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 . 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 circadian rhythms negative phototropism negative thigmotropism negative gravitropism

The correct answer is the opposite of the positive phototropism.

Explanation:

The vines in the tropical rain forests in the given case would primarily exhibit the growth pattern opposite in the direction of positive phototropism. The response of the plant towards the source of light is termed as the positive phototropism. On the other hand, the phenomenon that results in the growth of the plant in the reverse direction is termed as negative phototropism.

Thus, in the given case, in order to reach a large tree, the vines in the tropical rain forests would primarily show a growth movement, which would be the opposite of positive phototropism.