Question

Which of the following structures is unique to the seed of monocot?
A.Coleoptiles
B. Radicle
C. Seed coat
D. Endosperm

Answer 1

Hint: Monocotyledonous seeds are thick in structure coat which consists of two structure endosperm and the embryo. Endosperm consists of nourishing tissues that provide nourishment for the growing embryo.

Complete answer:
Option (A):- Coleoptiles
Coleoptiles is a cylindrical organ that ensheaths the first leaf and shoots Apex in the grass. It helps in the emergence of the first leaf and protects it in the soil.
Option (B):- Radicle
Radicles are also known as the embryonic root / primary root. It is the first organ to grow, it grows downwards and anchors the growing seed in the soil.
Option (C):- Seed coat
The seed coat is the third part of the three parts of the seed which includes the seed coat endosperm and embryo. The endosperm is a good storage unit whereas the seed coat protects the seed from physical, temperature related, and water damage.
Option (D):- Endosperm
The endosperm is a tissue that surrounds and nourishes the embryo in the flowering plants. It provides nourishment in the form of starch to the embryo. In some plants, it is completely absorbed.
So the correct option is A- 'coleoptiles’.

Note: Coleoptiles grow through cell division and they grow until it reaches 5mm long. Oats and maize are favorite Coleoptiles for studies. They are cut down as they reach about 5cm long and apical is cut down at first and then placed in water and buffer solution for further studies.