Question

Study the diagram given below and name the parts marked as A, B and C. What happens when B reaches C in the ovary? Mention its significance.

Answer 1

The parts of the diagram are:
A: Stigma – the part of the pistil that receives the pollen.
B: Pollen tube – a tube that grows from the pollen grain to deliver the male gametes to the ovule.
C: Ovule – the structure in the ovary that contains the egg cell (female gamete).
When the pollen tube (B) reaches the ovule (C) in the ovary, fertilization occurs. The male gamete from the pollen grain fuses with the egg cell inside the ovule, forming a zygote. This is an essential step in sexual reproduction in plants, as it leads to the formation of seeds for future plant growth.