Which of the following could affect the rate of function of a pond?

1. The solar input

2. The cycle of temperature

3. Day-length

4. All of the above

Subtopic:  Components & Types of Ecosystems |
 94%
From NCERT
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The basic requirement for any ecosystem to function and sustain is

1. Enormous amount of water

2. Constant input of solar energy

3. Fertile soil

4. Oxygen

Subtopic:  Ecosystem Productivity |
 87%
From NCERT
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The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is called as-

1. Biomass production

2. Primary production

3. Secondary production

4. Assimilation

Subtopic:  Ecosystem Productivity |
 85%
From NCERT
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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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Which of the following statement is incorrect?

1. Gross primary productivity is the rate of production of organic matter during photosynthesis.

2. Net primary productivity plus respiration losses, is the gross primary productivity.

3. Gross primary productivity is defined for an ecosystem

4. Gross primary productivity is the available biomass for the consumption to heterotrophs.

Subtopic:  Ecosystem Productivity |
 70%
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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