Human & Social Biology
Advent 2025
Grade 11
Classwork 1
Name:
Date:
Section 1 - Multiple Choice (10 marks)
Read each question carefully and circle the letter option that best completes the statements
or answers each question.
1. Which substances are dissolved in human blood plasma?
A. carbon dioxide, haemoglobin and glucose
B. carbon dioxide, oxygen and haemoglobin
C. glucose, hormones and urea
D. oxygen, urea and starch
2. What is the fluid in the blood called?
A. lymph
B. mucus
C. plasma
D. tissue fluid
3. Which substance is transported by haemoglobin?
A. Nitrogen
B. Oxygen
C. Urea
D. Water
4. An example of diffusion is the movement of
A. sodium across cell membranes
B. oxygen from the alveoli to capillaries
C. glucose from the digestive tract to the villi
D. sucrose from phloem tubes to the companion cells
5. What is the life span of a red blood cell?
A. 100 days
B. 110 days
C. 120 days
D. 130 days
6. The diagram shows human blood as seen through a light microscope. A person’s blood
is unable to clot. Which component of the blood is not functioning properly?
7. In a person with a low phagocytes level, which process is slower than normal?
A. antibody formation
B. blood clotting oxygen
C. carriage
D. phagocytosis
8. The diagrams show some components of the blood of a mammal. Which component
carries out phagocytosis?
9. The red pigment found in blood is called?
A. Haenoglobin
B. Hernoglobin
C. Haemoglobin
D. Hepmoglobin
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Section B: Short Answer
1. Describe two features of a red blood cell and explain how each feature helps it carry out its
function.(2 marks)
2. Explain why diffusion alone is not sufficient for transport in the human body. (2 marks)
3. What is the function of lymphocytes, and how are they adapted to perform it? (3 marks)
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