Page 33 - Ranger SPM 2022 Biology

Biology SPM Chapter 2 Leaf Structure and Function
(b) State two differences between cell (i) Daytime
Y and cell Z. (ii) Night - time
[2 marks] [8 marks]
(c) Figure 1.2 shows effect (c) Gaseous exchange between the
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of temperature on rate of plant and atmosphere occurs
photosynthesis. through structure F. However,
Photosynthesis rate during night - time, structure F
is closed. Explain how gaseous
exchange occurs in the leaf at
night.
[4 marks]

Section C
Temperature (ºC)
5 10 15 20 25 30 35 40 3. (a) (i) Describe how light energy
Figure 1.2 is converted to chemical
Based on Figure 1.2, explain the energy, which is then stored
relationship between temperature as carbohydrate in plants.
and rate of photosynthesis. [4 marks]
[4 marks] (ii) Plants are important to
Form 5
humans and our environment.
Section B
Describe the importance of
2. Figure 2.1 shows a cross-section of a plants to the environment.
leaf with its parts labelled as A, B, C, [6 marks]
D, E and F.
A (b) Figure 3 shows a greenhouse.
B
C
D

E F
Figure 2.1 Figure 3
(a) Describe how cells A, B, C and D In the greenhouse, suggest how
are adapted for photosynthesis. the conditions are controlled to
[8 marks] ensure that the plants grow at
(b) Explain the roles of structure E in maximum rate.
controlling the opening and closing [10 marks]
of structure F during the following
situation:

Chapter 2 Answers

228

F5 Chapter 2.indd 228 3/29/22 4:35 PM