Question

The seed coat is formed from which of the following structure(s)
A)Integuments
B)Endosperm
C)Ovary
D)Residues of sepals

Answer 1

The protective layer enclosing the seed is called the seed coat. After fertilisation, the ovule becomes the seed. The outer surface of the ovule turns into the seed coat. It acts like a first line of defence in protecting the seeds from external environment.

Complete answer:
Seed coat is the protective layer around the seed which protects the interior of the seeds from the adverse environmental conditions. It also protects the interior of the seed (embryo) from drying out or affected by water or insects.
Fertilisation: The pollen grains reach the stigma of the flowers through agents like winds, water or animals. Then the pollen tube is generated which helps the male gamete or the anther to reach the ovary where it fuses with the female gamete and forms zygote.
Post- fertilisation-After the fertilisation takes place, flowers develop into a fruit.

The ovary becomes the fruit and the ovule is converted into seeds.
The integuments become the seed coat.
The sepals and petals wither off.

The endosperm is the tissue inside the seed which provides nutrition to the developing embryo. It is formed as a result of triple fusion.

Hence, the correct answer is option (A)

Note: The integuments are the outer layer of the ovule. The gymnosperms have one integument whereas the angiosperm have two. The outer integument is called the testa whereas the inner is called the tegmen. The seed coat of monocot plants are fused together and form pericarp.