ICSE Class 6 Biology - Circulatory System - Test 4 (Expert)
1. The circulatory system is active even when a person is:
A. Eating food
B. Sleeping
C. Running only
2. During exercise, the heart beats:
A. Faster
B. Stops
C. Slower
3. Blood in arteries flows under:
A. No pressure
B. Low pressure
C. High pressure
4. The main role of veins is to carry blood:
A. Away from heart
B. Toward heart
C. Only oxygen
5. Capillaries are important because they are:
A. Very thin vessels
B. Thick tubes
C. Pumping organs
6. Oxygen is carried in blood by:
A. Platelets
B. Plasma
C. Red blood cells
7. White blood cells are responsible for:
A. Clotting blood
B. Fighting germs
C. Carrying oxygen
8. Platelets mainly help in:
A. Blood clotting
B. Digestion
C. Breathing
9. Plasma carries mainly:
A. Only oxygen
B. Only RBCs
C. Dissolved substances
10. The heartbeat is controlled by:
A. Heart muscles
B. Bones
C. Lungs
11. Blood circulation means:
A. Food digestion
B. Continuous blood flow
C. Air intake only
12. Arteries mainly transport blood:
A. Toward heart
B. Only in lungs
C. Away from heart
13. Valves in veins prevent:
A. Backward flow
B. Oxygen transport
C. Digestion
14. Capillaries help in:
A. Pumping blood
B. Exchange of substances
C. Making blood
15. The heart is best described as a:
A. Bone structure
B. Digestive organ
C. Muscular pump
16. The main role of RBCs is:
A. Oxygen transport
B. Clotting
C. Digestion
17. White blood cells increase during:
A. Sleeping
B. Infection
C. Digestion
18. Blood vessels form a:
A. Digestive tube
B. Respiratory organ
C. Network system
19. Good circulation ensures:
A. Oxygen supply to cells
B. No breathing
C. No digestion
20. The circulatory system is important because it:
A. Stops digestion
B. Maintains life processes
C. Produces food