Thigmotropism is the phenomenon by which the plants grow with the help of support. Climbing vines uses this climbing behavior to reach upto the top to meet the requirement of sunlight for the process of photosynthesis. The rays of sunlight does not reaches to the plant due to other plants present around them. This adaptation also attracts the pollinators as it increases the visibility of the flower.
Answer: D) to grow high off the ground in order to maximize sunlight exposure
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