Q. No.The minimum requirement for an ecosystem to recycle nutrients present in it would be:
1.
producers
2.
producers and decomposers
3.
producers, primary consumers, and decomposers
4.
producers, primary consumers, secondary consumers, and decomposers
The best way to describe an ecosystem would be that they are:
| 1. | processors of energy and transformers of matter. |
| 2. | processors of matter and transformers of energy. |
| 3. | processors of matter and energy. |
| 4. | transformers of matter but not of energy. |
The amount of carbon dioxide in the atmosphere is:
1. increasing
2. decreasing
3. holding steady
4. fluctuating wildly
The ecosystem that can survive in the absence of the Sun would be:
| 1. | tropical rainforest | 2. | tundra |
| 3. | benthic ocean | 4. | desert |
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% |
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