Diffusion and osmosis experiments

• What is the definition of diffusion?

  The movement of molecules from an area of high concentration to an area of low concentration.
• What is the definition of osmosis?

  The movement of water across a partially permeable membrane from a dilute solution to a concentrated solution.
• What is the definition of active transport?

  The movement of molecules across a cell membrane against the concentration gradient.
• What are the three types of transport mechanisms across cell membranes?

  • Diffusion
  • Osmosis
  • Active Transport
• What is the net movement of molecules in diffusion?

  From an area of high concentration to an area of low concentration, down a concentration gradient.
• What is the net movement of water in osmosis?

  From high water potential to low water potential across a partially permeable membrane.
• What is the water potential of pure water?

  High water potential.
• What is the water potential of a salt/sugar solution?

  Lower water potential.
• What happens to a plant cell in a hypotonic solution?

  The cell absorbs water by osmosis and becomes turgid.
• What happens to a plant cell in a hypertonic solution?

  The cell loses water by osmosis and becomes flaccid.
• What is plasmolysis in plant cells?

  When the cell contents pull away from the cell wall due to water loss.
• What is the effect of potassium permanganate in water during diffusion?

  The potassium permanganate particles diffuse from areas of higher concentration to lower concentration.
• How does gas exchange occur in mammals during inhalation?

  Oxygen diffuses from the alveoli into the blood, while carbon dioxide diffuses from the blood into the alveoli.
• What is the purpose of using a visking tubing bag in osmosis experiments?

  To observe the movement of water through a partially permeable membrane.
• What is the procedure for investigating osmosis using potato cylinders?

  Cut identical cylinders, place them in different sucrose solutions, weigh before and after, and observe mass changes.
• What does it indicate if a potato cylinder does not change in mass after being placed in a solution?

  There was no overall movement of water due to equal concentration inside and outside the cells.
• What are the key terms related to diffusion and osmosis?

  • Diffusion
  • Osmosis
  • Active transport
  • Surface area to volume ratio
  • Concentration gradient
  • Selectively permeable membrane
• What are the learning objectives for the lesson on diffusion and osmosis?

  • Investigate diffusion and osmosis using living and non-living systems
  • Understand the concepts of diffusion, osmosis, and active transport
• How do diffusion and osmosis relate to living organisms?

  • Essential for respiration
  • Important for transport of nutrients
  • Crucial for gas exchange
  • Vital for digestion
• What should students always have for biology lessons?

  Writing equipment, lined, plain and graph paper, and a calculator.
• What is the link to access Inspired AI for biology lessons?

  https://app.century.tech/login/
• What should students do after the lesson?

  Review the lesson content before the next lesson.
• What is the purpose of the poll at the end of the lesson?

  To add two things learned during the lesson.
• What is the significance of the cellulose cell wall in plant cells?

  It helps the plant cells to keep their shape and remain supported.
• What happens to the mass of a potato cylinder in distilled water?

  The mass increases as water moves into the potato cells, making them turgid.
• What is the effect of a concentrated sucrose solution on a potato cylinder?

  The mass decreases as water moves out of the potato cells, making them flaccid.
• How does the concentration gradient affect osmosis in potato cells?

  A greater concentration gradient leads to more water molecules moving out or into the cells.
• What is the role of the capillary tube in the osmosis experiment?

  To observe the level of liquid as water moves through the visking tubing bag.
• What is the expected outcome of placing a potato cylinder in a 0% sucrose solution?

  The potato cylinder will gain mass due to water entering the cells.
• What is the significance of the lesson recording?

  It allows students to review the lesson content at their convenience.
• What is the purpose of the writing equipment in biology lessons?

  To take notes and complete activities during the lesson.