A Houseplant Placed in a Window Grows Toward the Source

Multiple Choice

A houseplant placed in a window grows toward the source of light because auxin ____.

A) ​becomes more concentrated on the illuminated side of the plant
B) ​becomes more concentrated in the roots of the plant
C) ​becomes more concentrated on the shady side of the plant
D) ​inhibits the growth of cells on the shady side, so the cells on the sunny side grow larger
E) ​inhibits the growth of cells on the shady side, so the cells on the sunny side grow faster