Adaptations of plants for photosynthesis: gas exchange and stomata | Science

Starter quiz

Which part of a plant takes in gas for photosynthesis and releases gas made by photosynthesis?
- flowers
- leaves ✓
- roots
What is the name of the gas that plants take in for photosynthesis?
- 'carbon dioxide' ✓
What is the name of the gas that plants make as a waste product from photosynthesis?
- 'oxygen' ✓
Carbon dioxide gas and oxygen gas are made up of _____ .
- air
- cells
- minerals
- particles ✓
When particles of a gas move from one place to another, this is called _____ .
- adaptation
- concentration
- diffusion ✓
- reproduction
The diagram shows particles of a gas. Which statement is correct?
- More of the particles will move from area A to area B. ✓
- More of the particles will move from area B to area A.
- The same number of particles will move between both areas.
- The particles will not move.

What is the name of the tiny holes in the surface of a leaf?
- chloroplasts
- guard cells
- stomata ✓
- vacuoles
The diagram shows some structures that make up a plant’s leaf. Which part of the diagram shows one of the leaf’s stomata?
- Part A
- Part B
- Part C
- Part D ✓
______ cells can change shape to open and close stomata.
- 'Guard' ✓
Which process allows gas exchange through open stomata during photosynthesis?
- adaptation
- concentration
- diffusion ✓
- respiration
Which diagram shows the correct concentration gradient of particles of oxygen gas when the cells inside the leaf are photosynthesising?
- Diagram A
- Diagram B
- Diagram C ✓
Which statement describes the net movement of carbon dioxide particles when the leaf cells are photosynthesising?
- Net movement in both directions.
- Net movement from inside the leaf to the outside.
- Net movement from the outside to inside the leaf. ✓
- No net movement in either direction.

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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.