(A) In some plants, the petiole expands, becomes green, and synthesizes food. This modified petiole is known as a $Phyllode$. $Parkinsonia$ and $Austr

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(A) In some plants, the petiole expands, becomes green, and synthesizes food. This modified petiole is known as a $Phyllode$. $Parkinsonia$ and $Australian \text{ } Acacia$ are classic examples where the leaves are small and short-lived, and the petiole performs the function of photosynthesis.