Entry of the pollen tube through micropyle is known as: (JRF Plant Science 2019)

✅Explanation: Porogamy is the most common type of fertilization in flowering plants where the pollen tube enters the ovule through the micropyle.
📌Other Options Explanations:○ (A) Mesogamy: Pollen tube enters through the integuments○ (B) Microgamy: Male gamete is directly transferred to the egg cell without a pollen tube○ (D) Chalazogamy: Pollen tube enters through the chalaza
🔑Key Points::• It is a process of fecundation in which the pollen tube penetrates the embryo sac through the tissue of the chalaza, instead of entering through the micropyle.• The term "Chalaza" is defined as the structure inside bird, reptile eggs, and plant ovules. It attaches or suspends the yolk or nucellus within the larger structure.• In most flowering plants, the pollen tube enters the ovule through the micropyle opening in the integuments for fertilization (porogamy). In chalazogamous fertilization, the pollen tubes penetrate the ovule through the chalaza rather than the micropyle opening.• In plant ovules, chalaza is located opposite the micropyle opening of the integuments. It is the tissue where the nucellus and integuments are joined.• Nutrients from the plant travel through the vascular tissue in the funiculus and outer integument through the chalaza into the nucellus.• During the development of the embryo sac inside a flowering plant ovule, the three cells at the chalazal end become the antipodal cells.