What Is The Meaning Of Microsporangia?

What is a anther?

Anther: The part of the stamen where pollen is produced.

Pistil: The ovule producing part of a flower.

The ovary often supports a long style, topped by a stigma..

What is meant by Microsporogenesis?

[ mī′krə-spôr′ə-jĕn′ĭ-sĭs ] The formation of microspores inside the microsporangia (or pollen sacs) of seed plants. A diploid cell in the microsporangium, called a microsporocyte or a pollen mother cell, undergoes meiosis and gives rise to four haploid microspores.

What is Embryosac?

: the female gametophyte of a seed plant consisting of a thin-walled sac within the nucellus that contains the egg nucleus and other nuclei which give rise to endosperm on fertilization.

What are the two major types of Microsporogenesis?

The two primary types of microsporogenesis – simultaneous and successive – differ in the relative timing of Meiosis II, though intermediate conditions have been reported in some species.

Is Microsporangia and Microsporangium same?

Male Gametophyte (The Pollen Grain) In a plant’s male reproductive organs, development of pollen takes place in a structure known as the microsporangium (Figure 5). The microsporangia, which are usually bi-lobed, are pollen sacs in which the microspores develop into pollen grains.

What is the other name of Microsporangium?

two types of sporangia, called microsporangia and megasporangia; the sporophylls associated with them are termed microsporophylls and megasporophylls.

What is male gametophyte?

The functions of the gametophytes are the production of the ‘sperm cells and the female cells, and their union in fertilization. In flowering plants, the pollen grain is the male gametophyte and the embryo sac is the female gametoph yte. The male gametophyte completes its early development within the anther.

What is the difference between Microsporangium and pollen sac?

The anther is bilocular, i.e. it consists of two thecae. Each theca contains two microsporangia, also known as pollen sacs. The microsporangia produce the microspores, which for seed plants are known as pollen grains.

What is the process of Microsporogenesis?

The nucleus of each microspore mother cell undergoes meiosis or reduction division and gives rise to four haploid nuclei. This process is called microsporogenesis. … The partition walls between the sporangia get destroyed and the microspores are liberated by the dehiscence of the anther.

What is the meaning of pollen sac?

pollen sac. The microsporangium of a seed plant in which pollen is produced. The pollen sacs of angiosperms are located in the anthers, while those of conifers are located in the male cones.

Why anther is called Tetrasporangiate?

The anther is four sided i.e. it has four locules consisting of four microsporangia located in each locule which develops further and become the pollen sacs. Thus, an anther is tetrasporangiate because it has four microsporangia.

What happens during Microsporogenesis?

Microsporogenesis comprises the events which lead to the formation of the haploid unicellular microspores. During microsporogenesis the diploid sporogenous cells differentiate as microsporocytes (pollen mother cells or meiocytes) which divide by meiosis to form four haploid microspores.

Is Megasporangium and ovule the same?

Megasporangium is equivalent to the ovule. Megasporangium ovule is connected to the placenta with a stalk called funicle.

Is Megasporangium an ovule?

The ovule appears to be a megasporangium with integuments surrounding it. … Megaspores remain inside the ovule and divide by mitosis to produce the haploid female gametophyte or megagametophyte, which also remains inside the ovule. The remnants of the megasporangium tissue (the nucellus) surround the megagametophyte.