Question

Cell wall formation in a dividing plant cell is determined by which of the following?
A- microfilament
B- microtubules
C- rough E.R
D- golgi apparatus

Answer 1

Hint: A cell wall is a structural layer surrounding different types of cell that are present outside the cell membrane. It is tough, flexible and rigid. We know that in dividing plant cells after nuclear division, the cell plate appears across the equator where mitosis occurs.

Complete answer: As we may recall, a non - rigid structure called a cell wall forms an outer covering for the plasma membrane of many plants and fungi. The cell wall not only gives shapes to the cell but also protects the cell from the mechanism of damage and infection, it also helps in cell- to- cell interaction and provides a barrier to undesirable macromolecules.
Algae have a cell wall, made of cellulose , galactose, and many minerals like calcium carbonate, while in other plants it consists of cellulose, hemicellulose , pectin and proteins. The middle lamella is a layer mainly of calcium pectate which holds the different neighbourhood cells together. The cell wall and middle lamella may be transversed by plasmodesmata which connects the cytoplasm of neighbouring cells.
After the nuclear division, the phragmocyst or well call it as cell plate appears across the equator of the cell. At the end of mitosis, granules arise from the golgi apparatus that arrange themselves on the equator. After this, they fuse together to form up a cell plate. This cell plate later growns by addition of new material from the complex. Narrow opening, the plasmodesmata are left in the cell plate and cytoplasmic connections between the cells are retained. During development , middle lamella is formed first which consists of gelatinous material called calcium pectate. After the period of growth is over, a secondary cell wall may be laid down between primary cell wall and the cytoplasm of the cell.

So, the correct answer is option D, Golgi apparatus.

Note: Cell wall is present in plants that helps mainly in both structural support and protection and also acts as a filtering mechanism. It is made up of polysaccharide cellulose, hemicellulose and pectin. A major function of it is to act as a pressure vessel thus which will prevent over- expansion of the cell when water goes into it.