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In Acacia species, the first few leaves ...

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

A

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

B

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

C

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

D

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

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Identify the Leaf Types in Acacia Species:** - The first few leaves of Acacia species are described as pinnately compound. This means that these leaves have a central stem (rachis) with multiple leaflets arranged on either side. - As the plant matures, the leaves change to those with a flattened petiole and fewer pinnae (leaflets). 2. **Analyze the Adult Plant Leaves:** - In the adult Acacia plant, the leaves are noted to have a parallel-veined structure and a flattened petiole, but they do not have any pinnae. This indicates a significant change in leaf structure as the plant matures. 3. **Understand the Concept of Heterophylly:** - The term "heterophylly" refers to the phenomenon where a single plant exhibits different types of leaves at different stages of its life cycle. In this case, the seedling has compound leaves, while the adult plant has simple leaves. 4. **Define Phyllodes:** - The adult leaves are described as having a flattened petiole and being parallel-veined, which suggests that these structures are not true leaves but rather modifications of the petiole known as phyllodes. Phyllodes are green, flattened structures that perform photosynthesis, similar to leaves. 5. **Conclusion:** - The observation that the adult plant's leaves are reduced to phyllodes while the seedling has unreduced leaves indicates a developmental change from compound to simple leaf forms. This adaptation may serve various functions, such as reducing water loss or optimizing photosynthesis in adult plants. **Final Statement:** - Therefore, it shows that in Acacia species, the leaves of the adult plant are reduced to phyllodes, while those of the seedling are unreduced. ---
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