Buttress roots are

Aerial

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Vertical

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Aquatic

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Horizontal

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Solution

The correct option is D Horizontal
Buttress root extends above ground as a plate-like an outgrowth of the trunk supporting the tree. Buttress roots are mainly found in trees of tropical rainforests. These roots spread horizontally, so they are able to cover a wider area for collecting nutrients. They stay near the upper soil layer because all the main nutrients are found there.
Hence, the correct option is D.

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S1: A common feature of many tropical rainforests is the distinct buttress roots of trees.
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