Both, autogamy and geitonogamy are prevented in

  • [AIPMT 2012]
  • A

    papaya

  • B

    cucumber

  • C

    castor

  • D

    maize.

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Dioecious condition prevents

In papaya male and female flowers are present on different plants. It permits

The devices to discourage self pollination are

Mention two strategies evolved to prevent self-pollination in flowers.

$A$ : Continued self-pollination checks inbreeding depression.
$R$ : Pollen release and stigma receptivity are synchronised.