Solved aloud Dra Name: Date: Osmosis & Diffusion Worksheet ... - Free Printable

Let’s go step by step to solve this osmosis worksheet.

We are told:
- For cells 1–9, the solute particles cannot diffuse through the membrane — only water can move (osmosis).
- Water moves from areas of higher water concentration (lower solute %) → to lower water concentration (higher solute %).
- We need to:
- A. Draw arrow for water movement (we’ll describe direction)
- D. Show what happens to cell (shrivel or swell)
- E. Name solution type: hypertonic, isotonic, hypotonic
- F. Fill in missing percentages if needed

Also remember:
- Total inside and outside must add to 100% (water + solute = 100%)

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Let’s do each one:

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Cell 1:
Inside: 10% solute → so 90% H₂O
Outside: 20% solute → so 80% H₂O
→ Water moves OUT (from 90% → 80%)
→ Cell shrivels
→ Outside is hypertonic (more solute than inside)

✔ Missing? No — both given.

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Cell 2:
Inside: 40% solute → 60% H₂O
Outside: 30% solute → 70% H₂O
→ Water moves IN (70% → 60%)
→ Cell swells
→ Outside is hypotonic

✔ Missing? No.

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Cell 3:
Inside: ? solute → but says 79% H₂O → so solute = 21%
Outside: 80% H₂O → so solute = 20%
Wait — that doesn’t match label “79% H₂O” inside and “80% H₂O” outside? Let me check image again...

Actually, looking at original:

Cell 3: Inside says “79% H₂O ___% solute” → so solute = 21%
Outside: “80% H₂O ___% solute” → solute = 20%

So inside has MORE solute (21%) than outside (20%) → water moves INTO cell? Wait no:

Water moves from HIGH water % to LOW water %.

Inside: 79% H₂O
Outside: 80% H₂O → higher water outside → water moves INTO cell? But wait — if outside has more water, it should move into cell which has less water? Yes.

But let’s think: higher solute inside means lower water inside → water enters to balance.

Yes: water moves IN → cell swells → outside is hypotonic.

BUT — hold on! The problem says: “For cells 10-18...” — we’re doing 1-9 now. And in cell 3, labels say:

Inside: 79% H₂O → so 21% solute
Outside: 80% H₂O → so 20% solute

So outside has LESS solute → hypotonic → water enters → cell swells.

✔ Fill in blanks: inside solute = 21%, outside solute = 20%

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Cell 4:
Inside: 45% solute → so 55% H₂O
Outside: 60% solute → so 40% H₂O
→ Water moves OUT (55% → 40%)
→ Cell shrivels
→ Outside is hypertonic

✔ Missing? No.

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Cell 5:
Inside: 40% solute → 60% H₂O
Outside: 80% H₂O → so 20% solute
→ Water moves IN (80% → 60%)
→ Cell swells
→ Outside is hypotonic

✔ Missing? Outside solute = 20%

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Cell 6:
Inside: 10% solute → 90% H₂O
Outside: 10% H₂O → so 90% solute
→ Water moves OUT (90% → 10%)
→ Cell shrivels badly
→ Outside is hypertonic

✔ Missing? Inside H₂O = 90%, outside solute = 90%

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Cell 7:
Inside: 18% solute → 82% H₂O
Outside: 80% H₂O → so 20% solute
Compare: inside 82% H₂O, outside 80% H₂O → water moves OUT slightly
→ Cell shrivels a little
→ Outside is hypertonic (20% > 18%)

✔ Missing? Inside H₂O = 82%, outside solute = 20%

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Cell 8:
Inside: 20% solute → 80% H₂O
Outside: 20% H₂O → so 80% solute
→ Water moves OUT (80% → 20%)
→ Cell shrivels
→ Outside is hypertonic

✔ Missing? Inside H₂O = 80%, outside solute = 80%

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Cell 9:
Inside: 35% H₂O → so 65% solute
Outside: 35% H₂O → so 65% solute
→ Same concentration → NO net movement
→ Cell stays same
→ Solution is isotonic

✔ Missing? Inside solute = 65%, outside solute = 65%

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Now let’s compile answers clearly.

Note: Questions 1 and 2 at top:

1. Y or N: Is water always able to diffuse through a cell’s selectively permeable membrane?
→ YES — water can usually pass via osmosis, even if slowly. Some membranes have aquaporins. Generally accepted as yes in basic bio.

2. Y or N: Are solutes always able to diffuse through a cell’s selectively permeable membrane?
→ NO — that’s the point of “selectively permeable”. Only some solutes can pass; others cannot (like in this worksheet).

3. Movement against concentration gradient is called → ACTIVE TRANSPORT

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Final Answers Summary:

Top Questions:
1. Y
2. N
3. Active Transport

Cells 1–9:

We’ll list for each:

A. Arrow direction (describe)
D. Cell change
E. Solution type
F. Missing values

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Cell 1:
A. Arrow OUT
D. Shrivels
E. Hypertonic
F. None missing

Cell 2:
A. Arrow IN
D. Swells
E. Hypotonic
F. None missing

Cell 3:
A. Arrow IN (outside has 80% H₂O, inside 79% → water enters)
D. Swells
E. Hypotonic
F. Inside solute = 21%, Outside solute = 20%

Cell 4:
A. Arrow OUT
D. Shrivels
E. Hypertonic
F. None missing

Cell 5:
A. Arrow IN
D. Swells
E. Hypotonic
F. Outside solute = 20%

Cell 6:
A. Arrow OUT
D. Shrivels
E. Hypertonic
F. Inside H₂O = 90%, Outside solute = 90%

Cell 7:
A. Arrow OUT (inside 82% H₂O, outside 80% → water leaves)
D. Shrivels
E. Hypertonic
F. Inside H₂O = 82%, Outside solute = 20%

Cell 8:
A. Arrow OUT
D. Shrivels
E. Hypertonic
F. Inside H₂O = 80%, Outside solute = 80%

Cell 9:
A. No arrow (or double-headed, but usually none shown for equilibrium)
D. Stays same
E. Isotonic
F. Inside solute = 65%, Outside solute = 65%

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Double-check Cell 3:
Inside: 79% H₂O → 21% solute
Outside: 80% H₂O → 20% solute
Yes — outside has less solute → hypotonic → water enters → correct.

Cell 7:
Inside: 18% solute → 82% H₂O
Outside: 80% H₂O → 20% solute
Outside has more solute → hypertonic → water leaves → correct.

All good.

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Final Answer:

Top Questions:
1. Y
2. N
3. Active Transport

Cells 1–9:

1. A: Out → D: Shrivels → E: Hypertonic → F: None
2. A: In → D: Swells → E: Hypotonic → F: None
3. A: In → D: Swells → E: Hypotonic → F: Inside solute=21%, Outside solute=20%
4. A: Out → D: Shrivels → E: Hypertonic → F: None
5. A: In → D: Swells → E: Hypotonic → F: Outside solute=20%
6. A: Out → D: Shrivels → E: Hypertonic → F: Inside H₂O=90%, Outside solute=90%
7. A: Out → D: Shrivels → E: Hypertonic → F: Inside H₂O=82%, Outside solute=20%
8. A: Out → D: Shrivels → E: Hypertonic → F: Inside H₂O=80%, Outside solute=80%
9. A: No net movement → D: Stays same → E: Isotonic → F: Inside solute=65%, Outside solute=65%