Carbon dioxide enters a photosynthesising leaf by diffusion. The leaf is very thin. Which statement describes the direct effect of this adaptation?
It increases the kinetic energy of carbon dioxide particles.
It increases the concentration difference across the leaf surface.
It shortens the distance carbon dioxide particles must travel.
It supplies energy from respiration for carbon dioxide uptake.
140 exam-style questions on AQA GCSE Biology 1.3 Transport in cells, covering 1.3.1 Diffusion, 1.3.2 Osmosis, and 1.3.3 Active transport. Each one has a worked solution and a mark scheme showing where the marks go.