Assertion :The two cotyledons in seed are the embryonic leaves.
Reason :The embryo contains radicle and plumule.

A. In pulses, each seed encloses an embryo which can be examined after removing the seed coats. The bulk of embryo consists of two large, white and kidney shaped cotyledons( or seed leaves). They store reserve food material in the form of carbohydrates and proteins to provide nourishment to embryonal axis at the time of germination and growth of young seedling.

B. The micropylar end of embryonal axis is rod- shaped and slightly bulged. It is called radicle( embryonic root). The other side of embryonal axis lies in between the two cotyledons. It is called plumule (the shoot tip). The shoot tip remains protected by two small, folded leaves. So, the correct answer is 'Both assertion and reason are correct but reason is not the correct explaination for assertion'.