Question

The main arena of various activities of a cell is
A. Mitochondria
B. Cytoplasm
C. Nucleus
D. Plasma membrane

Answer 1

The cell is the basic unit of life.
The different types of cell are found in the living organisms.
Different types of organisms compose cells in their body.
Some cells are composed of only single cells and are known as unicellular organisms.
Some cells are composed of many cells and are known as multicellular organisms.

Complete answer:
The cell perform various type of activities like
1. They provide the structure to the body.
2. They take the nutrients from the food.
3. They convert nutrients into energy.
4. They carried out specialized functions.
5. They contain the genetic material and make copies of them.
Cells contain different types of organelles that perform different functions.
For example: nucleus contains only genetic material which is only used for copying the DNA.
Plasma membrane is also known as cell membrane which protects the cell from the outer environment.
It is the outer covering of the cell.
It allows the selective transport of the material from the environment into the cell.
Mitochondria: It is the special type of organelle which helps in the manufacturing of the energy in the form of ATP. It is known as the powerhouse of the cell. It contain two membranes:
1. Outer membrane
2. Inner membrane
Cytoplasm: 1. It is the site of many enzymatic activities and metabolic reactions.
2. It is the site where cell expands and growth of the cell takes place.
3. It provides the medium for the organelle to suspended
4. The cytoplasm acts as a buffer and protects the genetic material of the cell.
5. Cellular respiration takes place in cytoplasm with glycolysis.
6. Translation of mRNA into proteins on ribosomes
7. Cytoplasmic streaming is important for chloroplast.
8. Cytoplasmic inheritance.

So, the correct option is option B. Cytoplasm.

Note: Main component of cytoplasm are:
1. Cytosol: It is a gel like structure
2. Organelles: They are the cell’s internal sub units.
3. Various cytoplasmic inclusions.
The cytosol is the part of the cytoplasm that is not occupied by any organelle.
It is a gelatinous fluid, where other components of the cytoplasm remain suspended.
It mainly consists of cytoskeleton filaments, organic molecules, salt, and water.