Q. No.The amount of carbon dioxide in the atmosphere is:
1. increasing
2. decreasing
3. holding steady
4. fluctuating wildly
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% |
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%
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