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level: 6.4 Gas exchange in the leaf of a plant

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level questions: 6.4 Gas exchange in the leaf of a plant

QuestionAnswer
Adaptations for gas exchange- Stomata, small pores in epidermis, diffusion path short - Air spaces, gases can come into contact with mesophyll cells - LSA of mesophyll cells, rapid diffusion
Gas exchange in plants- CO2 needed for photosynthesis, O2 is the waste gas - O2 needed for respiration, CO2 the waste gas
Stomata role in gas exchange- Stomata open to control rate of gas exchange - Close to minimise water loss - Guard cells control opening + closing