Question

C. Choose the correct option.
1. The presence of water vapour and carbon dioxide in the atmosphere
a. makes respiration easy
b. helps trees to prepare their food
c. helps in maintaining the temperature on Earth
d. helps in maintaining the optimum is in oxygen level

2. Nitrogen which is predominantly present in the atmosphere
a. is needed by animals
b. is crucial for breathing
c. is needed for the photosynthesis
d. is needed by plants


3 The stratosphere
a. has dense clouds
b. does not experience any violent weather changes
c. does not have the ozone layer
d. has dust and water vapours


4. The upper most layer of the atmosphere is
a. the mesosphere
b. the thermosphere
c. the troposphere
d. the exosphere ​

Answer 1

Answer:

1. (d) helps trees to prepare their food

2. (d) is needed by plants

3. (b) does not experience any violent weather changes

4. (d) the exosphere

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Answer 2

Answer:

1.C)Helps in maintaining temperature on Earth

2. D)Needed by Plants

3. D)Has dust and water vapours

4. D)Exosphere

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