The branch of biology which deals with the study of plants is called botany.
The correct answer is A.
The plants in the higher altitude have evolved themselves in order to survive the climates. The plants in the mountains have a thick cuticle and pointed leaves.
In mountains, the plant has a thick cuticle to prevent the loss of water in the process of transpiration. The plants have to transport the substances to the higher parts, so they need large air holes.
Hence, the correct option is A that is the plants undergo transportation
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