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எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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Subjects
Science CBSE
Class 8
Conservation of plants and animals
The biodiversity of organisms and their conservation

16. Deforestation, causes and effect. Reforestation, extinct and endangered species

Exercise condition:

6 m.

Examine the statements below and choose the correct answer:

1. Assertion (A) - Destruction of forests causes shortage of forest products.

Reasoning (R) - Planting of trees in an area where the forests were destroyed is called as deforestation.

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

2. Assertion (A) - Paper is made from wood pulp produced from the wood of the forest trees.

Reasoning (R) - Processing of waste materials to make new materials which can be used again is called recycling.

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

3. Assertion (A) - Birds use sun as a guide during daytime and the stars during night.

Reasoning (R) - Birds migrate to escape the harsh cold weather.

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

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