Year 9 - Science
Adaptations of plants for photosynthesis: gas exchange and stomata
Plant nutrition and photosynthesis
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit covers photosynthesis, including how plants produce carbohydrates, absorb water and minerals, and the role of leaf stomata in gas exchange. It highlights the importance of photosynthesis in sustaining life on Earth and explores the adaptations of leaves for photosynthesis.
Lesson Summary
You can describe how plants are adapted to take in and release gases to support photosynthesis.
Key Notes
- Plant leaves take in carbon dioxide gas from the air for photosynthesis
- The oxygen made by photosynthesis is released as a gas from leaves into the air
- This process is called gas exchange
- Leaves have small holes in their surface called stomata for gas exchange
- Molecules of gases move through open stomata by diffusion
Vocabulary To Learn
- gas exchange: Gas exchange in plants is when photosynthesising leaves take in carbon dioxide gas and release waste oxygen gas.
- stomata: Small holes in the surfaces of a leaf.
- guard cells: Cells next to stomata that can change shape to open and close the stomata.
- diffusion: Diffusion is caused by the continuous random movement of molecules of a gas (or of a liquid).
- net movement: When more molecules of a gas (or of a liquid) diffuse from an area of higher concentration to an area of lower concentration.
Common Mistakes To Avoid
- No common-mistake notes are available yet for this lesson.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Plant leaves take in carbon dioxide gas from the air for photosynthesis. The oxygen made by photosynthesis is released as a gas from leaves into the air.
2. Define this scientific word and use it in context. 'gas exchange'
Gas exchange in plants is when photosynthesising leaves take in carbon dioxide gas and release waste oxygen gas. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Systems have only one part. Correction: Systems usually contain several parts working together.
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