%
4. about 70%
| 1. | Detritus | 2. | Humus |
| 3. | Standing state | 4. | Standing crop |
| 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 |
Which one of the following is not a functional unit of an ecosystem?
1. Energy flow
2. Decomposition
3. Productivity
4. Stratification
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
Secondary productivity is the rate of formation of new organic matter by:
1. Parasite
2. Consumer
3. Decomposer
4. Producer
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