Question

The outermost part of a plant cell is
A. Plasma membrane
B. Cell wall
C. Epidermis
D. Cuticles

Answer 1

Hint: A plant is the eukaryotic organism. It has membrane-bound organelles in them. The plasma membrane is outermost covering in almost all the living organisms. In some organisms like algae, the cell wall is outermost covering.

Complete answer:
A cell is a unit structural and functional layer of the living organisms. The cell is made up of the nucleus, plasma membrane and cell wall and cytoplasm. The cytoplasm consists of different organelles.
A cell wall is a rigid or tough and flexible structure and forms an outer layer of a plasma membrane. It is found in fungi and plants. It provides shape to the cell. It protects the cell from mechanical damage and infection and becomes a barrier for unwanted macromolecules. It also helps in cell-to-cell interaction. The cell wall of the plants is made up of cellulose, hemicelluloses, protein and pectins. The cell wall only exists in some organisms, after the cell wall the plasma membrane is the next layer of the cell. The plasma membrane is also called the cell membrane. It is present in all the living organisms that keep the interiors and external environments of the cell separate. It provides protection for a cell.
The epidermis is the outermost layer of cells that cover the stem, leaves, root, flower etc.
It has cuticle waxy coating that provides the barriers against mechanical injury, infection and water loss. The modified epidermal cell regulates the transpiration, secrete substance and increases water absorption.

Hence, the correct answer is option (B).

Note: The cells are different in shape, size, activities and function. Depending upon the presence or absence of the membrane-bound nucleus and other organelles, the cell can be prokaryotes and eukaryotes.