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Byju's Answer
Standard VIII
Biology
Flow of Energy
Select the fe...
Question

Select the feature which is common to both GFC and DFC.

A
Begins with the death of an organism
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B
Source of energy is not sun
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C
Size of organisms commonly increase trophic levels
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D
Ends at top carnivore level
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Solution

The correct option is D Ends at top carnivore level
Grazing food chain (GFC) begins with primary producers or plants and ends in carnivores (tertiary or top carnivores) whereas detritus food chain (DFC) begins with detritus or dead organic matter. Some of the organisms of DFC are prey to the GFC animals and it ends in carnivores. So, both end at top carnivore level.

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Similar questions
Q. How many of the following statements are incorrect?

(a) The consumers that feed on the herbivores can be called as primary carnivores

(b) The DFC begins with autotrophs

(c) GFC begins with dead organic matter

(d) Green plants occupy the first trophic level in an ecosystem
Q.

Choose the correct one from the following statements

1. Each organism occupies one trophic level in a food chain.

2. A trophic level in a food chain may be occupied by any of the producers, herbivores, carnivores or decomposers

3. Top consumers in a food chain generally feed on secondary consumers.

4. GFC and DFC are the common food chains and the latter is having maximum energy than the first


Q. Assertion (A): Both DFC and GFC are connected at some levels.

Reason (R): Some organisms of DFC are prey to the GFC animals.
Q. Study the following statements regarding food chains and select the correct ones.
(i) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation.
(ii) Removal of most of the carnivores resulted in an increased population of deers.
(iii) The length of food chains is generally limited to 3−4 trophic levels due to energy loss.
(iv) The length of food chains may vary from 2 to 8 trophic levels.
Q. Which of the following statements are correct with respect to food chains in an ecosystem?
I) Removal of 80% of tigers from an area will result in an increased growth of vegetation.
II) Removal of most of the carnivores will result in an increased population of deers.
III) The length of food chain is generally limited to 3 - 4 trophic levels in an ecosystem.
IV) Topmost trophic level possess the maximum energy.
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