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The Fundamental Unit of Life — Syllabus

Punjab Board · Class 9 · Science

What The Fundamental Unit of Life covers in Punjab Board Class 9 Science: 4 topics, for the 2026-27 session. Topics include Discovery of the Cell and Cell.

45 questions30 flashcards5 concepts

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An illustration depicting Robert Hooke observing a thin slice of cork under his self-designed primitive microscope, showing the honeycomb-like structure of cork cells he described.
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4 Topics · Punjab Board Class 9 Science · 2026-27

Topics in The Fundamental Unit of Life

1

Discovery of the Cell and Cell Theory

  • Robert Hooke (1665) first observed cells in a thin slice of cork using a self-designed microscope. He called the tiny compartments 'cells' (Latin for 'a little room').
  • Leeuwenhoek (1674) discovered free-living cells (microorganisms) in pond water using an improved microscope.
  • Robert Brown (1831) discovered the nucleus inside the cell.
2

Plasma Membrane (Cell Membrane)

  • The plasma membrane is the outermost covering of the cell (in animal cells) that separates the cell contents from its external environment.
  • It is called a selectively permeable membrane because it allows only certain substances to pass in and out.
  • It is made of organic molecules — lipids and proteins.
3

Cell Wall

  • Cell wall is present only in plant cells, fungi, and bacteria — NOT in animal cells.
  • In plants, the cell wall is mainly composed of cellulose, which provides structural strength.
  • The cell wall lies outside the plasma membrane.
4

Nucleus

  • The nucleus is a double-layered structure covered by the nuclear membrane (also called nuclear envelope).
  • The nuclear membrane has pores (nuclear pores) that allow transfer of material between the nucleus and the cytoplasm.
  • The nucleus contains chromosomes — rod-shaped structures visible only when the cell is about to divide.

Key Concepts

A cell is the smallest unitThe plasma membrane is the outermostThe cell wall is a rigidThe nucleus is a membraneCytoplasm is the fluid

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Frequently Asked Questions

What are the important topics in The Fundamental Unit of Life for Punjab Board Class 9 Science?
Key topics in The Fundamental Unit of Life include Discovery of the Cell and Cell Theory, Plasma Membrane (Cell Membrane), Cell Wall, Nucleus. Study these first, then practise questions on each for Class 9 exams.
How should I revise The Fundamental Unit of Life for Class 9 exams?
Learn the core ideas first, then work through the 45 practice questions on The Fundamental Unit of Life. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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