What is the means of Bilobed?
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What is the means of Bilobed?
Definition of bilobed : divided into two lobes a bilobed nucleus.
What is the meaning of Bilobed and Dithecous?
In a flowering plant, the typical anther has two lobes, which are termed as bilobed anther. An anther has two theca. The cavity of the anther lobe is called theca. The lobes having two thecae are termed dithecous.
Whats a bilobed nucleus?
A lobed quality inhering in a nucleus by virtue of the nucleus being divided into or having two lobes. Tree view. Term mappings.
What is the definition of theca?
Definition of theca : an enveloping sheath or case of an animal or animal part.
What is a bilobed structure?
The male reproductive part of the flowering plant has stamens. These stamens are filamentous structures that support the anther that produces the pollen grains. These anthers have two lobes and are termed bilobed anthers. The transverse section of the anther helps to distinguish this bilobed structure.
Which one is the Bilobed structure in the following?
Solution : The anther is a bilobed structure containing 2 thecae and 4 sporangia. An angiosperm anther is bilobed with each lobe having 2 theca. There is a longitudinal groove which separates the theca….
| Question | |
|---|---|
| Chapter Name | Sample Paper 1 |
| Subject | Biology (more Questions) |
| Class | 12th |
| Type of Answer | Video |
Why is anther called Dithecous?
A typical anther is always a bilobed and dithecous structure. Theca is a chamber on the anther lobes. Usually, each lobe has two theca and is hence named as dithecous. The transverse section of the anther shows two microsporangia in each lobe.
What is difference between Bilobed and Dithecous?
an anther is described by different terminologies. bilobed anther means the anther has 2 lobes. dithecous anther means each lobe of an anther contains two theca and thus called dithecous. tetrasporangiate means the anther contains 4 sporangia or we can say microsporangium.
What are lobes in cells?
Lobation is a characteristic of the cell nucleus of certain granulocytes, which are types of white blood cells, where the nucleus is segmented into two or more connected lobes. Of the four types of granulocyte only the mast cell is not lobated. Lobation is also a characteristic of megakaryocytes in the bone marrow.
Which white blood cell has a bilobed nucleus?
Eosinophils
Eosinophils have a bilobed nucleus and are extremely important in fighting parasitic infections as well as some viral infections.
What is difference between theca and microsporangia?
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.
Is theca and lobe same?
Lobe is the flat part projecting from one of the ends of the anther filament. Anther is bilobed i.e it contains two lobes. Each lobe have two theca. Theca are the cavity in the lobes.
What is lobes in anther?
Lobe is the flat part projecting from one of the ends of the anther filament and also Anther is bilobed i.e it contains two lobes. Each lobe has two thecae. Theca is the cavity in the lobes. Each theca contains two microsporangia, also known as pollen sacs.
What is anther wall?
The anther wall contains four layers called the epidermis, endothecium, middle layer, and tapetum. Inside anther locules, pollen mother cells undergo meiosis to form microspores enclosed in the tetrad. After release, microspores further develop into mature pollen (Goldberg et al., 1993; van der Linde and Walbot, 2019).
Why anther is called Bilobed?
Answer: 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.
What is Tetrasporangiate?
Pollen containing chamber that has four sac is known as tetrasporangiate anther. Example: Angiosperm posses tetrasporangiate anther.
What is Monothecous and Dithecous anther?
Monothecous anthers have a single lobe with two pollen chambers in it. They are also called bisporangiate as they have two pollen chambers. Example: Hibiscus rosa-sinensis, cotton, Cannaceae. Dithecous anthers have two lobes with two pollen chambers in each.
Which leukocytes are Bilobed?
Basophils. Basophils are intermediate in size between neutrophils and eosinophils and have simple or bilobed nuclei.
Are white blood cells white?
Contrary to their name, white blood cells are colorless but can appear as a very light purple to pink color when examined under a microscope and colored with dye. These extremely tiny cells have a round shape with a distinct center membrane (nucleus).
Are basophils Bilobed?
Basophils are the least abundant granulocyte, representing 0.5-1% of the WBC count. They possess abundant, basophilic specific granules and a bilobed or sometimes S shaped nucleus.
