Across
- 1. it is needed for photosynthesis - plants get it from the star at the centre of our solar system.
- 5. is produced when photosynthesis happens.
- 8. is a gas essential for photosynthesis.
- 9. is needed by plants as it makes up the cell walls in plant cells
Down
- 2. this is not needed for photosynthesis, but a rise or a fall in it will affect the rate at which the plant photosynthesises.
- 3. makes up chlorophyll
- 4. it is obvious when this is not present in a plant as the leaves turn yellow with green veins.
- 6. this green substance is essential for photosynthesis.
- 7. are needed as they help collect essential minerals.