A) Ca
B) Zn
C) K
D) Cu
Correct Answer: A
Solution :
Presence of cell wall is the characteristic feature of all plant cells. Cell wall is consisted of three layers, middle lamella or middle layer, primary layer and secondary layer. The position of middle lamella is between two primary walls of different cells and thus functions as cementing layer between these two cells. Main constituents of middle lamella are calcium and megnesium pectate. Primary cell wall is found on either sides of the middle lamella and composed of cellulose, hemicellulose, polysaccharides and many other pectic substances. Secondary cell wall is found on die inner surface of primary wall and composed of cellulose, hemicellulose and polysaccharides.
You need to login to perform this action.
You will be redirected in
3 sec
