Question 5
FA scientist placed samples of red blood cells into three solutions, X, Y and Z. Each solution had a different concentration.
The Figure shows how the red blood cells looked under a microscope after 30 minutes.
Figure
a.[1]
Name the process by which water moves into and out of the red blood cells.
b.[2]
Give the letter of the solution that was more dilute than the cytoplasm of the red blood cells.
Give a reason for your answer.
c.[2]
Explain why red blood cells can burst but plant cells do not burst.
d.[2]
Osmoregulation keeps the water concentration of the blood plasma constant.
Explain why this is important for body cells.
7.3 Homeostasis and thermoregulation Questions
44 exam-style questions on Edexcel GCSE Biology 7.3 Homeostasis and thermoregulation, covering 7.3.1 Importance of a constant internal environment, 7.3.2 Importance of homeostasis, 7.3.3a Thermoregulation via the skin and hypothalamus, and 7.3.3b Vasoconstriction and vasodilation in thermoregulation. Each one has a worked solution and a mark scheme showing where the marks go.