Cell: The Unit of Life Class 11 Notes (NCERT + Cell Theory + MCQ + NEET PYQ)

Introduction to Cell Biology

This chapter explains the fundamental unit of life, including cell structure, discovery of cell, and cell theory for Class 11 and NEET preparation.

Every living organism, whether simple like bacteria or complex like a human being, is composed of microscopic units called Cells. The cell is the fundamental structural and functional unit of all living organisms.

Unicellular Organisms

Organisms made of a single cell (e.g., Amoeba, Bacteria). They are capable of independent existence.

Multicellular Organisms

Organisms made of many cells (e.g., Plants, Animals).

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Discovery of Cell

Robert Hooke (1665)

First observed "cells" in a piece of cork.

Anton Von Leeuwenhoek

First saw and described a live cell.

Robert Brown

Discovered the Nucleus in the cell.

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Cell Theory

The Cell Theory was a major turning point in biology. It was formulated by two scientists:

Matthias Schleiden (1838)

A German botanist who observed that all plants are composed of different kinds of cells.

Theodore Schwann (1839)

A zoologist who concluded that animal cells are composed of cells and described the plasma membrane.

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Modern Cell Theory

Rudolf Virchow (1855)

Proposed that all cells arise from pre-existing cells (Omnis cellula-e cellula).

• All living organisms are composed of cells and their products.
• All cells arise from pre-existing cells.

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Important MCQs for NEET & Board Exams

Q1. Who first saw and described a live cell?
A) Robert Hooke
B) Anton Von Leeuwenhoek
C) Robert Brown
D) Rudolf Virchow
Answer: B

Q2. The concept of Omnis cellula-e cellula was proposed by:
A) Schleiden
B) Schwann
C) Rudolf Virchow
D) Aristotle
Answer: C

Q3. Which is an exception to Cell Theory?
A) Bacteria
B) Fungi
C) Virus
D) Algae
Answer: C

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Previous Year Questions (PYQ) - NEET

Q1. Who proposed the statement “Omnis cellula-e cellula”?
A) Schleiden
B) Schwann
C) Rudolf Virchow
D) Robert Hooke
Answer: C

Q2. Who first observed and described cells in cork?
A) Robert Brown
B) Anton von Leeuwenhoek
C) Robert Hooke
D) Virchow
Answer: C

Q3. Who first observed living cells?
A) Robert Hooke
B) Anton von Leeuwenhoek
C) Schleiden
D) Schwann
Answer: B

Q4. Cell theory was proposed by:
A) Robert Hooke and Brown
B) Schleiden and Schwann
C) Virchow and Hooke
D) Leeuwenhoek and Brown
Answer: B

Q5. Who discovered the nucleus in the cell?
A) Robert Hooke
B) Robert Brown
C) Schleiden
D) Schwann
Answer: B

Q6. Which of the following is an exception to cell theory?
A) Bacteria
B) Fungi
C) Virus
D) Algae
Answer: C

Q7. Which scientist concluded that plants are composed of cells?
A) Schwann
B) Schleiden
C) Virchow
D) Hooke
Answer: B

Q8. Which scientist concluded that animals are composed of cells?
A) Schleiden
B) Schwann
C) Virchow
D) Brown
Answer: B

👉 Next Topic: Prokaryotic Cells Class 11 Notes (Coming Soon)

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