A leaf is thin and contains large air spaces between its spongy mesophyll cells.
Which statement correctly links both features to gas exchange?
The leaf gives a short diffusion distance; air spaces prevent gases spreading.
The leaf gives a short diffusion distance; air spaces allow gases to spread.
The leaf gives a long diffusion distance; air spaces allow gases to spread.
The leaf gives a long diffusion distance; air spaces prevent gases spreading.
80 exam-style questions on Edexcel GCSE Biology 6.2 Transport in plants, covering 6.2.1 Root hair cell adaptations, 6.2.2 Structure of xylem and phloem, 6.2.3 Transpiration and stomata, 6.2.4 Translocation of sucrose, 6.2.5 Leaf structure for photosynthesis, 6.2.6 Environmental factors on water uptake, 6.2.7 Rate calculations for transpiration, and 6.2.8 Plant adaptations to extreme environments. Each one has a worked solution and a mark scheme showing where the marks go.