By What produce megaspores and microspores?
The megaspores develop into female gametophytes and the microspores into male gametophytes. Accordingly, strobili bear megasporophylls that contain megasporangia, which will produce megaspores, and microsporophylls that contain microsporangia, which will yield microspores.
Where are microspores and megaspores produced?
Microspores are produced inside the microsporangium. Megaspores are produced inside the megasporangium.
What are microspores produced by?
1. Microsporogenesis: Microspores are formed from microspore mother cells inside the anther. It is the process of formation of microspores from a pollen mother cell through meiosis division. The cells of sporogenous tissues undergo meiotic division to form microspore tetrad.
Which type of cell division produces megaspores and microspores?
meiosis
Mature diploid sporophyte undergoes meiosis to produce haploid unicellular microspores and megaspores.
Why is 3 megaspores degenerate?
In each megasporangium (the female carrier of spores) a megasporocyte is present which leads to four megaspores after meiosis. three of these megaspores degenerate, only one megaspore is functional and forms the megagametophyte with two or three archegonia containing each one egg cell.
What is the function of Endothecium?
The main function of endothecium is of production of pollen grains in anther. As a part of pollen development, the cell lining of anther lumens is called as endothecium. It secretes the material that are essential for the proper maturation of pollen grains in plants.
Are microspores and pollen the same thing?
The key difference between microspore and pollen grain is that microspore is the small spore that develops into the male gametophyte in plants while pollen grain is the small grain that contains the male gametophyte. Microspore and pollen grain are two structures that develop during these two generations.
Is theca and microsporangia same?
Botany. In botany, the theca is related to plant’s flower anatomy. The theca of an angiosperm consists of a pair of microsporangia that are adjacent to each other and share a common area of dehiscence called the stomium. Any part of a microsporophyll that bears microsporangia is called an anther.
What is another name for microsporangia?
What is another name for microsporangia? Male Gametophyte Cell: Generative cell.. what does it produce?
What is mega Sporogenesis?
Megasporogenesis refers to the development of megaspores from the megasporocyte, the cell that undergoes meiosis. Meiosis of the megasporocyte nucleus results in the formation of four haploid megaspore nuclei. In most taxa, meiosis is followed by cytokinesis, resulting in four megaspore cells.