Question

A leaf without petiole is-
a. Sessile
b. Subsessile
c. Sub petiolate
d. Simple

Answer 1

Hint: The stalk of a leaf that connects the leaf blade to the stem is called the petiole of the leaf. The petiole is capable of twisting the leaf to face the sun. This provides the plant a characteristic of the foliage arrangement of the leaf.

Complete answer:
A leaf typically divides into the three-part, they are the lamina, the petiole, and the stipule. The lamina is also known as the leaf blade which is the flat part of the leaf. It is the widest part of a leaf. Petiole is the stalk of the leaf that extends from the stem to the base of the leaf. And the stipule is the small green appendage usually found at the base of the petiole.

The petiole is a stalk that attaches a leaf to the plant stem that is the petiole that connects the leaf blade to the stem. In leaves, the leaf stalk or petiole may be as long as in the leaves of spinach and rhubarb, short or completely absent.

In flowering plants, a petiole is generally narrow and thin and provides support by attaching the leaf blade to the stem. In some plants, the petioles become modified or specialized in a way that they become leaf-like in appearance and serve not only to support the leaf but to carry out photosynthesis as well.

Not all leaves have petioles. In some plants, leaves are attached directly to the plant stem. Leaves that do not have petioles, they belong to the broomrape family. These types of leaves are called sessile leaves.

Sub petiolate leaves are the type of leaves that hold an extremely short petiole and may appear sessile. Here the option subsessile is also meant that there is a chance nearly but not quite sessile. And the simple leaves refer to the leaves in which three-parts can be observed clearly. Grasses do not generally have petioles, but some have petiole-like structures called pseudo petioles.

Hence, the correct answer is option (A).

Note: The petiole is a part of the leaf. It is a stalk that attaches a leaf to the stem of a plant. Petiole helps to hold the leaf blade to the sunlight. Another function of the petiole is to help the blade to flutter in the wind. A leaf without petiole is called a sessile leaf. So, in a single word petiole is a connection between the stem and the lamina.