explain the process of fertilization in plant draw a labelled diagram
Answers
✷Plant fertilization is the joining of male and female gametes, resulting in a zygote.
✷The most generalized form of this process requires four steps: pollination, germination, penetration of the ovule, and fertilization.
✷After fertilization, the zygote divides to form an embryo.
Plant fertilization is the union of male and female gametes (reproductive cells) to produce a zygote (fertilized egg). So, how does fertilization occur? It's a pretty straight-forward process that's similar for both flowering plants (angiosperms) and seed-bearing plants (gymnosperms). Let's break the fertilization process down into four generalized steps.
Step 1: Pollination
In general, male gametes are contained in pollen, which is carried by wind, water, or wildlife (both insects and animals) to reach female gametes. The pollen is deposited on a plant's stigma, which is part of the pistil (the elongated part of a flower extending from the ovary). This process is called pollination.
Step 2: Germination
Within a few minutes, pollen tubes begin growing, or germinating, toward the egg cell. These tubes will provide a path for the sperm carried in the pollen to reach the egg.
Step 3: Penetration of the Ovule
The pollen tubes penetrate the ovule, which contains the female gametes.
Step 4: Fertilization
Sperm travel down the pollen tubes and fertilize an egg. Most angiosperms undergo double fertilization, where both an egg and the polar nuclei in the embryonic sac are fertilized