A gardener sets up a small fan so that it blows gently across some potted ferns on a windowsill. The light intensity, temperature and humidity in the room do not change.
The ferns now lose water vapour from their fronds more quickly.
Which statement explains why?
The moving air dries the soil, so the roots take up water faster by osmosis.
The moving air supplies more oxygen, so the frond cells respire faster and release more water.
The moving air carries water vapour away from the fronds, so the water vapour concentration gradient stays steep.
The moving air cools the fronds, so water evaporates faster from the cells inside them.
114 exam-style questions on OCR GCSE Biology 2.2 The challenges of size, covering 2.2.1 Exchange surfaces and surface area : volume ratio, 2.2.2 Substances transported in organisms, 2.2.3 The human circulatory system, 2.2.4 The heart and blood vessels, 2.2.5 Red blood cells and plasma, 2.2.6 Uptake of water and mineral ions by plants, 2.2.7 Transpiration and translocation, 2.2.8 Xylem and phloem, 2.2.9 Environmental factors and water uptake, and 2.2.10 Using a potometer. Each one has a worked solution and a mark scheme showing where the marks go.