The detritus food chain (DFC) begins with _________. It is made up of decomposers which are _________ organisms, mainly _________. They meet their energy and nutrient requirements by degrading _________.

1. detritus, heterotrophic, earthworm and dead organic matter.
2. dead organic matter, heterotrophic, fungi and bacteria, dead organic matter.
3. dead organic matter, autotrophic, fungi and plants, dead organic matter.
4. grass, heterotrophic, fungi and bacteria, dead organic matter.

Subtopic:  Energy Flow |
 72%
From NCERT
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What is the major conduit for energy flow in an aquatic ecosystem?

1. Grazing food chain

2. Detritus food chain

3. Sun

4. Hydrothermal vents

Subtopic:  Energy Flow |
 73%
From NCERT
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Identify the odd one out.

1. Cockroach

2. Crow

3. Humans

4. Goat

Subtopic:  Energy Flow |
 63%
From NCERT
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“Detritus food chain may be connected with the grazing food chain at some levels”.  This is evident from

i: Some of the organisms of DFC are prey to the GFC animals
ii: In a natural ecosystem, some animals like cockroaches, crows, etc., are omnivores.
iii: Some of the organisms of GFC are facultative decomposers

1. i and iii

2. i and ii

3. ii and iii

4. i only

Subtopic:  Energy Flow |
 69%
From NCERT
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What do you mean by a food web?

1. Group of food chains.

2. Food chains present in a particular area

3. Natural interconnection of food chains

4. Food chains formed by members of a genus

Subtopic:  Energy Flow |
 76%
From NCERT
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Based on the source of organism’s nutrition or food, they occupy a specific place in the food chain that is known as-

1. Strata

2. Trophic level

3. Sere

4. Chain level

Subtopic:  Energy Flow |
 88%
From NCERT
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What do you mean by the standing crop?

1. Crop in a field at a given time

2. Each trophic level has a certain mass of living material at a particular time.

3. Each trophic level has a certain mass of organic material at a particular time.

4. Top trophic level has a certain mass of organic material at a particular time.

Subtopic:  Energy Flow |
 69%
From NCERT
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The standing crop is measured as the-

1. Mass of living organisms in a unit area.

2. The number of living organisms in a unit area.

3. Calculated from the net primary productivity

4. Both 1 and 2.

Subtopic:  Energy Flow |
 62%
From NCERT
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Why does the number of trophic levels in the grazing food chain is restricted ?

1. As the transfer of energy follows 10 per cent law

2. So that food chain remains short

3. As there are few species the community

4. So that transfer of energy could be more efficient.

Subtopic:  Energy Flow |
 85%
From NCERT
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What does 10 per cent law say?

1. Less than 10 per cent of the energy is transferred to each trophic level from the lower trophic level
2. Only 10 per cent of the energy is transferred to each trophic level from the lower trophic level
3. Only 10 per cent of the energy is assimilated from the eaten food
4. Consumer gains 10 per cent mass of the consumed food
Subtopic:  Energy Flow |
 86%
From NCERT
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