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CAIE IGCSE Biology 6.2.3 Leaf Adaptations for Photosynthesis

Practise explaining how epidermis, palisade and spongy mesophyll, stomata, air spaces and vascular tissues support light capture, gas exchange and transport.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • link a transparent upper epidermis and densely packed palisade cells to efficient light absorption
  • link spongy mesophyll air spaces and stomata to rapid diffusion of carbon dioxide and oxygen
  • explain how xylem supplies water and phloem transports sucrose away from photosynthetic tissues

6.2.3—Structures listed in 6.2.2 adapt question 1

[Maximum number: 3]

Fig. 4.1 is a photomicrograph of a cross section of part of a leaf.

Fig. 4.1

Fig. 4.1

Describe how the tissue labelled B is adapted to maximise photosynthesis.

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