Approximately how much of carbon is fixed in the biosphere through photosynthesis annually.

1. 4 × 1013 kg

2. 5.4 x 1015 kg

3. 6.4 x 1011 kg

4. 13 x 104 kg

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 88%
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Which of the following contribute to the atmospheric CO2?
1. Producers
2. Herbivores
3. Saprotrophs
4. All of the above

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 83%
From NCERT
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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

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 88%
From NCERT
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Which is the natural reservoir of Phosphorous?

1. Ocean

2. Fossils

3. Rock

4. Soil

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 91%
From NCERT
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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.

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 73%
From NCERT
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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.

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 83%
From NCERT
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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

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 80%
From NCERT
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The products of ecosystem processes are named as-

1. Environment services

2. Ecosystem services

3. Ecosystem products

4. Ecosystem taxes

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 85%
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Who put the price tags on nature’s life-support services?

1. Robert may

2. John Ray

3. Robert Constanza

4. Reiter

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 89%
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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

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 93%
From NCERT
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