Net primary productivity is the gross primary productivity minus

1. that which is consumed by herbivores

2. that which is consumed by producer in metabolism

3. secondary productivity 

4. loss due to mortality

Subtopic:  Ecosystem Productivity |
 73%
From NCERT
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The major reservoir for phosphorous is 

(1) Aquifers

(2) Soil and rocks

(3) The atmosphere

(4) Clouds

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 94%
From NCERT
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Which of the following pyramids can never be inverted in a natural ecosystem?

1. pyramid of numbers

2. pyramid of energy

3. pyramid of biomass

4. all can be inverted 

Subtopic:  Ecological Pyramids |
 87%
From NCERT
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The earth is an open system with respect to

1. organisms

2. chemicals

3. energy 

4. all of the above

Subtopic:  Energy Flow |
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Plants capture approximately __________________ of the sun's energy while other trophics levels capture about _________________ of the energy available to them in their food.

1. 1%, 10%

2. 10%, 60%

3. 10%, 1%

4. 60%, 10%

Subtopic:  Energy Flow |
 60%
From NCERT
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Which trophic level is incorrectly defined?
1. Carnivores- secondary or tertiary consumer
2. Decomposer- microbial heterotrophs
3. Herbivores - primary consumer
4. Omnivores - Molds, yeast and mushrooms

Subtopic:  Energy Flow |
 82%
From NCERT
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Nitrogen gas makes up nearly 80% of Earth's atmosphere, yet nitrogen is often a limiting factor for plant growth. Why ?
1. The atmospheric form of nitrogen cannot be used by plants.
2. Nitrifying bacteria remove usable nitrogen from the soil more repidly than plants can absorb it.
3. Atmospheric nitrogen dissolves readily in the soil but is washed out with every rainfall.
4. Plants must absorb nitrogen through their roots, which are not in contact with the atmosphere.

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 65%
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In general, the biomass in an ecosystem will be greatest at the trophic level comprising.

1. secondary consumers

2. primary consumers

3. producers

4. tertiary consumers

Subtopic:  Ecological Pyramids |
 75%
From NCERT
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Consider the following two statements:

l. The annual net primary productivity of the whole biosphere is approximately 170 billion tons (dry weight) of organic matter.
ll. Majority of this is contributed by the oceans as they occupy larger area of earth.

1. Both l and ll are correct and ll explains l

2. Both l and ll are correct but ll does not explain l

3. l is correct but ll is incorrect

4. l is incorrect but ll is correct

Subtopic:  Ecosystem Productivity |
 72%
From NCERT
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What percent of energy in the sunlight availble to the primary producers is converted by them into net primary productivity ?
1. 1
2. 2
3. 5
4. 10 

Subtopic:  Energy Flow |
 56%
From NCERT
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