Question

the opening of the ovule through which the pollen tube enters with the male gamete​

Answer 1

Explanation:

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Answer 2

Hola!

It may happen through any of the following types:

1) Porogamy : When the pollen tube enters the ovule through micropyle, it is called porogamy. It is the most common type.

e.g., Lily.

2) Chalazogamy : The entry of pollen tube into the ovule from chalazal region is known as chalazogamy. Chalazogamy is less common.

e.g., Casuarina, Juglans, Betula, etc.

3) Mesogamy: The pollen tube enters the ovule through its middle part i.e., through integument(e.g., Cucurbita, Populus) or through funicle (e.g., Pistacia).

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