Question

From which cell, the peripheral region of the radicle is produced?
A. Vegetative cell
B. Hypophysis
C. Apical Octant
D. Micropylar octant

Answer 1

Hint: Radicle refers to the plant's embryonic root, which develops into the plant's future root. It's the first section of the embryo that develops into a plant's root system. These embryonic roots penetrate deep into the earth, absorbing all of the necessary minerals, water, and nutrients for their growth and development. The radicle is further classified based on the direction of the plant's growth and development: Antitropy refers to the growth of radicals away from the seed's helium. Syntropous growth refers to the radical's development toward the seed's helium.

Complete answer:
Option A: The vegetative cell in pollen grains is known to extend a pollen tube to carry the two sperm cells to the embryo sac for fertilisation.
So, option A is incorrect.
Option B: The hypophysis, which is the topmost cell of the suspensor, develops into the columella, which is a component of the root cap. The hypophysis produces the radicle and root cap, whereas the suspensor cells degenerate as the embryo develops.
So, option B is correct.
Option C: The cotyledons develop from the embryo's apical octant, whereas the major root radicle develops from the embryo's basal octant.
So, option C is incorrect.
Option D: The cotyledons grow from the apical octant of the embryo, while the primary root radicle grows from the basal octant.
So, option D is incorrect.

Hence, Option B is the correct answer.

Note:
The colour of the radicle is a pale colour. The new plant's root system develops from the radicle. Radicles may absorb water from the earth, which is necessary for the embryonic plant's development. Radicles receive water and nutrients and transports them to the leaves, where photosynthesis can begin. The radicle develops initially during seed germination, through the micropyle of the seed. A root cap protects the newly produced radicle, which operates by absorbing and transporting water and nutrients for the new plant's further growth and development.