Page 32 - Ranger SPM 2022 Biology

Biology SPM Chapter 2 Leaf Structure and Function
Practice

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Objective Questions
1. What is the function of cuticle? 4. Among the following pairs, which is the
A Absorb sunlight correct response and effect of stoma?
B Carry out photosynthesis
C Allow gaseous exchange Stoma Effect
D Avoid water loss response
A Close Stoma becomes
2. How does carbon dioxide enter leaf so flaccid
that it can be used for photosynthesis? B Close No water transport
A Through xylem in plant
B Through phloem
C Through stoma C Open Carbon dioxide
D Through mesophyll cells diffuses into leaves
during daytime Form 5
3. Figure 1 shows guard cells and stoma D Open Oxygen and water
of a terrestrial plant. vapour diffuses out
from leaves during
Guard night - time
cell
Stoma
Subjective Questions
Section A
Figure 1
1. Figure 1.1 shows structure X which is
Which of the following activities cause found in lower epidermis of a hibiscus
opening of stoma? leaf.
I Potassium ions exit from guard
cells
II Guard cells become turgid Y X
III Glucose is produced in guard
cells
IV Water diffuses out from guard Z
cells
A I and II Figure 1.1
B II and III (a) (i) Identify structure X.
C III and IV [1 mark]
D I and IV
(ii) Explain functions of structure
X.
[2 marks]

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F5 Chapter 2.indd 227 3/29/22 4:35 PM