Leaf
Leaves make food by photosynthesis; green colour from chlorophyll.
Leaf
Leaf
What you'll learn
- Leaves make food by photosynthesis using sunlight.
- Green colour from chlorophyll.
- Leaves also breathe and release extra water vapour.
- Looking Around 3, Chapter 5 — leaf rubbing and tree study.
Key concepts
Level 1 — Core idea
Verbal: Leaves are the plant's kitchen — sunlight + water + air → sugar food.
Symbolic: Leaf + sunlight + CO₂ + water → food + oxygen (simplified).
Visual: Broad green leaf facing sun catches more light.
Level 2 — Going deeper
Without green chlorophyll, leaf cannot make food well. Stomata (tiny pores) let gas in/out — microscope preview. Old leaves may turn yellow and fall — plant redirects food to new leaves.
NCERT anchor
NCERT Looking Around 3, Chapter 5 leaf collection activity. Compare shapes: neem, banana, mango. Notice veins carrying water through the leaf.
Worked example
Why most leaves are green?
Step 1 — **Chlorophyll** captures sunlight
Step 2 — Chlorophyll looks green
Answer: green = **food-making ready** ✓
Plant in dark room — what happens to leaves?
Step 1 — No sunlight → poor photosynthesis
Step 2 — Plant weakens over time
Answer: leaves need **light** to make food
Common mistakes
| Mistake | Why | Fix |
|---|---|---|
| Roots make food | Underground kitchen myth | Leaves make food |
| All leaves same shape | One drawing only | Shapes vary — function similar |
| Leaves only breathe for us | Forget food role | Main Class 3 job: photosynthesis |
| Yellow leaf works best | Colour ignored | Green chlorophyll needed |
Quick check
- What is photosynthesis in simple words?
- Which part makes food?
- Why leaves face sunlight?
- Stretch: Why do some plants lose leaves in dry season?
Revision tip: Remember Leaf = Light-powered kitchen.
Open the Practice tab for graded questions on Leaf.
Key Takeaways (TL;DR)
- What you'll learn
- Key concepts
- Worked example
- Common mistakes
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