Exam-style Questions: Photosynthesis
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Why do plants store some of the sugar they make as starch?
(Marks available: 2)
Answer outline and marking scheme for question: 1
Plants could use starch or glucose. Starch is insoluble, while glucose is soluble.
This means that if starch is used, less water is required to keep its food stored.
(Total = 2 marks)
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What 4 things might affect the rate of photosynthesis?
(Marks available: 4)
Answer outline and marking scheme for question: 2
Amounts of...
- water
- carbon dioxide
- sunlight
- temperature
(Total = 4 marks)
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How do plants stop themselves drying out?
(Marks available: 2)
Answer outline and marking scheme for question: 3
They close their stomata.
The guard cells lose water and become flaccid.
(Total = 2 marks)
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Have a look at this diagram of a small section of a leaf:
Name the regions A to D.
(Marks available: 4)
Answer outline and marking scheme for question: 4
A is a Palisade Cell
B is a Guard Cell
C is a Stoma
D is Air Space
(Total = 4 marks)