Question

What are the functions of the following in a seed? <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> [Review Questions - Pg No.54 - LAT - 1]

• Seed coat
• Micropyle
• Cotyledons
• Radicle
• Plumule

Answer 1

Answer

Seed coat

• The outermost layer of the seed is known as a seed coat.
• The outer part of the seed coat is known as Tesla
• Testa is a brownish hard layer that protects the seed from injuries, insects, bacterial and fungal attacks.
• The inner part is a thin layer known as Tegman, it also protects the seed.

Micropyle

• A small pore situated near the hilum is called the micropyle.
• It is the opening point from which the pollen tubes enter the ovule.
• The water in the seed is mostly absorbed with the help of the micropyle
• For the growing embryo, it also helps in the diffusion of respiratory gases.

Cotyledons

• The cotyledons are also known as seed leaves.
• The cotyledons store the food in them
• The food absorbed in the cotyledons is rich in starch.
• The outer layer of the cotyledon is rich in protein.

Radicle

• It is the part of the embryo.
• The radicle later converts into the roots.

Plumule

• It is the part of the embryo in the seed.
• The plumule later becomes the shoot.