Question

Cell membrane is
A. Inner layer of cell wall in a plant cell
B. Outer layer of an animal cell
C. Both A and B
D. None of these

Answer 1

In all living species, the cell membrane is present. It helps to provide support and to maintain the cell’s shape. Plant cells and animal cells are different from each other in the presence of cell walls.

Complete Answer:
- The structural and functional working unit of life is a cell and has also been defined as a building block and an organism’s fundamental unit. The word cell was invented in the year 1665 by an English scientist, Robert Hooke.
- According to their roles and compositions, the structure and size of the cells varies. There are numerous types of cells, depending on the presence or absence of few cell organelles they can be distinguished.
- A few common cell organelles are shared by both plant and animal cells, since both are eukaryotes. It is said that the role of all these organelles is almost the same.

Now, let us find the solution from the options-
- In a plant cell, the cell wall is present which acts as an outer covering of the cell. Beside the cell wall, the cell membrane is found which forms the inner layer in the plant cell.
- Cell membrane is the outer layer in animal cells as animal cells lack cell walls.
- A typical covering of all the cells is the cell membrane. It is the inner layer of the plants' cell wall and the outermost layer of animal cells, since there is no cell wall in animal cells. The inner environment is separated from the outside atmosphere by it.

Thus, the correct answer is option (C) Both A and B.

Note: In animals, it is the outer covering of the cell and envelops other cellular organelles. The cell membrane is flexible, unlike the cell wall, and its form can be modified when required. It is also metabolically active and possesses selective permeability.