Question

Cell wall is absent in all members of kingdom
A) Monera
B) Fungi
C) Protista
D) Animalia

Answer 1

The outermost layer present in the cell is known as the cell wall. It helps in providing structural support and protection to the cell. It also helps in preventing foriegn substances inside the cell.

Complete answer:
Let us first know more about cell walls. Cell wall is the outermost layer and its composition varies as per the organism. The cell wall found in the plant cell has 3 major layers,

Primary cell wall
Middle lamella
Secondary cell wall

The cell wall is generally made up of cellulose, pectin, hemicellulose and various other smaller amounts of minerals.Now let get the answer from the given option.
Option A: In monera, the cell wall is made up of polysaccharides. Therefore, this is the incorrect option.
Option B: In Fungi, the cell wall is generally made up of chitin. In some fungi, the cell wall is made up of cellulose and glycans. Therefore, this is the incorrect option.
Option C: In Protists, the cell wall may or may not be present. Therefore, this is the incorrect option.
Option D: In Animalia, there is no presence of cell walls. The outermost layer in an animal cell is the cell membrane. One of the major reasons why animal cells do not have cell walls is because if they did then the cells would become stiff just like plant cells. Therefore, this is the correct option.

Thus, the correct answer is option (D) Animalia.

Note: The function of cell wall is as follows,

They control cell expansion which occurs due to water intake
They provide definite shape and structure to the cell
They help in preventing water loss from the cell