Question

Many times, you would have noticed, some small plants are kept in small bags in a nursery. Can you give reason of doing this

Answer 1

The bag is used for the plants to trap the warmth. New or young plants require a considerable measure of warmth and dampness to grow a decent solid root structure. It is also known as mini greenhouse effect. 
The point is to shield the plants from the external condition and pamper them with appropriate development conditions and when these plants have developed adequately they would be grown in field conditions.

Answer 2

Explanation:

It is also known as mini greenhouse effect. The point is to shield the plants from the external condition and pamper them with appropriate development conditions and when these plants have developed adequately they would be grown in field conditions.