Q. No.Approximately how much of carbon is fixed in the biosphere through photosynthesis annually.
1. 4 × kg
2. 5.4 x kg
3. 6.4 x kg
4. 13 x kg
Which of the following contribute to the atmospheric CO2?
1. Producers
2. Herbivores
3. Saprotrophs
4. All of the above
How could human activities affect the carbon cycle?
1. By rapid forestation
2. By massive burning of fossil fuel for energy and transport
3. By forest fire
4. More than one of the options given above are correct
How do herbivores and other animals obtain Phosphorous?
1. From soil in the dissolved form
2. From plants
3. From drinking water
4. Synthesized in the body.
The waste products and the dead organisms are decomposed by ____________releasing phosphorus.
1. parasitic bacteria
2. phosphate-solubilising bacteria
3. phosphate-solubilising fungi
4. Acidic soil.
Match the following:
| Column I | Column II | ||
| (i) | no respiratory release of element into the atmosphere | 1. | Carbon cycle |
| (ii) | atmospheric inputs of elements through rainfall are much smaller | 2. | Phosphorous cycle |
| (iii) | Gaseous exchanges of elements between organism and environment are negligible | ||
| (iv) | Human activities have significantly influenced the cycle | ||
| (v) | According to one estimate, 4×1013 kg of an element is fixed in the biosphere through photosynthesis annually |
1. 1- i and v; 2- ii, iii and iv
2. 1- iv and v; 2- i, ii and iii
3. 1- iv and iii; 2- i, ii and v
4. 1- i and ii, iii; 2- iv and iv
The products of ecosystem processes are named as-
1. Environment services
2. Ecosystem services
3. Ecosystem products
4. Ecosystem taxes
Who put the price tags on nature’s life-support services?
1. Robert may
2. John Ray
3. Robert Constanza
4. Reiter
How much price has been estimated by the researchers for the fundamental ecosystem services?
1. US $ 22 billion a year
2. US $ 33 trillion a year
3. US $ 40 trillion a year
4. US $ 52 million a year
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