What is the tendency for plants that live on other plants (epiphytes) to send shoots upward while sending roots down toward the ground?

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Quizplus · Accepted Answer

Positive gravitropism is the tendency for roots to grow downwards while negative gravitropism is the tendency for shoots to grow upwards. Epiphytes do not have direct access to soil, so they send their roots down towards the ground to absorb water and nutrients. At the same time, they send shoots upwards towards sunlight for photosynthesis, exhibiting both negative gravitropism and positive gravitropism. Thigmotropism is the growth of a plant in response to touch and is not relevant to this scenario.

What Is the Tendency for Plants That Live on Other