3N Diffusion

Which of the following does not describe diffusion?

• Movement of particles from a region of lower concentration to region of higher concentration
• Does not require energy.
• Does not require a membrane to occur.

Which of the following allows movement of water vapour from air spaces in the leaf to the environment?

• diffusion
• osmosis
• evaporation
• active transport

Which of the following is an example of diffusion in a plant?

• Carbon dioxide from the air moving into a photosynthesising leaf.
• Ions moving into root hairs against a concentration gradient.
• Sugars in phloem moving from leaves to roots.
• Water in xylem moving from roots to leaves.

A partially permeable membrane is filled with starch suspension and placed in a beaker containing iodine in potassium iodide solution. After 10 minutes the colour of that liquid inside the partially permeable membrane turns blue-black. The liquid in the beaker remains light brown. Which statement explains these results?

• Iodine molecules diffuse through the membrane.

• Iodine molecules moves by osmosis through the membrane.

• Starch molecules diffuse through the membrane.

• Starch molecules move by osmosis through the membrane.

Which of the statements about movement of substances involve diffusion?

1. 1. movement of carbon dioxide from body cells into the blood stream;

2. 2. movement of glucose from the ileum into the bloodstream;

3. 3. movement of oxygen from the lungs into the bloodstream.

• 1 and 2 only
• 1 and 3 only
• 2 and 3 only
• 1, 2 and 3

The diagram shows a closed system in which diffusion is taking place. Which statement describes the net movement of particles X and Y?

• Both particles move to the left side.
• Both particles move to the right side.
• Particles X move to the left side and particles Y move to the right side.
• Particles X move to the right side and particles Y move to the left side.

How does oxygen move from an alveolus to a surrounding capillary in the lungs?

• by diffusion
• by osmosis
• by translocation
• by transpiration

A section through an alveolus and a blood capillary is shown? Which statement is correct?

• Oxygen moves from Q to R by diffusion.

• Oxygen moves from Q to R by osmosis.

• Oxygen moves from R to P by diffusion.

• Oxygen moves from R to P by osmosis.

How is oxygen released through the stomata of leaves?

• diffusion
• evaporation
• osmosis
• transpiration

Which statement is always correct when oxygen is diffusing out of a plant cell?

• The concentration of carbon dioxide is higher inside the cell than outside.
• The concentration of carbon dioxide is higher outside the cell than inside.
• The concentration of oxygen is higher inside the cell than outside.
• The concentration of oxygen is higher outside the cell than inside.