Question:
In grasses what happens in micro spore mother cell for the formation of mature pollen grains
In grasses what happens in micro spore mother cell for the formation of mature pollen grains
Updated On: Jun 23, 2024
- One meiotic and two mitotic divisions
- One meiotic & one mitotic divisions
- One meiotic division
- One mitotic division
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The Correct Option is A
Solution and Explanation
In grasses, the formation of mature pollen grains from a microspore mother cell involves: (A) One meiotic and two mitotic divisions.
During this process, meiosis occurs first to reduce the chromosome number, followed by two mitotic divisions to produce a multicellular structure called a mature pollen grain, which contains two cells - a vegetative cell and a generative cell. This generative cell is essential for fertilization in plants.
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Concepts Used:
Fertilisation
Fertilization happens when a sperm fuses with the female act during sexual intercourse and further forms an egg that gets implanted in the uterus of the female. The sperm goes through the fallopian tube and penetrates the zona pellucida layer of the ovum (female egg) and then fuses with it which forms a zygote (fertilized egg). Thousand of sperms are generated in a male body to compensate for the ones unfit and non-motile ones. Once the zygote is created or formed, it gets implanted in the uterus and further growth starts taking place when cells start dividing and forming tissues, and tissues further form organs which result in the formation of an organ system, eventually or in time turning into an organism.