Question

Tegmen develops from
A. Outer integument
B. Inner integument
C. Chalaza
D. Funicle

Answer 1

Hint:- Tegmen is present in the seeds. Seeds are produced through the fertilization of ovules by the pollen. A seed has two major parts, the seed coat, and an embryo. The zygote gives rise to the embryo whereas the seed coat is developed from the integument of the ovule.

Complete step-by-step solution:-
The seed coat is the outermost covering layer of a seed which is composed of two layers or integuments. The outer integument gives rise to the outer layer known as testa, and the inner integument gives rise to the inner layer known as tegmen. Testa is hard and leathery which protects the seed from the harsh environment. Tegmen is a delicate layer of seed which also serves as its protective unit.
Thus the correct option is (B) Inner Integument.

Additional information:- The embryo has one or two cotyledons, a radicle, a plumule, and an embryonal axis in it. The seeds having one cotyledon are called monocotyledonous seeds, whereas the seeds having two cotyledons are called dicotyledonous seeds. Cotyledons are attached to the embryonal axis and also serve as a source of the nutrient. The plumule grows and gives rise to shoot part of the plant after germination, whereas the radicle grows into the primary root.

Note:- Funicle and chalaza are also the components of the ovule. Funicle is a stalk-like structure present in the seed which helps in attachment of ovule to the placenta and of the ovary to the pericarp. Chalaza is the base of the ovule from where the integuments originate. It is a swollen part present at the base of the nucellus. It is a place where integument joins with the nucleus.