The major reservoir for phosphorous is 

(1) Aquifers

(2) Soil and rocks

(3) The atmosphere

(4) Clouds

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 98%
From NCERT
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The accumulation of herbivore biomass in an ecosystem is an example of 
1. biogeochemical cycles
2. transpiration
3. net primary productivity
4. secondary productivity

Subtopic:  Ecosystem Productivity |
 61%
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 |
 94%
From NCERT
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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 |
 70%
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 |
 87%
From NCERT
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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 |
 80%
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 |
 76%
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 |
 67%
From NCERT
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Both hydrach and xerarch successions:

1. Take same time

2. Have similar sere

3. Lead to mesic conditions

4. Have same pioneer species

Subtopic:  Ecological Succession (OLD NCERT) |
 96%
From NCERT
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The second trophic level in a lake is:
1. Phytoplankton
2. Zooplankton
3. Benthos
4. Fishes

Subtopic:  Energy Flow |
 92%
From NCERT
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