Carbon dioxide enters the leaf via stomata, which are opened by guard cells, diffuses through air spaces, and then into mesophyll cells, maintaining a concentration gradient.
O dióxido de carbono entra na folha através dos estômatos, que são abertos por células-guarda, difunde-se através dos espaços de ar e depois para as células do mesofilo, mantendo um gradiente de concentração.
| Front | Describe how carbon dioxide in the air outside a leaf reaches mesophyll cells inside the leaf. (3 marks) |
|---|---|
| Back | (Carbon dioxide enters) via stomata; (Stomata opened by) guard cells; Diffuses through air spaces; Allow concentration gradient. Reject along gradient unless direction made clear Down diffusion gradient; |
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