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Subjects
Science CBSE
Class 10
Our environment
Ecosystem and energy flow

21. Producers, ozone layer depletion and food chain

Exercise condition:

6 m.

Examine the statements below and choose the correct answer:

1.

Assertion (A):	Food chains usually consist of three or four trophic levels.
Reasoning (R):	After four trophic levels, there is very little useable energy left.

Both A and R are true but R is NOT the correct explanation of A
Both A and R are false
A is false but R is true
Both A and R are true and R is the correct explanation of A
A is true but R is false

2.

Assertion (A):	Green plants are also called transducers.
Reasoning (R):	Producers trap the solar energy and changes it to chemical energy.

Both A and R are true and R is the correct explanation of A
A is true but R is false
A is false but R is true
Both A and R are false
Both A and R are true but R is NOT the correct explanation of A

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