Answer: Micropyle.
- A Raphe
- B Chalaza
- C Hilum
- D Micropyle
Correct answer: D. Micropyle
Explanation: The micropyle is a small opening at one end of the ovule through which the pollen tube typically enters during fertilisation.
Double fertilisation in angiosperms: one male gamete fuses with the egg to form the diploid zygote (syngamy), while the second fuses with the two polar nuclei to form the triploid primary endosperm nucleus (triple fusion). Image: Triploid, CC BY 3.0, via Wikimedia Commons.
Concept context
Flower structure, pollination, double fertilization, and seed/fruit development - the highest-scoring Class 12 biology chapter in NEET.
Read the full Sexual Reproduction in Flowering Plants notes →