Q. No.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
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 |
A secondary consumer amongst the following is:
| 1. | a carnivore | 2. | a herbivore |
| 3. | a plant | 4. | apex predator |
The productivity in an aquatic ecosystem is least likely to be limited by:
| 1. | nitrogen | 2. | carbon |
| 3. | phosphorus | 4. | iron |
A herbivore eats 4,000 J of plant material. 2200 J is indigestible and is eliminated as feces. 1,600 J are used in cellular respiration. What is the approximate production efficiency of this animal?
| 1. | 1% | 2. | 5% |
| 3. | 10% | 4. | 50% |
Choose the correct chronological order [lowest to highest] of the production efficiency of the given animals:
| 1. | mammals, fish, insects | 2. | insects, fish, mammals |
| 3. | fish, insects, mammals | 4. | insects, mammals, fish |
What is the percent of atmospheric carbon dioxide that is fixed annually by photosynthesis?
1. 70%
2. 36%
3. 10%
4. 1%
Top predators are especially endangered primarily because:
1. The population size would be small
2. Their food requirement is huge
3. They are more prone to diseases
4. They are usually outcompeted by prey
A primary consumer amongst the following would be:
| 1. | an autotroph | 2. | a horse parasite |
| 3. | an oak tree parasite | 4. | a wolf |
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