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Question
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
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Solution
The correct option is D Dioecious plant bearing only male or female flowers
Autogamy
Autogamy is a type of pollination that occurs when pollen grains are transferred from the anther to the stigma of the same flower in a plant. This type of pollination can happen in monoecious plants with bisexual flowers.
Geitonogamy
Geitonogamy is a type of pollination that occurs when pollen grains are transferred from the anther to the stigma of a neighbouring flower of the same plant. This can happen in monoecious plants bearing unisexual or bisexual flowers.
Dioecious plants
When the male and female flowers are borne on two different plants, these plants are called dioecious plants. Both autogamy and geitonogamy cannot occur in dioecious plants that bear unisexual flowers. Example:- Papaya, date palms, some members of the cucurbitaceae family.
Monoecious plants
When the male and female flowers are borne on the same plant , these plants are called monoecious plants. These plants prevent autogamy but not geitonogamy.
Final answer: b. Dioecious plant bearing only male or female flowers
Autogamy
Autogamy is a type of pollination that occurs when pollen grains are transferred from the anther to the stigma of the same flower in a plant. This type of pollination can happen in monoecious plants with bisexual flowers.
Geitonogamy
Geitonogamy is a type of pollination that occurs when pollen grains are transferred from the anther to the stigma of a neighbouring flower of the same plant. This can happen in monoecious plants bearing unisexual or bisexual flowers.
Dioecious plants
When the male and female flowers are borne on two different plants, these plants are called dioecious plants. Both autogamy and geitonogamy cannot occur in dioecious plants that bear unisexual flowers. Example:- Papaya, date palms, some members of the cucurbitaceae family.
Monoecious plants
When the male and female flowers are borne on the same plant , these plants are called monoecious plants. These plants prevent autogamy but not geitonogamy.
Final answer: b. Dioecious plant bearing only male or female flowers
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