Question

What is cell theory and what does it state?

Answer 1

Hint: Hooke discovered the cell as a result of the invention of the microscope. Hooke noticed box-shaped structures while looking at cork, which he called "cells" because they reminded him of monastic cells, or rooms. This discovery paved the way for the development of classical cell theory.

Complete answer:
Botanist Matthias Schleiden and zoologist Theodor Schwann were researching tissues in the late 1830s when they proposed the unified cell theory. All living beings, according to the unified cell theory, are made up of one or more cells; the cell is the fundamental unit of life, and new cells emerge from old ones. Rudolf Virchow later contributed significantly to this theory.
Although Schleiden and Schwann proposed spontaneous generation as a method for cell origination, this method (also known as abiogenesis) was later disproved. “Omnis cellula e cellula,” as Rudolf Virchow stated. “All cells are born from pre-existing cells”.
The portions of the theory that did not deal with cell origins, on the other hand, have withstood scientific analysis and are now generally accepted by scientists.The following are the widely accepted parts of modern Cell Theory:
The cell is the basic structural and functional unit of all living organisms.
One or more cells make up every organism.
Cells develop from other cells through cellular division.
The cell theory can also be expanded to include:
During cellular division, cells carry genetic material that is passed on to daughter cells.
Chemically, all cells are essentially the same.
Within cells, energy flow (metabolism and biochemistry) occurs.

Note:
The microscopes we use today are far more sophisticated than those used in the 1600s by Antony van Leeuwenhoek, a Dutch shopkeeper with great skill in lens-making. Van Leeuwenhoek studied the movements of protista, a form of single-celled organism, and sperm, which he called "animalcules," despite the limitations of his now-outdated lenses.