Part 1 - Keywords:

• Osmosis

• Diffusion

• Water Potential

• Concentration Gradient

• Partially Permeable Membrane

• Dilute Solution

• Concentrated Solution

• Turgid

• Flaccid

• Plasmolysis

Part 2 - Key Facts:

• Osmosis is the movement of water molecules from a dilute solution (high water potential) to a concentrated solution (low water potential) through a partially permeable membrane.

• This process happens passively (without energy) and is a type of diffusion.

• In plant cells:

  • If too much water enters, the cell becomes turgid (swollen but firm).

  • If water leaves, the cell becomes flaccid (soft) and may undergo plasmolysis (membrane pulls away from the wall).

• In animal cells:

  • If too much water enters, the cell may burst.

  • If too much water leaves, the cell may shrink.

• Practical Example:

  • Placing potato slices in different sugar solutions can show osmosis.

  • The potato in a dilute solution (more water) will gain mass.

  • The potato in a concentrated solution (less water) will lose mass.

Part 3 - Quick Quiz:

1️⃣ What is osmosis?
2️⃣ What type of membrane is required for osmosis to occur?
3️⃣ How does water move in osmosis – from which solution to which solution?
4️⃣ What happens to a plant cell when too much water enters?
5️⃣ What is the term for a plant cell when it loses too much water?

Part 4 - Answers:

1️⃣ Osmosis is the diffusion of water molecules from a dilute solution to a concentrated solution through a partially permeable membrane.
2️⃣ A partially permeable membrane is required.
3️⃣ Water moves from a dilute solution (high water potential) to a concentrated solution (low water potential).
4️⃣ The plant cell becomes turgid (firm).
5️⃣ The plant cell becomes flaccid or undergoes plasmolysis.

Part 5 - Multiple Choice Questions:

1️⃣ Which of the following best describes osmosis?
a) The movement of water from a concentrated solution to a dilute solution
b) The movement of water through a partially permeable membrane from a dilute solution to a concentrated solution
c) The movement of solute molecules through a membrane
d) The movement of water in and out of a cell by active transport

2️⃣ What happens to an animal cell placed in pure water?
a) It becomes turgid
b) It stays the same
c) It bursts
d) It shrinks

3️⃣ If a potato is placed in a strong sugar solution, what will happen to its mass?
a) Increase
b) Stay the same
c) Decrease
d) Double

Part 6 - Multiple Choice Answers:

1️⃣ b) The movement of water through a partially permeable membrane from a dilute solution to a concentrated solution.
2️⃣ c) It bursts (because water enters rapidly, increasing pressure).
3️⃣ c) Decrease (because water leaves the potato cells by osmosis).

Part 7 - Going Further:

Question:
Why is osmosis important for living organisms?

Answer:
Osmosis helps maintain water balance in cells. In plants, it keeps cells firm, which supports stems and leaves. In animals, osmosis regulates hydration levels in blood and tissues. Without osmosis, cells would not get the water they need for survival.

Part 8 - Revision Tip:

✔️ Remember: Water moves from high to low water potential through a partially permeable membrane!
✔️ Practice: Draw a diagram showing water movement in and out of plant and animal cells.

💡 Fun fact: Jellyfish control their body shape using osmosis! 🌊🐙

Part 9 - More Help:

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GCSE Biology: Osmosis

Webpages

1. Osmosis (AQA GCSE Biology) : Revision Note
   Save My Exams
   This page provides a comprehensive overview of osmosis, including its definition, the process, and its significance in biological systems.
2. Osmosis Questions and Revision
   MME Revise
   Offers detailed revision notes on osmosis, accompanied by example questions and worksheets to test understanding and reinforce learning.

YouTube Video

• GCSE Biology - Osmosis
  YouTube
  This video provides a clear and concise explanation of osmosis, illustrating key concepts with visual aids to enhance comprehension.

Part 10 - GCSE Maths Support:

📚 Easter Maths Revision Sessions with Humaira! 🧮

Looking to boost your maths skills over the Easter holidays? Humaira is offering special revision sessions throughout the break to help you get prepared and feel confident for your exams. Whether you need help with GCSEs or A-Levels, these sessions are tailored to your individual needs.

🗓 Easter Revision Schedule: Check out the schedule below and pick your sessions!

📧 For more information or to book a session, contact Humaira.

📧 As always I will be taking a break from writing the newsletter over the holidays to spend time with family, deliver extra Year 11 revision sessions and catch up on marking.

If you need some extra revision support over Easter remember to check out my archive of newsletters and quizzes.

Until next time happy studying and keep checking back for more GCSE Science revision notes and quizzes.