In angiosperms, when the pollen tube enters the ovule through micropyle, it is called ______.

Step-by-step solution

In angiosperms, the entry of the pollen tube into the ovule can occur through different routes. When the pollen tube enters the ovule through the micropyle, the process is known as porogamy. This is the most common type of pollen tube entry. Chalazogamy refers to the entry of the pollen tube through the chalazal end. Mesogamy refers to the entry of the pollen tube through the integuments or funiculus. Siphonogamy is the general term for fertilization involving a pollen tube. Answer: porogamy