Which one of the following statements is correct?

  • [NEET 2013]
  • A

    Cleistogamous flowers are always autogamous.

  • B

    Xenogamy occursonly bywind pollination.

  • C

    Chasmogamous flowers do not open at all.

  • D

    Geitonogamy involves the pollen and stigma of flowers of different plants.

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