Primary production is expressed in terms of-

1. Grams

2. Grams/year

3. Gram/m2

4. Gram/m2/year

Subtopic:  Ecosystem Productivity |
 63%
From NCERT
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What do you mean by Productivity?
1. Rate of biomass production
2. Amount of biomass production
3. Biomass produced in an area
4. Biomass produced in a time period

Subtopic:  Ecosystem Productivity |
 74%
From NCERT
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Secondary productivity is defined with respect to-

1. Producers

2. Consumers

3. Ratio of producers and consumers

4. Trophic level

Subtopic:  Ecosystem Productivity |
 91%
From NCERT
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Primary productivity of an terrestrial ecosystem depends upon

1. Photosynthetic capacity of plants.

2. A variety of environmental factors,

3. Availability of nutrients

4. All of the above.

Subtopic:  Ecosystem Productivity |
 95%
From NCERT
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What is the annual net primary productivity of the whole biosphere

1. 160 billion tons

2. 170 billion tons

3. 177 billion tons

4. 190 billion tons

Subtopic:  Ecosystem Productivity |
 92%
From NCERT
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Which of the following contributes the maximum to the net primary productivity?

1. Ocean ecosystem

2. Land ecosystem

3. Pond ecosystem

4. Man-made ecosystem

Subtopic:  Ecosystem Productivity |
 76%
From NCERT
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Why do we call the earthworm as the farmer’s friend?

1. It eats the pests.
2. It prevents the growth of weeds.
3. It makes the soil fertile by burrowing.
4. It helps in the breakdown of complex organic matter as well as in loosening of the soil.
Subtopic:  Decomposition |
 90%
From NCERT
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Which of the following is not a step in the process of decomposition?

1. Fragmentation

2. Leaching

3. Anabolism

4. Humification.

Subtopic:  Decomposition |
 95%
From NCERT
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Which of the following statement is correct?

1. Dead plant and animals remains, including fecal matter, constitute detritus,

2. Detritus is the product of decomposition.

3. Breakdown of complex inorganic matter into organic substances like CO₂ and nutrients is called as decomposition.

4. Decomposition is a single step process.

Subtopic:  Decomposition |
 74%
From NCERT
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What is the process by which Detritivores break down the detritus into smaller particles.?

1. Degradation

2. Decomposition

3. Fragmentation

4. Leaching

Subtopic:  Decomposition |
 83%
From NCERT
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