Table of Contents
What is tapetum and its function?
Tapetum is the innermost cell layer in the anther, which surrounds the developing pollen mother cells (PMCs) and/or microspores supplying nutrition and enzymes required for microsporogenesis and pollen maturation.
What is function of tapetum Class 12?
A tapetum is the innermost layer of anther wall which surrounds the sporogenous tissue. Tapetal cells nourish the developing pollen grains/Microsporocytes. It also acts as a source of the precursor of the pollen coat.
What is the function of tapetum in which chapter?
The tapetum is the innermost layer of anther wall and surrounds the sporogenous tissue. It plays an important role in pollen development, namely nourishment of micro-spores and formation of exine.
Which of the function of tapetum is correct?
Synthesis of callase enzyme for separation of microspore tetrads.
What is tapetum explain?
1 : any of various reflective membranous layers or areas especially of the choroid and retina of the eye. 2 : a layer of nutritive cells that invests the sporogenous tissue in the sporangium of vascular plants.
What is meant by Ubisch bodies?
Ubisch bodies are the small acellular structure of sporopollenin. They are present in cells of tapetum and help in the development of pollen grains. They are of lipid nature. They appear in the cytoplasm of the tapetal cells during the spore wall formation.
What is the function of Nucellus?
Nucellus makes the most of the ovule. It encloses the embryo sac. They have abundant food reserves and therefore act as nutritive tissues for the embryo in some plants.
What is the role 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.
What happens to tapetum on maturity?
It is eaten up or degenerates.
Why anther is Tetrasporangiate?
The anther is four- sided i.e. it has four locules consisting of 4 microsporangia located in each locule which develops further and becomes the pollen sacs. Thus, the anther is tetrasporangiate because it’s four microsporangia.
Which hormone is secreted by tapetum?
Tapetum 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 is the example of tapetum?
For instance, the tapetum lucidum is a layer of tissue in the eye of many vertebrates, e.g. cats, dogs, birds, fish, etc. but not including humans. This membrane makes the eyes of these animals shine or glow when illuminated in the dark.
Which is function of tapetum is correct?
Tapetum is important for the nutrition and development of pollen grains, as well as a source of precursors for the pollen coat. Secretion of the enzyme callase (β-1,3- glucanase) to dissolve the callosic wall of the tetrad and set them free.
What happens to the outer layer of the tapetum lucidum?
The outermost layer of the cup becomes heavily pigmented and absorbs light (thus helping to prevent images from blurring).
Why are tapetal cells bigger than sporogenous cells?
The cells are usually bigger and have more than one nucleus per cell. As the sporogenous cells undergo mitosis, the nuclei of tapetal cells also divide large nuclear constitution of the tapetum helps in providing nutrients and regulatory molecules to the forming pollen grains. Was this answer helpful?