Question

Calyptrogen give rise to
A) Root
B) Root cap
C) Plerome
D) Periblem

Answer 1

Hint:Calyptrogen layer of rapidly dividing cells at the tip of a plant root, from which the root cap is formed. It occurs in grasses and many other plants. Knowing the structure of the root will help in knowing tissues giving rise to various parts of the root.

Complete Answer:
The structure of the root is as follows-
1) The root apical meristem gives rise to three primary meristems- procambium, ground meristem, protoderm and the root cap
2) Calyptrogen is a specialized internal meristematic cell derived from the root apical meristem. The calyptrogens divide internally to produce a protective cap-like structure at the root tip called the root cap. The root cap is also known as calyptra.
4) Periblem is a primary meristem which is located between the plerome and the dermatogen and it forms the cortex gives rise to the cortex and the endodermis (compact living cells with hydrophobic substances) which is the innermost layer of the cortex.
5) Plerome is the primary meristem that forms the central core of a plant or plant part which gives rise to vascular tissues.

Additional information:The root cap also contains statocytes, which help in gravity perception in plants that help in the growth of root towards the soil.The root apex is protected by this root cap as it penetrates into the soil.

Hence, the correct answer is B (Root cap).

Note: Osteocytes are cells thought to be involved in gravitropic perception in plants, located in the cap tissue of the roots. They contain statoliths which are actually starch-filled organelles, which sediment at the lowest part of the cells and start differential growth in different patterns, that help bend the root towards the vertical axis.