Arvind always keeps the doors and windows of his room closed. But his grandfather keeps the windows of his room open to let the fresh air come in the room.
Answer the following questions based on the above information :
(i) Which one is healthy, Arvind or his grandfather? Give the reason also.
(ii) What should a person do to remove the stale air from his room if there is no window in the room?
(iii) Which type of values are displayed by Arvind's grandfather?
 

Choose the correct word from the list given below:

List: nitrogen, carbon dioxide, wind, oxygen, earth.

Plants need _____ to make their food.

Choose the correct word from the list given below:

List: nitrogen, carbon dioxide, wind, oxygen, earth.

Choose the correct word from the list given below:

List: nitrogen, carbon dioxide, wind, oxygen, earth.

The moving air is called _____.

The statement given below is incorrect. Write correct statement.

Carbon dioxide is given out by the plants during photosynthesis.

The statement given below is incorrect. Write correct statement.

Smoke consists of black particles of soil, suspended in air.