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Grade 6 (age 11-12)

Photosynthesis

Photosynthesis

Plants are living things that make their own food. A leaf uses sunlight to turn water and carbon dioxide into food, a process called photosynthesis that also gives off the oxygen we breathe. On this page, change the amount of sunlight and watch photosynthesis grow more active.

How Do Plants Make Food?
70%
🌱 What is Photosynthesis?
①Plants use light energy to make food (glucose)
②Inputs: CO₂ + H₂O + light
③Outputs: glucose (food) + O₂
④More light → more photosynthesis
Structure of a Leaf
50
🔬 Leaf Structure
①Chloroplasts: green particles in leaf cells, site of photosynthesis
②Stomata: tiny pores on leaf underside; CO₂ in, O₂ out
③Palisade tissue: many chloroplasts → active photosynthesis
④Spongy tissue: air channels
Photosynthesis vs Respiration
Photosynthesis
CO₂ + H₂O + light → glucose + O₂
In daytime, in leaf chloroplasts
Respiration
Glucose + O₂ → CO₂ + H₂O + Energy
Day and night, in all cells
💡 Photosynthesis vs Respiration
①Photosynthesis: makes food (day, chloroplasts)
②Respiration: breaks down food for energy (always, all cells)
③They are opposite processes
④Daytime: photosynthesis > respiration → more O₂ released
Summary
Photosynthesis Formula
CO₂ + Water + Light Energy → Glucose + O₂
Plants make their own food
🎯 Key Points
①Photosynthesis: CO₂ + H₂O + light → glucose + O₂
②Site: chloroplasts (green particles)
③Stomata: pores for CO₂/O₂ exchange
④Respiration is the opposite process (always)
⑤Plants supply oxygen and food to all life
Examples and Unit Test
Example 1
Name the three things that go into photosynthesis and the two things it makes.
1
Photosynthesis uses carbon dioxide, water, and light energy.
2
It produces glucose (food) and oxygen.
▸ Inputs: carbon dioxide, water, light / outputs: glucose, oxygen
CO₂ + water + light → glucose + oxygen, in the leaf chloroplasts.
Example 2
In which part of the leaf does photosynthesis happen, and what are the tiny pores that exchange gases (CO₂ and O₂) called?
1
Photosynthesis happens in the chloroplasts, the green grains in leaf cells.
2
The tiny pores on the leaf that let CO₂ in and O₂ out are called stomata.
▸ In the chloroplasts / the pores are stomata
Chloroplasts capture light; stomata exchange gases.
Unit-test style
Which statement about plant photosynthesis is correct?
①Photosynthesis uses oxygen and releases carbon dioxide
②Photosynthesis uses light energy to make glucose
③Photosynthesis happens mainly in the roots
④The products of photosynthesis are carbon dioxide and water
⑤Stomata store the food made by photosynthesis
▸ ② Photosynthesis uses light energy to make glucose
1
Photosynthesis converts CO₂ and water into glucose and oxygen using light energy.
2
Using O₂ and releasing CO₂ describes respiration (①), it happens in leaf chloroplasts (③), its products are glucose and oxygen (④), and stomata are pores for gas exchange (⑤).
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