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

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

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The parallel-veined green structure of the adult plant are phylloclades

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The plant shows developmental heterophylly, compound in seedling and simple in adult plant

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The leaves of adult plant are unreduced while they are reduced in the seedling stage

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Solution

The correct option is A Leaves of adult plant are reduced to phyllodes while those of the seedling are unreduced
In Acacia species, the first few leaves are pinnately compound. Then there are leaves with flattened petiole and fewer pinnae. The leaves of adult plant has parallel veined flattened petiole and no pinnae. It shows that leaves of adult plant are reduced to phyllodes while those of the seedling stage are unreduced. The parallel veined flattened petiole in adult plants are called as phyllodes.
Thus, the correct answer is 'Leaves of adult plant are reduced to phyllodes while those of the seedling are unreduced.'

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Statement 2: Opuntia has no leaves – they are reduced to spines.

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