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प्रश्न
How many meiotic and mitotic divisions occur during the development of male gametophyte from the mother cell?
पर्याय
One meiotic and two mitotic
Two meiotic only
Two mitotic only
One mitotic and one meiotic
उत्तर
One meiotic and two mitotic
Explanation:
During microsporogenesis, microsporocytes undergo:
- One meiotic division: To produce a tetrad of four haploid microspores. The released microspores undergo a highly asymmetric division.
- 1st Mitosis: To produce a bicellular pollen grain with a small germ cell engulfed within the cytoplasm of a large vegetative cell. The germ cell undergoes a further mitotic division.
- 2nd Mitosis: To produce twin sperm cells.
So the correct answer is one meiotic and two mitotic divisions.
APPEARS IN
संबंधित प्रश्न
Sketch and label structure of male gametophyte in angiosperm.
Draw a well labelled diagram of male gametophyte of angiosperms.
Identify the CORRECT statement/s with reference to the germ pores present in the pollen grain.
The exine of a pollen grain is made up of ____________.
During which of the following steps does extrusion of second polar body from egg nucleus occur?
Which type of flowers produce ribbon-like pollen grains without exine?
Runners are slender wire-like structures that develop from ______
Which type of pollen grains are found in insect pollinated flowers?
What is Chiropterophily? Why the transfer of pollen grains is important?
What is Xenogamy?
