What is the position of secondary cell wall in plant cells?
a) it laid down inside the plasma membrane
b) it laid down inside the primary wall
c) it laid down inside the cytoplast
d) its position is not fixed
Which of the following is/are the characteristic/s of secondary cell wall?
a) more or less rigid
b) crystalline
c) strongly optically active
d) all of these
What is the thickness of secondary cell wall?
a) 1µm
b) 1-3µm
c) 5-10µm
d) 10-15µm
Secondary cell wall is composed of ……
a) cellulose
b) non-cellulosic polysaccharides
c) hemicelluloses and mineral salts
d) all of these
Explanation: mineral salts of Ca, Mg, K and some silica
Proper arrangement of layers in plant cell from inside to outwards is………
a) primary wall - middle lamella - secondary wall
b) secondary wall - primary wall - middle lamella
c) secondary wall – middle lamella – primary wall
d) primary wall – secondary wall – middle lamella
Polysaccharide cellulose is the building material of …….
a) plasma membrane
b) middle lamella
c) primary wall
d) secondary wall
