The minimum requirement for an ecosystem to recycle nutrients present in it would be:

1.  producers
2.  producers and decomposers
3.  producers, primary consumers, and decomposers
4.  producers, primary consumers, secondary consumers, and decomposers
Subtopic:  Decomposition |
 52%

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Which of the following is not a correct difference between a grazing food chain [GFC] and a detritus food chain [DFC]?

 

GFC

DFC

1.

Major conduit of energy flow in aquatic ecosystem

Major conduit of energy flow in terrestrial ecosystem

2.

Much larger energy flows through it

Much smaller energy flows through it

3.

Begins with producers

Begins with dead organic matter

4.

Energy for this food chain comes from the sun

Energy for this food chain comes from the remains of detritus

Subtopic:  Energy Flow |
 68%

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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): There is no limitation on the number of trophic levels in a detritus food chain.
Reason (R): The transfer of energy between successive trophic levels in a detritus food chain does not follow the 10% rule.

In the light of the above statements, choose the most appropriate answer from the options given below :

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Energy Flow |
From NCERT

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The nutrients in an ecosystem are:

1.  continuously lost from an ecosystem
2.  needed as a continuous supply from the outside
3.  recycled time and again indefinitely
4.  continuously synthesized by physical forces
Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 80%

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Given below is a hypothetical pyramid of energy. The amount of energy left at the level of secondary consumers would approximately be:
 

1. 10000 J 2. 1000 J
3. 100 J 4. 50 J
Subtopic:  Ecological Pyramids |
 69%
From NCERT

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Identify the incorrectly matched pair:

1.

Vertical distribution of different species occupying different levels

Stratification

2.

Mass of living material at a particular time at each trophic level

Standing crop

3.

Rate of formation of new organic matter by consumers

Net primary productivity

4.

The rate of production of organic matter during photosynthesis

Gross primary productivity

Subtopic:  Ecosystem Productivity |
 88%
From NCERT

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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A):  Most of an ecosystem’s production is eventually consumed by detritivores and decomposers.
Reason (R):  Energy is said to flow through, not cycle within, ecosystems.
 In the light of the above statements, choose the most appropriate answer from the options given below :
1.  Both (A) and (R) are true and (R) is the correct explanation of (A).
2.  Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.  (A) is true but (R) is false.
4.  Both (A) and (R) are false.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Energy Flow |

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An inverted pyramid of biomass can be found in which ecosystem?

1.Forest2.Marine
3.Grassland4.Tundra

Subtopic:  Ecological Pyramids |
 81%
From NCERT

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Consider the following statements:
The rate of decomposition is high if: 

I:  The detritus is rich in lignin and chitin.
II:  The detritus is rich in nitrogen and sugars.
III:  The environmental conditions are warm and moist.

Which of the above statements are true?

1. I and II only 2. I and III only
3. II and III only 4. I, II, and III
Subtopic:  Decomposition |
 85%
From NCERT

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Converting nitrate to nitrogen gas by anaerobes like Pseudomonas is:

1.nitrogen fixation2.ammonification
3.denitrification4.eutrophication

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 70%

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