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KS2 Science Guide · Year 5–6 · Free lesson

Plants and Photosynthesis

Plants don't eat — they make their own food in their leaves using sunlight. This lesson explains photosynthesis and the jobs of roots, leaves and flowers, clearing up the 'plants eat soil' misconception.

SC7Plants and Photosynthesis
Plants make their own food.
Plants make food from sunlight by photosynthesis — they don't 'eat' soil.
What each part does.
🌿 Leaves
Make food using sunlight (photosynthesis).
🌱 Roots
Anchor the plant and absorb WATER and minerals from the soil.
🌸 Flower
Makes seeds for reproduction — attracts pollinators.
Photosynthesis: leaves + sunlight + water + carbon dioxide → food (sugar) + oxygen.
1

Learn the Parts

1Leaves make food.

Using energy from sunlight, leaves combine water and carbon dioxide into sugar (food), releasing oxygen. This is photosynthesis.

🌿 photosynthesis

2Roots absorb water — not food.

Roots take in water and minerals and anchor the plant. Minerals help the plant grow but aren’t its food.

🌱 water in

3Flowers make seeds.

Pollination (often by insects) lets flowers form seeds, which grow into new plants.

🌸 pollination → seeds
💡 Key IdeaPlants make their own food in their leaves — they don't eat soil. Roots absorb water and minerals; sunlight provides the energy.
2

Worked Example

What does a plant need to grow well, and why does one in a dark cupboard die?

Needs
light, water, air (carbon dioxide), warmth, minerals
No light
without sunlight it can’t photosynthesise
✓ Result
it can’t make food and eventually dies
3

Watch Out! Common Mistakes

‘Plants eat food from the soil.’

They make their own! Plants take WATER and minerals from soil, but their food is made in the leaves by photosynthesis using sunlight.

‘Plants breathe in oxygen only.’

They use carbon dioxide! For photosynthesis, plants take in carbon dioxide and release oxygen — the reverse of our breathing.

Thinking roots make food.

Leaves make food! Roots absorb water and anchor the plant; the food factory is the leaf.

📄 Free printable: Download the Plants and Photosynthesis cheat sheet (PDF) — keep it by your child's desk.

Quick summary

Frequently asked questions

How do plants make food?

In their leaves, by photosynthesis: sunlight provides energy to combine water and carbon dioxide into sugar, releasing oxygen. Plants make their own food rather than eating it.

Do plants eat soil?

No — they absorb water and minerals from soil through their roots, but their food is made in the leaves using sunlight.

What does each plant part do?

Roots absorb water and anchor the plant; leaves make food; the stem carries water and holds the plant up; flowers make seeds for reproduction.

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