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प्रश्न
How many meiotic and mitotic divisions occur during the development of male gametophyte from the mother cell?
विकल्प
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 a pollen grain of angiosperms.
Give a neat and labelled sketch of the germinating angiospermic pollen grain.
Draw a well labelled diagram of male gametophyte of angiosperms.
The exine of a pollen grain is made up of ____________.
The intine of a pollen grain is made up of which of the following?
Identify the INCORRECT statement from tb&' following.
Pollen grain develops from which layer/tissue of the anther?
In angiosperms, the development of male gametophytes takes place from ______
Which type of pollen grains are found in insect pollinated flowers?
Describe the process of development of male gametophyte in angiosperms.
