NCERT Solutions for Class 9 Science Chapter 5
The Fundamental Unit of Life
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-59
Questions No-1
Who discovered cells, and how?
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Robert Hooke in 1665 discovered the cells. He examined a thin slice of cork under a self-designed crude microscope and observed that the cork resembled the structure of a honey comb. The latter consisted of many tiny compartments. Hooke called them cellulae (singular cellula), now termed cells. Cellula is a Latin name which means ‘a little room’. Such rooms were also present in monastries.
Discovery of Cells by Robert Hooke: Robert Hooke, an English scientist, made the groundbreaking discovery of cells in 1665.
1. Microscope Exploration: Hooke used a microscope he had designed to observe thin slices of cork.
2. Observation: Upon examination, he noticed small, box-like structures in the cork.
3. Term “Cell”: These structures reminded him of the small rooms or cells in monasteries, leading him to coin the term “cell” to describe these compartments.
– Hooke’s observations were published in his book “Micrographia,” where he detailed and illustrated his microscopic findings.
– His description of these tiny compartments in cork as “cells” marked the first known observation of cells, laying the foundation for the study of cell biology.
Cell Theory Development:
– Although Hooke discovered cells, the formulation of the cell theory emerged later in the 19th century through the work of scientists like Matthias Schleiden, Theodor Schwann, and Rudolf Virchow.
– Schleiden and Schwann proposed the cell theory, stating that all living organisms are composed of cells.
– Virchow added the concept that cells arise from pre-existing cells (“omnis cellula e cellula”).
In summary, Robert Hooke’s discovery of cells in cork using a microscope marked the beginning of cell biology, leading to the formulation of the cell theory by later scientists. His work laid the groundwork for our modern understanding of cells and their significance in biological sciences.