- What is a Microspore?
- Why anther is called Tetrasporangiate?
- What are Entomophilous flowers?
- Is Sporogenous tissue haploid or diploid?
- Which of the following statement is correct Sporogenous tissue is haploid?
- Which part of plant contains Sporogenous tissue?
- Is Microsporangium and anther same?
- What is Stomium in biology?
- Which hormone is secreted by Tapetum?
- Which layer is known as nourishing layer in Microsporangium?
- What is the function of Endothecium?
- What does pollen grain represent?
- What is the function of Sporogenous tissue?
- What do you mean by Microsporangium?
- Is Microsporangia and Microsporangium same?
- Where is Sporopollenin found?
- What is the main function of Tapetum?
- What do you mean by Sporogenous tissue?
What is a Microspore?
Microspores are land plant spores that develop into male gametophytes, whereas megaspores develop into female gametophytes.
Megaspores are structures that are part of the alternation of generations in many seedless vascular cryptogams, all gymnosperms and all angiosperms..
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 are Entomophilous flowers?
Insect-fertilizable or Entomophilous flowers are those which are sought by insects, for pollen or for nectar, or for both.
Is Sporogenous tissue haploid or diploid?
Endothecium is the wall around the microsporangium, which provide protection and help in dehiscence of anther to release the pollen. The sporogenous tissue is diploid. It undergoes meiotic division to form microspore tetrads.
Which of the following statement is correct Sporogenous tissue is haploid?
Explanation: Sporogenous tissue is always diploid, endothecium is second layer of another wll and perform the function of protection and help in dehiscence of anther to release the pollen.
Which part of plant contains Sporogenous tissue?
Sporogenous tissue is located at the centre of each microsporangium in a young anther. With the development of the anther, the sporogenous cells undergo meiotic division to form microspore tetrads. Each sporogenous cell is known as the pollen mother cell. The anther matures and releases the pollen grains.
Is Microsporangium and anther same?
structure of …in terminal saclike structures (microsporangia) called anthers. The number of stamens comprised by the androecium is sometimes the same as the number of petals, but often the stamens are more numerous or fewer in number than the petals.
What is Stomium in biology?
1 : the thin-walled cells of the annulus marking the line or region of dehiscence of a fern sporangium. 2 : the opening in an anther usually between lip cells through which dehiscence occurs.
Which hormone is secreted by Tapetum?
auxinTapetum cells provide nutrients, but auxin produced in tapetum cells is not sufficient to support early stages of pollen development. In contrast, auxin synthesized in sporophytic microsporocytes is necessary and sufficient for male gametophytic development.
Which layer is known as nourishing layer in Microsporangium?
TapetumTapetum is the inner most layer of anther (microsporangium) wall and is generally comprised only a single layer of nutritive cells. It provides nourishment to the developing pollen grains.
What is the function of Endothecium?
This is a transverse section of the anther, the part of the stamen that actually produces the pollen grains. As part of pollen development, the cells lining the anther lumen – a layer known as the endothecium – secretes materials that are essential for the proper maturation of the pollen grains.
What does pollen grain represent?
Pollen grains are generally spherical measuring about 25-50 micrometers in diameter. It has a prominent two-layered wall. The hard outer layer called the exine is made up of sporopollenin which is one of the most resistant organic material known.
What is the function of Sporogenous tissue?
The function of the sporogenous tissues is the production of the pollen grains. Explanation: The sporogenous tissues are located in the microsporangium of the young anther. The sporogenous cells undergoes meiotic division to form the microspore tetrads.
What do you mean by Microsporangium?
Microsporangia are sporangia that produce microspores that give rise to male gametophytes when they germinate. … They are diploid microspore mother-cells, which then produce four haploid microspores through the process of meiosis.
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.
Where is Sporopollenin found?
Sporopollenin is one of the most chemically inert biological polymers. It is a major component of the tough outer (exine) walls of plant spores and pollen grains. It is chemically very stable and is usually well preserved in soils and sediments.
What is the main function of Tapetum?
The tapetum is a specialised layer of nutritive cells found within the anther, of flowering plants, where it is located between the sporangenous tissue and the anther wall. Tapetum is important for the nutrition and development of pollen grains, as well as a source of precursors for the pollen coat.
What do you mean by Sporogenous tissue?
A sporogeneous tissue is a tissue, that consists of a group of tissues which contain the diploid microspore mother cells. These spore mother cells present in the sporangeous tissue divide meiotically to form the haploid microspores that arrange themselves in a tetrad fashion.