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    Question

    Which of following mechanisms does not promotes cross

    pollination:
    A Dicliny Correct Answer Incorrect Answer
    B Cleistogamy Correct Answer Incorrect Answer
    C Dichogamy Correct Answer Incorrect Answer
    D Self-incompatibility Correct Answer Incorrect Answer

    Solution

    Cleistogamy (Correct Answer):      - **Does not promote cross-pollination**, as it allows self-pollination (autogamy)  2. Dicliny (Promotes cross-pollination):      - Presence of unisexual flowers (male and female on separate plants or flowers).   3. Dichogamy (Promotes cross-pollination):      - Temporal separation of male and female maturation (protandry/protogyny).   4. Self-incompatibility (Promotes cross-pollination):      - Genetic mechanism blocking pollen germination on the same plant.   Key Concept: - Cleistogamy (closed flowers, self-pollination).  

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