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Question

Given are some events occurring in plant fertilisation.
A. Pollen lands on stigma.
B. Pollen tube bursts and releases the male gametes.
C. Pollen tube is formed.
D. Male gamete fuses with the egg.
Choose the option which represents the correct sequence of events? 
  1. A C D
  2. A B D
  3. A D B C
  4. A C B


Solution

The correct option is B A B D
Once the pollen lands on the stigma, it forms a pollen tube. The pollen tube moves through the style and reaches the ovary. Once it reaches the ovule, the tip of the pollen tube bursts and releases the male gametes. In the ovule, the male gamete fuses with the egg cell (female gamete) to form the zygote. The zygote develops into the plant embryo and the ovule develops into the seed.

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