Diagram of a Leaf and its Parts

The leaf diagram shows its various parts clearly. Let’s read about them:

Blade or Lamina

The leaf diagram showing the flat and expanded part is known as the blade or lamina. It is the main site for photosynthesis, where chloroplasts containing chlorophyll capture sunlight and produce food and energy for the plant. The shape, size, margin and arrangement of the blade vary from different plant species each adapted according to their respective environments.

Midrib

The central vein passing through the centre of the leaf lamina is called as the midrib. It is the most prominent and thick vein, extending from the base of the leaf to the tip of the blade. It provides structural support to the leaf and contains the vascular bundles that are responsible for the nutrients and water transport across the leaf.

Veins

The smaller veins that branch off the main midrib are known as the veins. Veins further branch to form venules which together form the intricate vascular system. Veins carry xylem and phloem tissues thus responsible for the transport of water, sugars, and minerals in the entire leaf. Plants are classified into two types based on the pattern of venation. There are 2 types of veination:

• Parallel Venation (e.g., monocots like grasses) – the veins are arranged parallel to each other
• Reticulate Venation (e.g., dicots like mango) – veins forms a complex network

Petiole

The petiole is the stalk that connects the leaf blade to the plant stem. It serves as a conduit to transport water, sugars, and nutrients from the leaf to the rest of the plant. In a few plants, the petiole also plays a key role in the orientation, of the leaf so that the leaf gains maximum exposure to sunlight.

Margins

The edges of the leaf lamina are known as margins, and they exhibit various forms, such as smooth, serrated, toothed or lobed. The purpose of this margin is to defend plants from herbivores and also to adapt for efficient water retention.

The leaf diagram shows the structure of a leaf, including the blade, veins, and petiole, helping us understand how plants exchange gases and nutrients. Plants play a crucial role as they provide oxygen and shelter, and are a food source for the life on Earth.

The leaf diagram class 6 and class 10 provide a basic understanding of the structure of leaves and plants. The leaf diagram with labels shows different parts which helps us learn about processes like photosynthesis and transpiration.

The diagram of leaf with labelling is given below: