Chapter 5: The Fundamental Unit of Life Application Questions | science Class 9 CBSE

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Chapter 5: The Fundamental Unit of Life Application Questions | science Class 9 CBSE | ByteNotes.in

Application Question

Concept in a practical situation

Application

Question 1

Applied Concept

Q1. State five postulates of cell theory.

All living organisms are made up of cells.
Cell is the structural and functional unit of life.
All cells arise from pre-existing cells.
All vital functions occur inside cells.
Cells carry genetic material passed to offspring.

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Application Question

Concept in a practical situation

Application

Question 2

Applied Concept

Q2. Differentiate between prokaryotic and eukaryotic cells.

Prokaryotes lack membrane-bound nucleus and organelles.
Eukaryotes have a true nucleus and organelles.
Prokaryotic DNA is circular; eukaryotic is linear.
Examples: Bacteria (prokaryote), plants/animals (eukaryote).
Cell division is simpler in prokaryotes (binary fission).

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Application Question

Concept in a practical situation

Application

Question 3

Applied Concept

Q3. Describe the structure and function of plasma membrane.

Composed of a phospholipid bilayer with proteins.
It is selectively permeable.
Controls transport of substances in/out of cell.
Supports communication with external environment.
Maintains homeostasis within cell.

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Application Question

Concept in a practical situation

Application

Question 4

Applied Concept

Q4. Describe osmosis and its biological importance.

Osmosis is movement of water across a semi-permeable membrane.
It moves from high to low water concentration.
Helps maintain cell turgidity.
Crucial in nutrient and waste transport.
Regulates internal environment of cells.

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Application Question

Concept in a practical situation

Application

Question 5

Applied Concept

Q5. Explain the role of nucleus in a cell.

Contains genetic material (DNA).
Controls all metabolic activities.
Directs cell division and growth.
Stores hereditary information.
Surrounded by nuclear membrane with pores.

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Question 6

Applied Concept

Q6. What is cytoplasm? State its role.

Fluid matrix inside the cell membrane.
Suspends all organelles.
Site of many biochemical reactions.
Transports materials across the cell.
Helps maintain cell shape and structure.

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Chapter 5: The Fundamental Unit of Life | Application Questions

Q1. State five postulates of cell theory.

Q2. Differentiate between prokaryotic and eukaryotic cells.

Q3. Describe the structure and function of plasma membrane.

Q4. Describe osmosis and its biological importance.

Q5. Explain the role of nucleus in a cell.

Q6. What is cytoplasm? State its role.

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