Root cap derived froma)Ist Histogenb)2nd Histogenc)3rd Histogend)4th HistogenCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

The 4th histogen is present in monocotyledon called calyptrogen.root cap is formed by calyptrogen in monocots.

Answer

Answer

Calyptrogen(4th histogen)Option D

Answer

The root cap is a protective structure found at the tip of the root in plants. It is derived from the 4th histogen, which is the outermost layer of the apical meristem. The apical meristem is a region of actively dividing cells at the tip of the root, and it gives rise to the different tissues and structures of the root.

The root cap has several important functions, including protection of the delicate apical meristem as the root pushes through the soil, secretion of lubricating substances that facilitate the root's movement through the soil, and perception of gravity to guide the root's growth direction.

Here is a detailed explanation of each option and why option 'D' is the correct answer:

a) Ist Histogen: The first histogen is responsible for the formation of the protoderm, which gives rise to the epidermis of the root. The protoderm forms the outermost layer of cells in the root and does not contribute to the formation of the root cap.

b) 2nd Histogen: The second histogen is called the ground meristem and gives rise to the cortex and endodermis of the root. The cortex provides support and storage functions, while the endodermis regulates the movement of water and nutrients into the vascular tissues of the root. Neither the cortex nor the endodermis contribute to the formation of the root cap.

c) 3rd Histogen: The third histogen is the procambium, which is responsible for the formation of the primary vascular tissues in the root. The primary xylem and phloem are derived from the procambium, but they do not contribute to the formation of the root cap.

d) 4th Histogen: The fourth histogen is the outermost layer of the apical meristem and gives rise to the root cap. The root cap is composed of several layers of cells, including the columella cells at the center, which are responsible for gravity perception. The lateral root cap and the border cells are also derived from the 4th histogen.

In conclusion, the correct answer is option 'D' because the root cap is derived from the 4th histogen, which is the outermost layer of the apical meristem in plants. The root cap plays important roles in protecting the apical meristem, facilitating root movement through soil, and perceiving gravity.

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