A flat, thin, and often green plant organ is called a leaf. It remains affixed to the stem and is mainly found above ground. In this article, you will learn about the definition of a leaf, parts of a leaf, types of leaves and the main functions of leaves.
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Chlorophyll is a pigment that gives leaves their green colour and aids in the process of photosynthesis, which is how plants create food. Green leaves are referred to as foliage as a whole.
As they produce sustenance for both plant and animal life, plant leaves contribute to the maintenance of life on earth. In plants, photosynthesis takes place on the leaf. The process of harnessing solar energy to create food in the form of sugars is known as photosynthesis. Plants can perform their function as primary producers in food chains thanks to their leaves. In addition to producing food, leaves play a significant role in the environment’s carbon and oxygen cycles by producing oxygen during photosynthesis. The shoot system of a plant, which also consists of stems and flowers, comprises leaves.
What are the Different Parts of a Leaf
Let’s jump right into our examination of the various leaf components. The axil, petiole, blade, midrib, and vein are a few of these. These are the primary components of all leaves, while there are other aspects that you might learn about in lessons on more complex sciences.
A typical leaf shows three main parts:
2) Leaf base
3) Leaf blade or lamina
A leaf’s base
It is the bottom of the leaf. The petiole connects to the lamina, and the leaf base to the petiole.
Petiole is the name for the little stalk that a leaf uses to adhere to the stem. The petiole is often referred to as the leaf stalk.
Not all leaves have petioles.
Petiolated refers to a leaf with a petiole. Stalkless or sessile refers to the leaf without a petiole.
FAQs Parts of a Leaf
Q.1. What are the external parts of a plant leaf?
The external parts of a leaf are the petiole, leaf base, lamina, leaf apex, and leaf edge.
Q.2. What are the internal parts of a leaf?
The internal components of a leaf are stomata, guard cells, epidermal cells, mesophyll cells, and vascular bundles (xylem, phloem, veins).
Q.3. What part of a leaf helps in gas exchange?
Ans. Through microscopic pores on the leaves known as stomata, the gas exchange that involves the absorption of carbon dioxide and release of oxygen takes place.
Q4. What is a sessile leaf?
Ans. Sessile leaves are those that have no petioles and are linked to the stem directly. Sessile leaves are seen on achyranthus and saffron plants.