uestion 1
1
Diagram A shows an upright pot plant. Diagram B shows the same pot plant
one week after falling over. The plant was exposed to uniform light from all
directions before and after falling over.
Ground
Diagram A
Ground
Diagram B
1.1.1
Which type of tropism is illustrated in Diagram B?
(1)
1.1.2
Explain why the stem of the plant bent upwards, as illustrated in
Diagram B.
(4)
1.1.3
State how the roots in Diagram B would react.
(1)
(6)
2
Auxins influence the growth of stem and roots.
1.2.1
State where auxins are produced in a plant.
(1)
1.2.2
Describe the effect of auxins on a plant stem that is exposed to
unilateral light.
(4)
1.2.3
Name the phenomenon where buds at the tip of the plant regulate
the growth of the lateral buds.
(1)
(6)
36
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