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2.2 The challenges of size

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Question 46
F

Leaves have stomata on their lower surface.

What is the function of the guard cells around each stoma?

[1]
A

To carry water from the roots up to the leaf

B

To absorb light for photosynthesis in the cells of the leaf

C

To open and close the stoma to control gas exchange

D

To make sugars and transport them to the roots

Markscheme

2.2 The challenges of size Questions

  1. GCSE
  2. /Biology
  3. /2.2 The challenges of size

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.

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