Osmosis Quiz
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5 questions, one answer each
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1. Which of the following best describes osmosis?
- A. The net movement of water molecules from higher water potential to lower water potential through a partially permeable membrane
- B. The movement of dissolved solutes from a dilute solution to a concentrated solution
- C. The diffusion of water molecules equally in all directions across a cell membrane
- D. The active transport of water molecules requiring energy from ATP
2. What will happen to a plant cell when it is immersed in a concentrated salt solution?
- A. The cell will become turgid as water enters the cell
- B. The cell will become plasmolysed as water leaves the cell
- C. The cell wall will dissolve due to osmotic pressure
- D. The cell will remain unchanged as the cell membrane is impermeable
3. A dialysis tube containing a concentrated sugar solution is placed in distilled water. Which statement explains what happens and why?
- A. Sugar diffuses out of the tube because sugar molecules are small and can pass through the membrane
- B. Water enters the tube by osmosis because the distilled water has higher water potential than the sugar solution inside
- C. The tube becomes rigid because solutes move into the tube by active transport
- D. Nothing happens because dialysis tubing is a fully permeable membrane
4. How does turgor pressure in plant cells contribute to maintaining plant support and structure?
- A. Turgor pressure is created by the cell wall pushing inwards on the cytoplasm
- B. Water inside the cells creates turgor pressure by pressing outwards on the cell wall, keeping the plant rigid and upright
- C. Turgor pressure is generated by the mitochondria producing ATP for cell support
- D. The vacuole shrinks to create pressure that supports the plant tissues
5. A student places equal-sized pieces of fresh potato tissue into three different solutions: distilled water (A), 0.3 M salt solution (B), and 0.9 M salt solution (C). After 30 minutes, which sequence correctly describes the expected changes in the tissues from most turgid to most plasmolysed?
- A. A (turgid) → B (flaccid) → C (plasmolysed)
- B. C (plasmolysed) → B (flaccid) → A (turgid)
- C. B (turgid) → A (flaccid) → C (plasmolysed)
- D. A (plasmolysed) → B (turgid) → C (flaccid)