Q. No.Most organic carbon on Earth is found in:
1. Atmosphere
2. Oceans
3. Biomass
4. Sedimentary rocks
1. Atmosphere
2. Oceans
3. Biomass
4. Sedimentary rocks
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The generation of biomass of heterotrophic (consumer) organisms in a system is termed:
| 1. | biogeochemical cycles | 2. | net primary productivity |
| 3. | gross primary productivity | 4. | secondary productivity |
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In an open ocean, the pyramid of biomass is often inverted. How can this support higher trophic levels?
| 1. | The food produced by primary producers is of high quality |
| 2. | The primary producers grow and reproduce at high rates |
| 3. | Primary producers are very abundant. |
| 4. | The predators at higher trophic levels are very efficient |
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Converting nitrate to nitrogen gas by anaerobes like Pseudomonas is:
| 1. | nitrogen fixation | 2. | ammonification |
| 3. | denitrification | 4. | eutrophication |
The highest net primary productivity per square meter is of:
| 1. | open ocean | 2. | boreal forest |
| 3. | tropical rainforest | 4. | temperate forest |
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A secondary consumer amongst the following is:
| 1. | a carnivore | 2. | a herbivore |
| 3. | a plant | 4. | apex predator |
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The productivity in an aquatic ecosystem is least likely to be limited by:
| 1. | nitrogen | 2. | carbon |
| 3. | phosphorus | 4. | iron |
In an ecosystem which of the following can never by inverted?
1. pyramid of numbers
2. pyramid of energy
3. pyramid of biomass
4. all can be inverted
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In boreal forests soils contain large amounts of carbon but the primary production is low compared to other types of forests. This can be explained by:
1. high rates of herbivory
2. slow weathering of rocks
3. periodic fires in the forests
4. restricted decomposition
The amount of water required for a crop plant to produce one kilogram of food is approximately:
1. 1 Kg
2. 10 Kg
3. 100 Kg
4. 1000 Kg
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