Explanation
Correct Option: D
Explanation:
Cotton, sun hemp, and coir are natural fibres silk is obtained from cocoons of larvae of mulberry silkworms.
That’s why they are not plant-based fibers.
$$\textbf{Correct option: D}$$
$$\textbf{Solution:}$$
Option A:
$$\bullet$$ Root cap provides protection to root apex or root apical meristem.
$$\bullet$$ The tip of the root contains living and sensitive meristematic cells which help in root growth. These cells can be destroyed by friction against the soil.
$$\bullet$$ Thus, the root cap secretes a mucilagenous substance that provides protection to the sensitive tissue while the root grows downwards in the soil.
Option B:
$$\bullet$$ There is nothing like a shoot cap. Primordial leaves protect the shoot apex.
Option C:
$$\bullet$$ Calyptra is a sheath-like protective structure present on the sporophyte capsule of ferns.
$$\bullet$$ It prevents the dehiscence of spores prior to their maturity.
Option D:
$$\bullet$$ Shoot apex or shoot apical meristem is protected by primordial leaves.
$$\bullet$$ Shoot apical meristem is a conical structure that has frequent dividing cells which give rise to primordial leaves. These primordial leaves protect the meristematic cells of shoot apex.
Hence the correct option is option D.
Please disable the adBlock and continue. Thank you.
