Question

The inner thin, membranous whitish integument seen in dicotyledonous seed is known as __________.

Answer 1

A typical non-endospermic dicot seed is made up of seed coat and embryo. The seed coat consists of two layers that may be united or free, the outer layer, which is hard and made of thick walled cells is called testa and the inner thin membranous layer is called tegmen.

Hence, the answer is $tegmen$.