Arrange these statements in corrent sequence of preparation of green manure.
(a) Green plants are decomposed in soil.
(b) Green plants are cultivated for preparing manure of crop plants parts are used.
(c) Plants are ploughed and mixed into the soil.
(d) After decomposition it becomes green manure.

Explanation

To arrange the statements in the correct sequence for the preparation of green manure, we can follow these steps:

1. **Statement (b)**: Green plants are cultivated for preparing manure of crop plants; parts are used.
- This is the first step because before any manure can be prepared, green plants need to be grown.

2. **Statement (c)**: Plants are ploughed and mixed into the soil.
- After the plants have grown, they need to be ploughed and mixed into the soil. This is the second step.

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