Question

give note in cell wall​

Answer 1

Answer:

• The cell wall is a semi-rigid thick protective structure that surrounds the cell membrane of some types of cells for protection and defining the shape of the cell.
• The cell membrane alone cannot provide the required rigidity or strength.

• All living organisms are composed of cells. The cells are responsible for performing all vital functions such as metabolism, reproduction, and excretion.
• The cell is composed of intracellular structures, such as organelles.
• The organelles have specific functions and are embedded in the cytoplasm.
• The cells are surrounded by a plasma membrane (or cell membrane) to separate the cell contents from the external environment.

Explanation:

What is a Cell Wall?

A cell wall is defined as the non-living component, covering the outmost layer of a cell. Its composition varies according to the organism and is permeable in nature. The cell wall separates the interior contents of the cell from the exterior environment. It also provides shape, support, and protection to the cell and its organelles. However, this cellular component is present exclusively in eukaryotic plants, fungi, and a few prokaryotic organisms.

Cell Wall Structure

The cell wall is the outer covering of a cell, present adjacent to the cell membrane, which is also called the plasma membrane. As mentioned earlier, the cell wall is present in all plant cells, fungi, bacteria, algae, and some archaea. An animal cell is irregular in its shape and this is mainly due to the lack of cell walls in its cells. The compositions of the cell wall usually vary along with organisms.

The plant cell wall is generally arranged in 3 layers and composed of carbohydrates, like pectin, cellulose, hemicellulose, and other smaller amounts of minerals, which form a network along with structural proteins to form the cell wall. The three major layers are:

Primary Cell Wall

The Middle Lamella

The Secondary Cell Wall

The Function of the Cell Wall

The cell wall is an integral component of the plant cell and it performs many essential functions. Following are some of the major cell wall functions observed:

• The plant cell wall provides definite shape, strength, rigidity.
• It also provides protection against mechanical stress and physical shocks.
• It helps to control cell expansion due to the intake of water.
• Also helps in preventing water loss from the cell.
• It is responsible for transporting substances between and across the cell.
• It acts as a barrier between the interior cellular components and the external environment.

Answer 2

• A cell wall is a structural layer found just outside the cell membrane that surrounds certain types of cells.
• It may be tenacious, adaptable, and even strict at times. It works as a filtration mechanism as well as providing structural and protective support to the cell.
• Animals lack cell walls, but most other eukaryotes, such as algae, fungus, and plants, as well as most prokaryotes, have them (except mollicute bacteria).
• One of their primary functions is to serve as pressure vessels, keeping the cell from over-expanding when water is introduced.