Question 3(c)
[Maximum number: 3]
Photosynthesis is the process green plants use to convert light energy into chemical energy.
The diagram shows a cross-section through a leaf.
Explain how region A is adapted for photosynthesis.
Edexcel IGCSE Biology 2.21 Mineral ions & plant growth
Practise using leaf cross-sections to explain how tissues and cells are positioned and adapted for photosynthesis and water control.
How this is tested
- use leaf diagrams to identify palisade mesophyll, spongy mesophyll, xylem and epidermis
- explain how transparent epidermis, chloroplast-rich palisade cells and air spaces support photosynthesis
- compare palisade and spongy mesophyll by position, packing, chloroplast number and gas spaces