Most animals that are in deep oceanic water are?
1. Primary consumers
2. Secondary consumers
3. Tertiary consumers
4. Detritivores
The vertical distribution of different species occupying different levels in a biotic community is known as:
The mass of living material at a tropic level at a particular time is called:
In an ecosystem, the rate of production of organic matter during photosynthesis is termed as:
1. net primary productivity
2. gross primary productivity
3. secondary productivity
4. net productivity
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 |
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 |