https://i1.wp.com/www.sciencebold.com/wp-content/uploads/2011/11/6_ProkaryoticCell.jpg?fit=800%2C422 422 800 admin http://www.sciencebold.com/wp-content/uploads/2016/07/Untitled-300x114.png admin2011-11-28 02:32:002016-07-26 13:39:22Centrosome, flagella and cell inclusions
The term ‘centrosome’ was coined by T. Boveri in 1888. In the cells of some lower plants and all animals, there occurs radiating structure in the cytoplasm, very close to the nucleus, known as centrosome. It consists of radiating system, the aster or astral rays and a pair of granules, the centrioles.
They help in the formation of spindle fibre at the time of cell division. During nuclear division, the centriole pass to opposite ends of the cell and organizes the nuclear spindle.
Flagella or Cilia
The cilia and flagella are filamentous processes emerging out from the cytoplasm. They are both hair like extensions. Cilia are generally short but numerous, while flagella are relatively long and fewer in number.
The basic role of flagella and cilia is to propel a flow of fluid relative to the cell surface. This result in the locomotion of the entire cells.
Almost all plant cells and many animals cells contain some lifeless substance called cell inclusions (ergastic substances).
These are non-living inclusions of the cell produced during the metabolic activities of the protoplast. They may be of:
1.Reserve food materials, secretary materials and execretory materials.
2.Reserve food materials are carbohydrates, nitrogenous compounds, amino acids, proteins and fats,
3.Secretory materials are nector, enzymes, and coloring matters and excretory materials like latex, gums, resins, oil etc.