In this article we will discuss about the symmetry of pollen and spore wall of plants. The term symmetry with relation to a pollen grain implies similarity of halves on either side of a median line or plane so far as aperture and ornamentation etc., are concerned. Most pollen and spores are symmetrical. As a rule, symmetric pollen and spores [...]
In this article we will discuss about the process of thickening of cell wall in plants, explained with the help of suitable diagrams. The cell plate separates the two protoplast of a dividing cell. The cell plate gives rise to the middle lamella upon which the wall materials are laid down to form primary wall. During cell growth, each daughter [...]
In this article we will discuss about the chemical composition and functions of plasma membrane. Chemical Composition of Plasma Membrane: The membrane is mainly composed of lipids, proteins and carbohydrates. Water makes about 29% of total weight. Robertson (1959) proposed that plasma membrane is three-layered structure where proteins form the outer and inner layers of membrane that encloses lipids to [...]