Section A: Multiple Choice Questions (MCQs)

(Each question carries 1 mark)

1. What gives red colour to our blood?
   a) Water b) Haemoglobin c) Plasma d) Platelets

2. Which part of the blood carries oxygen to all body cells?
   a) Plasma b) WBC c) RBC d) Platelets

3. What is the main function of WBCs?
   a) Carry oxygen b) Fight germs c) Form clots d) Maintain temperature

4. Which blood vessel carries blood away from the heart?
   a) Veins b) Arteries c) Capillaries d) Lymph vessels

5. What is the normal pulse rate in humans?
   a) 50–60 b) 70–80 c) 90–100 d) 120 beats/min

6. What separates oxygen-rich and carbon dioxide-rich blood in the heart?
   a) Valves b) Septum c) Capillaries d) Veins

7. What is the main excretory product in humans?
   a) Uric acid b) Urea c) Ammonia d) Sweat

8. Which blood vessel has valves to prevent backflow?
   a) Arteries b) Veins c) Capillaries d) Pulmonary arteries

9. Which vascular tissue carries water in plants?
   a) Phloem b) Xylem c) Cork d) Cambium

10. What helps plants remove extra water?
    a) Translocation b) Transpiration c) Respiration d) Evaporation

Section B: Very Short Answer Questions (1 Mark Each)

11. Define blood.

12. Name the liquid part of blood.

13. What is the function of platelets?

14. Name the instrument used to hear the heartbeat.

15. What is the function of valves in veins?

16. Name the largest vein in the human body.

17. How many chambers does the human heart have?

18. Name the blood vessel that connects the heart and lungs.

19. Write one function of the kidneys.

20. Name two waste products excreted by humans.

Section C: Short Answer Questions (2–3 Marks Each)

21. Explain the main functions of blood.

22. Differentiate between arteries and veins.

23. Describe the structure and function of the human heart.

24. How does a stethoscope help doctors?

25. Write three differences between xylem and phloem.

26. Explain the process of urine formation in kidneys.

27. Why is the pulse rate equal to the heartbeat rate?

28. How do plants absorb water from the soil?

29. Why is transpiration called a necessary evil?

30. Why do fishes excrete ammonia and humans excrete urea?

Section D: True or False (1 Mark Each)

31. Blood platelets carry oxygen to body parts.

32. The heart has four chambers.

33. Veins carry oxygen-rich blood from the heart.

34. The kidneys purify blood by removing wastes.

35. Phloem carries food from roots to leaves.

36. Transpiration cools the plants.

37. Haemoglobin gives white colour to blood.

38. RBCs transport oxygen throughout the body.

39. WBCs protect the body from infections.

40. Xylem carries food and water both.

Section E: Application and Thinking Questions

41. Why does blood flow faster in arteries than in veins?

42. Why is sweating helpful during summer?

43. How does water rise to the top of tall trees?

44. Why do large animals need a circulatory system, but sponges do not?

45. Why do doctors measure pulse rate?

Answer Key

Section A: MCQs

1. b) Haemoglobin

2. c) RBC

3. b) Fight germs

4. b) Arteries

5. b) 70–80 beats/min

6. b) Septum

7. b) Urea

8. b) Veins

9. b) Xylem

10. b) Transpiration

Section B: Very Short Answers

11. Blood is a red fluid that transports oxygen, nutrients, and waste.

12. Plasma.

13. Platelets help in clotting of blood.

14. Stethoscope.

15. Valves prevent backward flow of blood in veins.

16. Vena cava.

17. Four chambers.

18. Pulmonary artery and pulmonary vein.

19. Kidneys remove wastes and purify blood.

20. Urea and carbon dioxide.

Section C: Short Answers

21. Blood transports oxygen, nutrients, hormones, and removes waste products.

22. Arteries: Thick walls, carry blood from heart.
      Veins: Thin walls, carry blood to heart, have valves.

23. The heart is a muscular organ with four chambers that pumps blood throughout the body.

24. A stethoscope amplifies heartbeat sounds for diagnosis.

25. Xylem: Carries water upward.
      Phloem: Carries food bidirectionally.

26. Urine forms by filtration, reabsorption, and secretion in kidneys.

27. Because every heartbeat produces one pulse in the arteries.

28. Root hairs absorb water by osmosis from the soil.

29. Transpiration removes excess water and cools the plant.

30. Fishes excrete ammonia because they live in water; humans excrete urea to save water.

Section D: True or False

31. False

32. True

33. False

34. True

35. False

36. True

37. False

38. True

39. True

40. False

Section E: Application Questions

41. Because arteries carry blood under high pressure from the heart.

42. Sweating cools the body by evaporation of water from the skin.

43. Water rises due to suction pressure created by transpiration.

44. Sponges absorb oxygen directly from water; large animals need transport systems.

45. Pulse rate shows heart activity and blood circulation health.

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