The nutrients in an ecosystem are:
1. | continuously lost from an ecosystem |
2. | needed as a continuous supply from the outside |
3. | recycled time and again indefinitely |
4. | continuously synthesized by physical forces |
Converting nitrate to nitrogen gas by anaerobes like Pseudomonas is:
1. | nitrogen fixation | 2. | ammonification |
3. | denitrification | 4. | eutrophication |
Which of the following is an ecosystem service provided by a natural ecosystem?
1. | Cycling of nutrients |
2. | Prevention of soil erosion |
3. | Pollutant absorption and reduction of the threat of global warming |
4. | All of the above |
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