In how many ways, pollen tube may enter into ovule?

Question

In how many ways, pollen tubes may enter into ovule?

Answer 1

The pollen tube may enter the ovule by three different paths as follows: 

• The most common method of entry of pollen tube into ovule is through the micropyle and this method is called polygamy. 
• In some cases, the pollen tube enters the ovule through the chalazal end and this is called chalazogamy. 
• In a few cases, the pollen tube enters the ovule by penetrating through integuments and this type of entry is called misogamy.