Exploring Osmosis: Isotonic, Hypotonic, and Hypertonic Solutions

The video tutorial explains osmosis as the movement of water across a semi-permeable membrane from higher to lower concentration. It introduces tonicity, which measures osmotic pressure between solutions. The tutorial covers three types of tonicity: hypotonic, hypertonic, and isotonic. Hypotonic solutions cause cells to swell as water enters, potentially leading to rupture. Hypertonic solutions cause cells to shrink as water exits. Isotonic solutions maintain equal solute concentration inside and outside the cell, keeping cell size constant. Demonstrations using dialysis tubing and sugar solutions illustrate these concepts.

What is osmosis?

• The movement of solute molecules across a semi-permeable membrane

• The movement of sugar molecules across a semi-permeable membrane

• The movement of air molecules across a semi-permeable membrane

• The movement of water molecules across a semi-permeable membrane

What does tonicity measure?

• The temperature of a solution

• The osmotic pressure of two solutions separated by a semi-permeable membrane

• The pH level of a solution

• The concentration of water molecules

What happens to a cell in a hypotonic solution?

• It loses water

• It becomes larger and may eventually burst

• It shrinks

• It remains the same size

In the demonstration of a hypotonic solution, what was used to fill the dialysis tubing?

• Air

• Salt water

• Tap water

• Concentrated sugar solution and sugar granules

What is the result of placing a cell in a hypertonic solution?

• The cell remains the same size

• The cell swells

• The cell bursts

• The cell shrinks

What was the content of the dialysis tubing in the hypertonic solution demonstration?

• Air

• Salt water

• Tap water

• Concentrated sugar solution

What term is used to describe a cell that has shrunk in a hypertonic solution?

• Lysed

• Turgid

• Crenate

• Plasmolyzed

What is the characteristic of an isotonic solution?

• Higher concentration of solute inside the cell

• Higher concentration of solute outside the cell

• Equal concentration of solute inside and outside the cell

• No solute present

In the isotonic solution demonstration, what was the content of the dialysis tubing?

• Concentrated sugar solution

• Tap water

• Salt water

• Air

What was the result of the cell's weight in the isotonic solution demonstration?

• The cell gained weight

• The cell lost weight

• The cell's weight remained constant

• The cell burst