Question

The rachis is present in
A.Pinnate compound leaf
B.Palmate compound leaf
C.Both A and B
D.None of the above

Answer 1

Hint: Rachis is an axis present in the plant, on which leaves are attached. It is known as the main axis. It is present in compound leaves. In a compound leaf, many leaflets are attached to a common axis known as the rachis.

Complete answer:Since the rachis is present in compound leaves. It is present in pinnately compound leaves. In a pinnately compound leaf, many leaflets arise on either side of the common axis known as the rachis. There are three types of pinnately compound leaves, namely odd-pinnate, even-pinnate, and alternate pinnate arrangements. It is present in plants such as walnut trees.
Considering the other options:
In palmately compound leaves, the leaves take up the shape of the palm, which has the leaflets emerging from the center portion attached to the stem portion. Thus the rachis portion is absent in palmately compound leaves.
Option C is wrong since rachis is only present in pinnately compound leaves and absent in palmate leaves, therefore both A and B are the wrong option.
Option D is wrong since rachis is present in pinnately compound leaves, and not absent in both.
Therefore the most appropriate option is A, that is, the rachis is present in Pinnately compound leaves.

Note:A leaf that is not further divided into smaller leaflets is known as a simple leaf. The attachment of the leaf to the stem is through the petiole. A simple leaf can possess many kinds of margins, it can be smoothed or toothed in nature. These types of leaves are present in plants such as mango trees.