Question

New cells generate from
A. Bacterial fermentation
B. Regeneration of old cells
C. Pre existing cells
D. Abiotic materials

Answer 1

Hint: This theory was given by Rudolf Virchow. It is a widely accepted theory. It explains the relationship between the living and their cellular composition.

Complete answer:
A cell is the basic building block of an organism. It is a structural, functional and biological unit of an organism. It is the smallest building block in the body. Cell is an enclosed membrane filled with cytoplasm. The cytoplasm is rich in proteins and nucleic acids. The organism can be unicellular and multicellular depending upon the number of cells in the body.
The cells have a life span. Different types of cells in the body have different life spans.
For eg. RBC are expected to have a lifespan of 120 days.
Brain cells are expected to last a lifetime.
New cells are believed to generate from the pre-existing cells. So the correct answer is C i.e pre-existing cells. It is a widely accepted theory as it explains the relationship between the living and the cellular composition. The theory includes—
• Cell is the tiny building block of a living organism.
•cells are formed from old cells. These split into two to form new cells.
• Living being is made up of cells.
Rudolf Virchow completed this theory with his explanation that new cells are formed from pre-existing old cells.

Note:
A human body has multiple types of cells. These cells are formed by the split of old cells.
Red cells have a lifespan of 120 days. Neurons are believed to last a lifetime.