Question

Grafting is not possible in monocots because they
(a) Lack cambium
(b) Have scattered vascular bundles
(c) Have parallel venation
(d) Are herbaceous

Answer 1

Hint: Grafting is a technique where tissues of plants are joined to continue their growth together. This requires the vascular tissues to grow together.

Complete answer:
Monocots cannot be grafted as they lack the cambium tissue. The dicot plants have the cambium tissue which is a meristematic tissue and is present in the vascular bundles of the plant. This tissue has a regeneration capacity because of which it can form new tissue at the time of grafting. The lack of cambium in monocot plants makes it impractical to graft. This process only works with dicot plants and gymnosperms and not with monocots.
In grafting a freshly cut branch from one woody plant is taken and attached to the body of another plant at the place where a similarly-sized branch was cut off. The branch is then firmly secured to the plant and usually after a few weeks, the two grow together and become strong enough to support the new growing plant. Such joining of vascular tissue together is called inosculation.
Let’s see the connection with monocots and other options: Monocot stems have scattered vascular bundles and monocot roots have their vascular bundles arranged in a ring while dicot stems have vascular bundles in a ring arrangement. Vascular bundles consist of both phloem and xylem which is the part of the transport system and helps in enhancing water and solute transport. This doesn’t affect grafting as vascular bundles play a role in the transport system.
Parallel venation is a type of venation seen mostly in the monocot plants, where the veins of the leaves run parallel to each other from the base to the tip of the leaf lamina. Plants having parallel venation are Banana, grasses, wheat, etc. the arrangement of veins in a leaf doesn’t affect grafting.
Herbaceous plants are those plants that do not have woody stems and don’t often grow into trees. This doesn’t affect grafting.
So, the correct answer is “Lack cambium”.

Note: Grafting is commonly used in asexual propagation for horticultural (practice of plant cultivation) and agricultural trades. In this process the upper part of the combined plant is called the scion and the lower part of the combined plant is called the rootstock.