DIZNR INTERNATIONAL

What is Osmosis _ It’s Meaning and Definition Diffusion of a solvent (usually water molecules).

Diznr International Diznr International

What is Osmosis _ It’s Meaning and Definition Diffusion of a solvent (usually water molecules).

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Here’s a clear and easy-to-understand explanation of Osmosis — its meaning, definition, and concept — perfect for school students, competitive exams (NEET/NCERT), or general science understanding.

What is Osmosis?

Osmosis is a special type of diffusion that involves only solvent molecules (usually water) moving through a semipermeable membrane.

Definition (English):

Osmosis is the movement of a solvent (usually water) from a region of low solute concentration to a region of high solute concentration through a semipermeable membrane, until equilibrium is reached.

Definition (Hindi – हिंदी में):

ओस्मोसिस (परासरण) एक ऐसी प्रक्रिया है जिसमें जल अणु (या कोई अन्य विलायक) एक अर्ध-पारगम्य झिल्ली के माध्यम से कम सान्द्रता वाले विलयन से अधिक सान्द्रता वाले विलयन की ओर गति करते हैं।

Key Concepts in Osmosis

Concept Explanation
Solvent Usually water (the liquid doing the dissolving)
Solute The substance dissolved (like salt or sugar)
Semipermeable Membrane A barrier that allows only certain molecules (like water) to pass
Direction of Flow Water moves from dilute (less solute) to concentrated (more solute) side

Example in Daily Life:

  1. Plant Roots Absorbing Water: Water enters root hair cells from the soil by osmosis.
  2. Raisins in Water: They swell because water enters through osmosis.
  3. Salt on Plants: Plants shrink/die because water moves out of the cells due to osmosis.

Difference: Osmosis vs Diffusion

Osmosis Diffusion
Only solvent molecules move Both solute and solvent can move
Requires semipermeable membrane Does not need a membrane
One-way flow until balance Can be two-way flow

Simple Diagram Idea:

[Low Solute] Water  →  [Semipermeable Membrane]  →  [High Solute]
         ↓                                     ↓
      More water                       Less water

Osmosis in NEET/Board Exams:

Summary:

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What is Osmosis _ It’s Meaning and Definition Diffusion of a solvent (usually water molecules).

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ICSE Selina Solutions for Class 10 Biology Chapter 4

DIFFUSION AND OSMOSIS