Question

Entry of pollen tube through the end opposite to micropyle is

Answer 1

Porogamy
Porogamy is the type of fertilisation in which the entry of a pollen tube into an ovule is through the micropyle.


Chalazogamy
Basigamy or chalazogamy is the fertilisation that occurs when the entry of a pollen tube into an ovule is through the chalazal end, i.e., the end opposite to that of the micropylar end.


Mesogamy
Mesogamy is the type of fertilisation that occurs due to entry of a pollen tube into an ovule through the integuments.


Syngamy
Syngamy is the fusion of male and female gametes to produce a diploid zygote.


Final answer
b. Chalazogamy.