In Acacia species,the first few leaves are pi | vedclass

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Question

(A) In several species of Australian $Acacia$ (e.g.,$A. melanoxylon$,$A. auriculiformis$),the petiole and part of the rachis expand to form a phyllode

Vedclass · Accepted Answer

Leaves of the adult plant are reduced to phyllodes,while those of the seedling are unreduced.

Vedclass · Answer

(A) In several species of Australian $Acacia$ (e.g.,$A. melanoxylon$,$A. auriculiformis$),the petiole and part of the rachis expand to form a phyllode.Phyllodes are vertical,have fewer stomata,and therefore,lose less water through transpiration.This modification helps the plant survive in arid conditions by reducing water loss.Thus,the leaves of the adult plant are reduced to phyllodes,while the seedling leaves are unreduced (pinnately compound).

In $Acacia$ species,the first few leaves are pinnately compound. Then there are leaves with flattened petiole and fewer pinnae. The leaves of the adult plant have parallel-veined flattened petioles and no pinnae. It shows that:

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