You Observe a Houseplant on Your Window Sill Bending Toward

Multiple Choice

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 stomata, which close to minimize 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.