A-Level Biology OCR A
Guard Cells Stomata Plants Water Change Shape Draw
| Front |
Draw, label and annotate how guard cells are specialised for their function. |
| Back |
Guard cells:- They form small openings on surfaces of leaves - stomata
- Stomata allow CO2 to enter plants but also allow water to exit plants
- When the cells lose water, they become less swollen due to osmotic forces, change shape and stoma closes to prevent further water loss from plant
- Cell wall is thicker on one side so the cell does not change shape symmetrically as volume changes
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A-Level Biology OCR A