Question

Differentiate between the following pairs of terms:

a) Hilum and Micropyle
b)Radicle and Plumule
c)Testa and tegmen​

Answer 1

Your question:Differentiate between the following pairs of terms:

Differentiate between the following pairs of terms:a) Hilum and Micropyle

b)Radicle and Plumule

c)Testa and tegmen

Explanation:

and

answer:

A)Hilum and Micropyle

Hilum is a scar on a seed that shows the connection between the ovule and ovary while micropyle is a pore that shows the point from which the pollen tube entered the ovary during fertilization. So, this is the key difference between hilum and micropyle. Structurally, hilum is a larger area of a seed while micropyle is a small pore. Therefore, we can consider this too as a difference between hilum and micropyle.

Moreover, the major function of the hilum is to fix the ovule to the ovary wall. Whereas, the major function of the micropyle is to facilitate the entry of pollen into the ovary. Functionally, this is a difference between hilum and micropyle. Besides, when considering the regulation of water absorption, hilum controls the water absorption during the final stages of seed formation while micropyle controls the water absorption during the seed germination.

B)Radicle and Plumule

The radicle is the first part that emerges from the seed during the germination through the micropyle (seed pore). It makes the roots of the new plant. Plumule emerges after the radicle and makes the stem of the new seedling. Cotyledons form the first leaves of the seedling.

C)Testa and tegmen

The main difference between testa and tegmen is that testa is the outer seed coat whereas tegmen is the inner seed coat. Furthermore, testa is smooth, thick, impermeable, and may be colored while tegmen is a thin membranous and hyaline.

Testa and tegmen are the two seed coats found in the bitegmic seed of dicots. They form two distinct layers surrounding the embryo, providing protection.