CIE iGCSE Co-Ordinated Science B3.1 Diffusion Exam Style Questions Paper 1
Question
Which statements about osmosis are correct?
1 Osmosis requires a membrane.
2 Water can move out of cells by osmosis.
3 Water can move into cells by osmosis.
A 1 and 2 only B 1 and 3 only C 1, 2 and 3 D 2 and 3 only
▶️Answer/Explanation
Ans :C
Question
By which process does oxygen pass from the alveoli to the blood capillaries in the lungs?
(A) growth and nutrition
(B) growth and sensitivity
(C) respiration and nutrition
(D) respiration and sensitivity
▶️Answer/Explanation
Ans: A
Question
What is an example of diffusion?
A. movement of blood through the capillaries
B. movement of food from the mouth to the stomach
C. movement of oxygen from alveoli to the blood
D. movement of urine along the urethra
▶️Answer/Explanation
Answer: C. movement of oxygen from alveoli to the blood
Explanation: Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. The movement of oxygen from the alveoli (high concentration) to the blood (low concentration) is an example of diffusion.
Question
What is the net movement of molecules during diffusion?
A. from a higher concentration to a lower concentration down a concentration gradient
B. from a higher concentration to a lower concentration up a concentration gradient
C. from a lower concentration to a higher concentration down a concentration gradient
D. from a lower concentration to a higher concentration up a concentration gradient
▶️Answer/Explanation
Answer: A. from a higher concentration to a lower concentration down a concentration gradient
Explanation: Diffusion is the net movement of molecules from an area of higher concentration to an area of lower concentration, down a concentration gradient. This process occurs due to the random motion of particles.