Pollination → Fertilisation → Zygote formation → Embryo formation
Explanation
Sexual reproduction in flowering plants (angiosperms) follows a specific chronological order of events, categorized into pre-fertilisation, fertilisation, and post-fertilisation stages.Sequence Analysis:
- Pollination: This is the initial step where pollen grains are transferred from the anther (male part) to the stigma (female part) of a flower. It is a pre-requisite for fertilisation as it brings the male gametes in proximity to the female reproductive organs.
- Fertilisation: Following pollination, the pollen tube grows through the style to reach the ovule. The male gamete fuses with the female gamete (egg cell). This process of fusion is called fertilisation (syngamy).
- Zygote Formation: The immediate product of the fusion of the haploid male and female gametes is a single diploid cell known as the zygote.
- Embryo Formation: The zygote undergoes repeated mitotic divisions and differentiation to develop into a multicellular embryo. The embryo is the precursor to the new plant and is contained within the seed.
Key Takeaway: The biological progression of sexual reproduction in plants strictly follows the order: Gamete Transfer (Pollination) → Gamete Fusion (Fertilisation) → Formation of Diploid Cell (Zygote) → Development of New Organism (Embryo).