Question

Grafting is not possible in monocots, because
A. Vascular bundles are scattered
B. Vascular bundles are closed
C. Hypodermis is sclerenchymatous
D. Vascular bundles are open

Answer 1

Grafting is often a horticultural procedure in which plant tissues are linked to continuing their mutual growth. The upper portion of the combined plant is referred to as the scion, while the rootstock is considered the lower part.

Complete answer:
Monocotyledons are grass or grass-like flowering plants, usually referred to as monocots, the seeds from which typically involve only one embryonic bud or cotyledon. They are one of the largest classes through which the flowering plants have historically been split, with two cotyledons in the remainder of the flowering plants and thus known as dicotyledons or dicots.
Now, find the solution from the options-
- The vascular bundles are scattered within monocot stems. In dicot stems, the ring is distributed in vascular coils. Thus, option A is not the correct option.
- As they lose the cambium tissue, which is found in dicot plants, monocot plants cannot be grafted. Cambium tissue found in the vascular bundles of the dicot plants is meristematic tissue. At the moment of grafting, this tissue has a regeneration potential owing to which it can establish new tissue. The disappearance of monocots with cambium renders it difficult to graft.
- In a monocotyledonous stem, the sclerenchymatous hypodermis is located. It is thick with 2-3 layers and lies just under the epidermis type. It is composed of fibres of dense-walled lignified sclerenchyma. Thus, option C is not the correct option.
- In dicotyledonous roots, among phloem and xylem, cambium is available. These vascular bundles can establish secondary xylem and phloem tissues because of the existence of cambium and are thus considered open vascular bundles. Thus, option D is not the correct option.

Hence, the correct answer is option (B).

Note: Grafting is a combination of the stock plant with the scion stems. Stock and Scion characters were not combined with flowers & fruits. The plant characters displayed should still belong to the Scion. In both species, the combination of internal tissues named cambium is necessary for effective grafting; the stock and scion evolve together as a single organism when such a union occurs.