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    Exam 39: Plant Responses to Internal and External Signals
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    In the Autumn, the Leaves of Some Trees Change Colour
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In the Autumn, the Leaves of Some Trees Change Colour

Question 33

Question 33

Multiple Choice

In the autumn, the leaves of some trees change colour. This happens because chlorophyll breaks down and the accessory pigments become visible. What hormone is responsible for this?


A) phototropin
B) abscisic acid
C) cytokinin
D) ethylene

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