A leaf is photosynthesising in bright light. The cell membranes of its mesophyll cells are permeable to oxygen and carbon dioxide.
The net movement of carbon dioxide is from the leaf air spaces into the mesophyll cells. The net movement of oxygen is from the mesophyll cells into the leaf air spaces.
Which pair gives the concentration relationships that explain these net movements?
carbon dioxide concentration higher in the leaf air spaces than in the mesophyll cells; oxygen concentration higher in the mesophyll cells than in the leaf air spaces
carbon dioxide concentration higher in the leaf air spaces than in the mesophyll cells; oxygen concentration higher in the leaf air spaces than in the mesophyll cells
carbon dioxide concentration higher in the mesophyll cells than in the leaf air spaces; oxygen concentration higher in the leaf air spaces than in the mesophyll cells
carbon dioxide concentration higher in the mesophyll cells than in the leaf air spaces; oxygen concentration higher in the mesophyll cells than in the leaf air spaces
102 exam-style questions on Edexcel GCSE Biology 8.1 Exchange surfaces and diffusion, covering 8.1.1 Introduction to exchange and transport, 8.1.2 Alveoli adapted for gas exchange, 8.1.3 Factors affecting rate of diffusion, and 8.1.4 Rate of diffusion using Fick's law. Each one has a worked solution and a mark scheme showing where the marks go.