Question

B. Fill in the blanks :
1.________and________ are the two main constituents.
2. _________is the second most plentiful gas present in the air.
3. Green plants take in__________ to make their own food.
4. The_________ layer is most suitable for flying of aircrafts.
5. The_________ layer is helpful for radio communication.​

Answer 1

Answer:

2 Nitrogen

4. Stratosphere

5. Ionosphere