Question

C. State whether True (T) or False (F):
1. Air contains only 2% of nitrogen.( )
2. The volume of oxygen decreases with increase in altitude.( )
3. Plants do not need oxygen.( )
(4)Carbon dioxide supports combustion.( )
5. Green plants use oxygen for preparing their food.( )​

Answer 1

Answer:

1. F

2.T

3.F

4.F

5.F

Explanation:

1. air contains 78% of nitrogen

2.the volume of oxygen decreases with increase in height as when we go in the mountain the oxygen decreases

3. plants need oxygen during the night time

4. oxygen's supports combustion

5. green plants use carbon dioxide for preparing food during day time

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Answer 2

Explanation:

1. False.

2.True

3. False

4.False

5. False

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