The Leaf

Key Notes :
Definition:
- A leaf is a part of a plant that is usually green and flat. It grows on the stem or branches of the plant.
Parts of a Leaf:

- Blade (Lamina): The flat, broad part of the leaf that captures sunlight.
- Veins: Lines on the leaf that carry water and nutrients.
- Petiole: The stalk that attaches the leaf to the stem.
- Midrib: The central vein that provides support.
Functions of a Leaf:
- Photosynthesis: The process where leaves make food for the plant using sunlight, water, and carbon dioxide.

- Respiration: Leaves help plants breathe by taking in oxygen and releasing carbon dioxide.

- Transpiration: Leaves release extra water as vapor through tiny openings called stomata.

Types of Leaves:

- Simple Leaves: Have a single blade (e.g., mango leaf).
- Compound Leaves: Have multiple small leaflets (e.g., neem leaf).
Shapes and Sizes:

- Leaves come in different shapes like oval, heart-shaped, or needle-like, and vary in size from very small to very large.
Leaf Venation:

- Parallel Venation: Veins run parallel to each other (e.g., grass).
- Reticulate Venation: Veins form a net-like pattern (e.g., peepal).
Importance of Leaves:
- They produce oxygen, which humans and animals need to breathe.
- They provide food for plants and animals.
Examples of Edible Leaves:

- Spinach, lettuce, and mint are leaves that humans eat.
Fun Fact:
- The color of a leaf changes to yellow, orange, or red in autumn due to less chlorophyll production.
Let’s practice!