Why Anther Is Called Dithecous?

How many Microsporangia are present in an anther?

four microsporangiaThe bilobed nature of an anther is very distinct in the transverse section of the anther.

The anther is a four-sided (tetragonal) structure consisting of four microsporangia located at the corners, two in each lobe.

The microsporangia develop further and become pollen sacs..

What is a Sporogenous tissue?

Often referred to as the pollen sac, anthers are bi-lobed structures that typically rest atop long slender stalks called filaments. … The anthers are comprised of tissues that contain spore-producing cells called microsporocytes.

Is anther a Microsporangium?

…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.

Is anther Dithecous or Tetrathecous?

1. A typical young anther is bilobed, tetrathecous and tetrasporangiate. 2. A typical mature anther is bilobed, dithecous and tetrasporangiate.

Is theca and Microsporangia same?

The typical 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. If the pollen sacs are not adjacent, or if they open separately, then no thecae are formed.

What do you mean by Microsporangium?

Microsporangia are sporangia that produce microspores that give rise to male gametophytes when they germinate. Microsporangia occur in all vascular plants that have heterosporic life cycles, such as seed plants, spike mosses and the aquatic fern genus Azolla.

What is the main function of anther?

The main function of the anther of a flower is to produce the pollen of flowering plants. The pollen contained within the anther provides the sperm necessary for reproduction.

Why anther is Dithecous?

A typical angiosperm is bilobed with each lobe having two theca. Hence angiosperm anther are called dithecous.. When the anther is young, a group of compactly arranged homogenous cells called sporogenous tissues occupies the centre of each microsporangium which produce micro spores or pollen grains.

Is anther Dithecous?

A stamen or male reproductive organ of a flower is made up of two parts- a stalk-like filament and a knob like terminal anther. Each anther has two lobes which are attached at the back by a sterile band called connective. When both the anther lobes are present, the stamen is called bithecous(or dithecous).

How many types of anther are there?

fourdispersal (Esau, 1977, D’Arcy, 1996; Tebbitt & Maciver, 1999; Abid & Qaiser, 2004), There are four anther types based on their splitting lines by which pollen are released viz.

How many theca are present in anther?

two thecaA typical angiosperm anther has two parts, an anther and a slender, thread like filament. Each anther is a bilobed structure, i.e., it has two lobes, and each lobe is dithecous i.e., has two theca. Each theca has a mass of sporogenous tissue which develops into microsporangium or pollen sac.

What is structure of anther?

The fertile portion of stamens is called anther. Each anther is usually made up of two lobes connected by a connective. In turn each anther lobe contains two pollen chambers placed longitudinally. All pollen grains of an anther lobe remain united in a sac called pollinia.

What do u mean by Dithecous?

Dithecous. (Science: botany) Having two thecae, cells, or compartments. Origin: Pref. Di- – theca.

What is meant by Bilobed and Dithecous anther?

An anther is bilobed and dithecous means each anther has two lobes and each lobe again has two chambers. … So there are four microsporangia in each anther. If the anthers are not lobed, they can only accommodate one sporangium. To produce more number of pollens by each anther, it is bilobed and dithecous.

What do you mean by Dithecous anther?

Dithecous anther are those anthers which have two anther lobes connected by a connective. … The Plants bear unisexual flowers i.e. stamens and carpels occur in different flowers. They may be present on same plant e.g., in maize or on different plants e.g. in Papaya.