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Question
Commonly the pollen tube enters the ovule through
Commonly the pollen tube enters the ovule through
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Solution
The correct option is D Micropyle
Entry of pollen tube into the ovule
Once the pollen grain germinates after receiving water and nutrients that the stigma releases, a pollen tube arises which travels through the style to enter the ovule. Entry of the pollen tube into the ovule can be through 3 different points:
1) Micropyle
2) Chalaza
3) Integuments
Porogamy
In porogamy, the pollen tube enters the ovule through the micropylar opening This is the most common route of entry for the pollen tube in most plants.
Chalazogamy
In chalazogamy, the pollen tube enters through the chalazal end. It occurs in plants such as Betula, Casuarina etc.
Mesogamy
In mesogamy, the pollen tube enters through the integuments, e.g., in Cucurbita, Pistacia etc.
Final answer
(D) Micropyle
Entry of pollen tube into the ovule
Once the pollen grain germinates after receiving water and nutrients that the stigma releases, a pollen tube arises which travels through the style to enter the ovule. Entry of the pollen tube into the ovule can be through 3 different points:
1) Micropyle
2) Chalaza
3) Integuments
Porogamy
In porogamy, the pollen tube enters the ovule through the micropylar opening This is the most common route of entry for the pollen tube in most plants.
Chalazogamy
In chalazogamy, the pollen tube enters through the chalazal end. It occurs in plants such as Betula, Casuarina etc.
Mesogamy
In mesogamy, the pollen tube enters through the integuments, e.g., in Cucurbita, Pistacia etc.
Final answer
(D) Micropyle
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