Question

Pollentube enters the mycropyl into theough

Answer 1

Explanation:

Entry of pollen tube into ovule : After reaching ovary, the pollen tube enters the ovule. Pollen tube may enter the ovule by any one of the following routes :

(i) Porogamy : When the pollen tube enters the ovule through micropyle, it is called porogamy. It is the most common type. e.g., Lily.

(ii) 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. It was first observed by Treub (1981) in Casuarina.

(iii) 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).