Question

The point of attachment of the stalk with the seed is
A. Hilum
B. Micropyle
C. Tegmen
D. Plumule

Answer 1

A seed has two parts that are radical that further grow into the root part and plumule which further grows into the shoot part. This structure can also be a nucleus of a starch grain; the point around which layers of starch are deposited.

Complete answer: The hilum is defined to be the point of attachment of the funicle to the seed. It is a scar which indicates the attachment. On beans, it seems to be an eye.
a) Micropyle - It is defined to be a small opening on the ovule surface through which the pollen tube penetrates out. It provides the pathway for water transport in a germinating seed.
b) Tegmen - It is defined to be the inner integument or protective layer of the seed, which is the layer next to testa. It provides protection to the seed.
c) Plumule - It is a part of the seed which grows up to be the shoot of the plant. It bears leaves, stem, fruits, flowers in it.
So, option A is the correct answer.

Note: Hilum regulates the effect of humidity on the seeds. When there is low humidity, the hilum opens leading to the drying out of the seed while when the humidity is high, it closes interrupting in the absorption of moisture from the atmosphere. The hilum is the opening and closing pathway for the accommodation of nutrients and other necessary factors of the seeds.