Question

Which among the following is incorrect about the layers of the cell wall?

(a) The cell wall is made of three main layers, namely, primary cell wall, secondary cell wall and middle lamella

(b) Cell wall of a young plant is made of primary cell which composes a loose network of cellulose microfibrils

(c) Secondary cell wall forms as the cell matures and composes cellulose and lignin

(d) Middle lamella separates cells and is composed of sodium acetate

I got this question at a job interview.

The origin of the question is Cell Basics in chapter Cell : The Unit of Life of Biology – Class 11

Answer 1

The correct option is (d) Middle lamella separates cells and is composed of sodium acetate

Easy explanation: The cell wall is made of three main layers, namely, primary cell wall, secondary cell wall and middle lamella. Cell wall of a young plant is made of primary cell which composes a loose network of cellulose microfibrils. Secondary cell wall forms as the cell matures and composes cellulose and lignin. Middle lamella separates cells and is composed of calcium pectate.