Cell - The Unit of Life — Flashcards
ICSE · Class 9 · Biology
38 flashcards for Cell - The Unit of Life (ICSE Class 9 Biology) to test yourself on key terms and facts. Sample: "What is a cell?"
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What is a cell?
Answer
A cell is the fundamental structural and functional unit of all living beings. It is the smallest part of an organism capable of independent existence and performing the essential functions of life.
Why were microscopes important for the study of cells?
Answer
Cells are microscopic and cannot be seen with the naked eye. Microscopes made it possible to observe cells and discover their structure.
What is a simple microscope?
Answer
A simple microscope is a microscope with a single biconvex lens. Antony van Leeuwenhoek used this type of microscope.
What is a compound microscope?
Answer
A compound microscope uses two lenses for greater magnification. Robert Hooke developed this type of microscope.
Who first observed cork cells and how were they named?
Answer
Robert Hooke examined a thin slice of cork and saw tiny box-like compartments. He called them cells because they reminded him of the rooms of monks in a monastery.
What did Robert Hooke actually see in cork?
Answer
He saw dead cells. He observed only the empty boxes or walls, not living cell contents.
State the three main points of Cell Theory.
Answer
1. The cell is the smallest unit of structure of all living things. 2. The cell is the unit of function of all living things. 3. All cells arise from pre-existing cells.
Which scientists proposed Cell Theory, and who added to it later?
Answer
Schleiden and Schwann proposed Cell Theory in 1839. Rudolf Virchow later added that all cells arise from pre-existing cells.
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