Photosynthesis

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B2 2
Teacher notes
Answers to summary questions
1 a) A­3; B­1; C­4; D­2.
b) Variegated.
c) i) To enable the colour of iodine reacting with any starch to be clearly
seen.
ii) By boiling in ethanol.
2 a) To make amino acids/proteins.
b) With water from the soil.
c) Dead and decaying animals and plants; fertilisers.
d) Plant A has a magnesium deficiency; Plant B has nitrate deficiency; Plant C
has a potassium deficiency.
Teaching notes
The questions are designed to crystallise knowledge and are not designed to be
exam style. This format is particularly useful for students who have difficulty
answering questions without some kind of writing frame.
AQA Science © Nelson Thornes Ltd 2006 B2 2 1

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B2 2
Continued ...
How plants produce food
1 a) Types of species (1 mark)
b) Light intensity (1 mark)
c) Rapid increase in rate of photosynthesis (1 mark)
up to a light intensity of 20 kilolux (1 mark)
slower decrease in rate (up to 50 kilolux) (1 mark)
d) Any reasonable spread around 20 kilolux (1 mark)
e) 30 kilolux (1 mark)
Both the figure and the units are required. It is important that students
always give units when expressing values.…read more

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B2 2
Continued ...
2 a) E air space
F stoma/stomata
G guard cell (1 mark each)
b) i) C ­ prevents water loss/reduces transpiration (1 mark)
ii) G ­ controls the movement of gases into and out of the
leaf/opens and closes the stomata to allow gases in and out. (1
mark)
For G (guard cell) the important thing is for candidates to convey
the idea of controlling the gases going in and out.…read more

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1.…read more

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B2 2
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each for 1 mark
[2]
3. (a) carbon dioxide/CO2 1
(b) through the roots/root hairs 1
do not accept leaves
(c) oxygen 1
sugar/glucose/other named 1
sugar/starch/carbohydrate
(d) award one mark for each mark point
n.b. accept chloroplast for chlorophyll
n.b. credit the candidate who answers in terms of the white
areas of the leaf
chlorophyll is green 1
e.g. green areas have chlorophyll
chlorophyll/green is needed for 1
photosynthesis
e.g.…read more

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B2 2
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B2 2
Continued ...
increased temperature (up to a point)
increased light intensity
do not accept heat or warmth
altered light quality by less green or
increasing other colours
AQA Science © Nelson Thornes Ltd 2006 B2 1.…read more

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B2 2
Continued ...
(c) any four points 4
· palisade (mesophyll)
· lots of chloroplasts or chlorophyll
or main site for photosynthesis
or absorb maximum amount of light
· guard cells
· CO2 in or O2 out or water vapour
out
· controls size of stoma or pores in
leaf
allow stomata
[12]
6.…read more

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B2 2
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(ii) any one from: 1
flat surface
stomata
thin
chloroplasts
veins
large surface area
air spaces
do not accept chlorophyll
[10]
7.…read more

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B2 2
Continued ...…read more

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