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 |
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 |
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 |
Nitrogen is often a limiting nutrient in terrestrial ecosystems because:
1. | the percentage of nitrogen in the atmosphere is low |
2. | atmospheric nitrogen is primarily in the stratosphere |
3. | dinitrogen cannot be used directly by the organisms |
4. | there are regional fluctuations in nitrogen levels in the atmosphere |
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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