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Study B3.1.7—Leaf gas exchange adaptations conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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The micrograph shows part of a lilac (Syringa vulgaris) leaf in vertical section.

Explain the roles of two leaf structures that help with the process of gas exchange in the leaf.

a. spongy mesophyll provides a large/moist/permeable surface area (for gas exchange);
b. guard cells form pores/stomata (through the epidermis) / open and close stomata OR stomata are pores (through the epidermis that) allow $\mathrm{CO}_{2} / \mathrm{O}_{2} /$ gases to enter/exit the leaf/to pass through the epidermis;
c. (air) spaces for diffusion/movement/transfer of gases (to/from spongy mesophyll cells and stomata);
2 max

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IB Biology HL B3.1.7 Leaf Gas Exchange Adaptations Topic Practice

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