In this article we will discuss about the structure of a cell wall in plants. This will also help you to draw the structure and diagram of cell wall in plants. Gross Structure of Cell Wall: A plant cell may consist of either primary wall only or the cell may contain both primary and secondary walls (Fig. 3.1). i. Primary [...]
Polarity is defined as the condition of having distinct poles in a pollen grain. Jackson in 1928 assumed that a pollen grain points to the poles like Silphium. Silphium laciniatum, also known as compass plant, has leaves that 'turn their edges north and south and avoid the mid-day radiation' —Willis. Pollen mother cell after meiosis forms four pollen grains that [...]
The following points highlight the five phenomenon that takes place because of the chemical changes in the cell wall. The phenomenon are: 1. Lignification 2. Cutinization 3. Suberinization 4. Mineralization 5. Mucilaginous Change. Phenomenon # 1. Lignification: In this phenomenon lignin is the substance of impregnation. Lignin is a phenolic polymer and contains three subunits namely-coumaryl, guiacyl and sinapyl-propane. It [...]