Vines in tropical rain forests must grow toward large trees before being able to grow toward the sun. To reach a large tree, the most useful kind of growth movement for a tropical vine presumably would be the opposite of
A) positive thigmotropism.
B) positive phototropism.
C) positive gravitropism.
D) sleep movements.
E) circadian rhythms.

Question

Quizplus · Accepted Answer

Positive phototropism is growth towards light, so the opposite would be growth away from light, which is not useful for vines that need to reach large trees before growing towards the sun.

Vines in Tropical Rain Forests Must Grow Toward Large Trees