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Endosmosis

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eMusic Study Pack • Biology
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📖 Comprehensive Note

Endosmosis is the net movement of water molecules into a cell across a selectively permeable membrane when the cell is placed in a hypotonic solution (the surrounding solution has higher water potential than the cell interior). Water moves from the surrounding solution into the cell, causing the cell to swell and become turgid (important for plant cell rigidity). Endosmosis is a passive process (osmosis), driven by differences in water potential and does not require metabolic energy.

Contrast: Exosmosis — water leaves the cell in hypertonic conditions (leading to shrinkage/plasmolysis). Isotonic conditions produce no net water movement.

🎤 Lyrics + Audio

Verse 1 Water moves from the surroundin solution where water potential is higher, into the cell where water potential is lower. uh uh As a result, the cell absorbs water and becomes swollen or turgid — oh, what power! yes heh This process helps plant cells maintain firmness and support, A gift of balance in nature’s court. UUh...uh..uh Endo..Endo... Chorus Endosmosis is the movement of water molecules into a cell through a selectively permeable membrane hmm when the cell is placed in a Hypotonic solution ohhhhhhhhohhh (a solution with higher water potential). Verse 2 When a plant cell is placed in pure water, water enter the cell by endosmosis, causing it to become turgid. The cell stands tall and firm, well-ridged! Chorus Endosmosis is the movement of water molecules into a cell through a selectively permeable membrane hmm when the cell is placed in a hypotonic solution ohhhhhhhhohhh (a solution with higher water potential).
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📊 Line-by-Line Study Guide

Lyric LineExplanation
Water moves from the surrounding solution...Water moves from higher water potential (outside) into the cell (lower water potential) by osmosis.
Cell absorbs water and becomes turgidPlant cells become firm/turgid due to increased internal pressure (turgor), which supports the plant.
Endosmosis definitionEndosmosis: inward movement of water into cells in hypotonic environments.
Hypotonic solution (higher water potential)Examples: pure water or dilute solutions where water enters cells.
Contrast with exosmosis/plasmolysisOpposite occurs in hypertonic solutions (water leaves cell → plasmolysis); isotonic means no net change.
Biological importanceTurgor pressure from endosmosis helps plants maintain rigidity, upright growth, and stomatal function.

💡 Mnemonic

"IN = Endo (EN)" — water goes IN to the cell during endosmosis (hypotonic outside).

❓ Quiz

1. Endosmosis moves water:

2. Endosmosis occurs when the cell is placed in:

3. Result in plant cells after endosmosis:

4. Which condition leads to no net water movement?

5. Driving factor for endosmosis?

🃏 Flashcards

Q1: Define endosmosis.
Movement of water into a cell through a selectively permeable membrane when placed in a hypotonic solution.
Q2: What is turgor?
Internal pressure in plant cells due to water uptake, making them firm and supportive.
Q3: What happens in isotonic solution?
No net water movement; cell volume remains stable.
Q4: Example that demonstrates endosmosis?
Plant cells placed in pure water swell and become turgid (onion epidermis experiment).

🎯 Drag & Drop

Drag descriptions to the correct category.

Endosmosis (Hypotonic)
Exosmosis (Hypertonic)
Isotonic
Water enters cell — turgid
Water leaves cell — plasmolysis
No net water movement
Plant cells in pure water swell

📌 Summary

  • Endosmosis: water moves into cells when placed in hypotonic solutions → cell swells and becomes turgid.
  • Turgor pressure from endosmosis gives plant cells rigidity and support.
  • Opposite processes: exosmosis (water exits in hypertonic solutions) and isotonic (no net movement).