Question

What is Microspores​

Answer 1

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Microspores are more rounded than previously and contain several large vacuoles that ultimately coalesce into a single vacuole.

Microspores are land plant spores that develop into male gametophytes, whereas megaspores develop into female gametophytes. The male gametophyte gives rise to sperm cells, which are used for fertilization of an egg cell to form a zygote.

Where are Microspores produced?

The pollen-producing stamens are initiated in the third whorl of the flower. The carpel in the fourth whorl contains the female gametophyte. The stamens contain four groups of cells, called the microsporangia (pollen sacs), within an anther. The microsporangia undergo meiosis to produce microspores.

What is the meaning of Microspore?

• Any of the spores in heterosporous plants that give rise to male gametophytes and are generally smaller than the megaspore.

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Answer 2

ANSWER :-

• The microspores are small (0.015 mm to 0.06 mm) in diameter.
• The microspores have rounded bases covered by two layered walls.
• The outer layer of a microspore is called "exine" and is spiny in texture.
• The inner layer of a microspore is called "intine" and is smooth in texture.
• The first division leads to the formation of a small prothallial cell and a large antheridial cell.
• The larger antheridial cell, by further divisions gives rise to a central group of four primary androgonial cells that are surrounded by eight jacket cells.
• At this 13 celled stage (1 prothallial + 8 jacket cells and 4 primary androgonial cells), the microspore is shed from the microsporangium.