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      Question

      Heteromorphic self-incompatibility is due to differences

      in:
      A Flower morphology Correct Answer Incorrect Answer
      B Pollen viability Correct Answer Incorrect Answer
      C Chromosome number Correct Answer Incorrect Answer
      D Pollen tube growth Correct Answer Incorrect Answer
      E Endosperm formation Correct Answer Incorrect Answer

      Solution

      Heteromorphic systems (e.g., pin-thrum flowers in Primula) prevent selfing via morphological barriers.

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