You observe a houseplant on your window sill bending toward the bright afternoon sunlight. Being knowledgeable, you wish to explain the molecular events of the phototropic response to your friend. What is the correct sequence that you would describe?
I. PHOT1 attains a phosphate group, and changes shape
II. cell elongation occurs on the shady side of the plant
III. auxin binds its receptor at target tissues
IV. light strikes PHOT1
V. PHOT1 stimulates downward auxin transport on the shady side of the plant
VI. light strikes stomates, which close, minimizing water loss
VII.cells on the illuminated side of the plant become shorter
A) VI, VII, II
B) VII, II, III, I
C) IV, I, V, III, II
D) IV, VI, III, VII
E) any of these sequences can initiate phototropism
Answer: C
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