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NEET Biology Morphology of Flowering Plants (Root, Stem And Leaf) Question Bank Critical Thinking

  • question_answer
    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 [CPMT 1991]

    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

    Correct Answer: A

    Solution :

    In several species, of Australian Acacia (e.g.,                 A. melanoxylon, A. auriculiformis), the petiole and part of rachis expands to form phyllode. Phyllodes are vertical, have fewer stomata and therefore, lose less water in transpiration.


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