Question:
Dioecy in some plants can prevent ________ .
Dioecy in some plants can prevent ________ .
Show Hint
Male and female flowers are on separate plants.
Updated On: Nov 12, 2026
- allogamy
- xenogamy
- hybridization
- autogamy
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
In dioecious plants such as papaya and date palm, male and female flowers are on different plants.
Step 2: Effect on pollination
A flower is never bisexual, so pollen cannot reach the stigma of the same flower. Geitonogamy is also impossible.
Step 3: Compare the options
Allogamy and xenogamy are cross-pollination, which dioecy promotes, and hybridization involves crossing. Only autogamy is prevented.
Final Answer:
Dioecy prevents autogamy. \[ \boxed{\text{(D) }\text{autogamy}} \]
In dioecious plants such as papaya and date palm, male and female flowers are on different plants.
Step 2: Effect on pollination
A flower is never bisexual, so pollen cannot reach the stigma of the same flower. Geitonogamy is also impossible.
Step 3: Compare the options
Allogamy and xenogamy are cross-pollination, which dioecy promotes, and hybridization involves crossing. Only autogamy is prevented.
Final Answer:
Dioecy prevents autogamy. \[ \boxed{\text{(D) }\text{autogamy}} \]
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