The Leaf: The Food Factory
Identify plant parts and understand how they work together to sustain life.
1.0 The Building Blocks of a Plant
Plants are complex living organisms. Every part of a plant works like a specialized team member to help it grow, breathe, and reproduce.
Figure 1: The 5 Main Parts - Roots, Stem, Leaves, Flowers, and Fruits.
2.0 Roots: The Underground Anchors
The root is the part of the plant that usually grows hidden beneath the soil.
2.2 Three Main Types of Roots
- Tap Root: One thick main root (Primary) with smaller branches.
Examples: Mango, Tomato, Gram. - Fibrous Root: A cluster of thin, equal-sized roots from the stem base.
Examples: Wheat, Rice. - Adventitious Root: Roots growing from branches or leaves instead of the radicle.
Example: Banyan Tree (Prop Roots).
3.0 The Stem: The Plant's Highway
The stem connects the roots to the leaves, acting as a transport system for water and nutrients.
Aerial Stems
Visible above ground. Includes Tendrils (climbing) and Thorns (protection).
Underground Stems
Hidden storage units like Potatoes (Tubers) and Ginger (Rhizomes).
4.0 The Leaf: The Food Factory
Leaves are green because of Chlorophyll, and they are the primary site for making food.
| Feature | Reticulate | Parallel |
|---|---|---|
| Pattern | Net-like veins | Straight, side-by-side |
| Root Type | Tap Root | Fibrous Root |
5.0 How Plants Live
The Photosynthesis Recipe:
CO₂ + Water + Sunlight + Chlorophyll → Carbohydrates + Oxygen
Tiny pores on the leaf bottom for breathing. Controlled by Guard Cells.
The "sweating" of plants. It cools the plant and helps pull water from roots.