Vidaara.orgClass 11 · Mathematics
CodeVID-M11-WS
Body Fluids and Circulation — Practice Worksheet
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Choose the correct option (A, B, C or D) for each question.
- The answer key is at the end — try the paper first!
Section A — Multiple Choice (1 mark each)
15 × 1 = 15 marks
1.
The liquid part of blood is called:
- A.Plasma
- B.Serum only
- C.Lymph
- D.Bile
2.
Oxygen is carried mainly by:
- A.White blood cells
- B.Red blood cells
- C.Platelets
- D.Plasma proteins
3.
Cells that defend the body against germs are:
- A.Red blood cells
- B.White blood cells
- C.Platelets
- D.Nerve cells
4.
Blood clotting is helped by:
- A.RBCs
- B.Platelets
- C.Plasma water
- D.WBCs only
5.
The universal recipient blood group is:
- A.O
- B.A
- C.B
- D.AB
6.
A colourless body fluid with no RBCs that bathes the cells is:
- A.Bile
- B.Lymph
- C.Urine
- D.Saliva
7.
The human heart has how many chambers?
- A.Two
- B.Three
- C.Four
- D.Five
8.
The upper chambers of the heart are the:
- A.Ventricles
- B.Atria
- C.Valves
- D.Arteries
9.
Heart valves mainly:
- A.Make blood
- B.Prevent back-flow of blood
- C.Filter blood
- D.Store blood
10.
Passage of blood through the heart twice in one round is called:
- A.Single circulation
- B.Double circulation
- C.Open circulation
- D.No circulation
11.
Vessels that carry blood back to the heart are:
- A.Arteries
- B.Veins
- C.Capillaries
- D.Lacteals
12.
Exchange of materials between blood and cells happens in the:
- A.Arteries
- B.Veins
- C.Capillaries
- D.Atria
13.
The contraction phase of the heart is called:
- A.Diastole
- B.Systole
- C.Lymph
- D.Plasma
14.
Persistently high blood pressure is called:
- A.Hypertension
- B.Anaemia
- C.Jaundice
- D.Diabetes
15.
Sudden blockage of blood supply to part of the heart muscle is a:
- A.Heart attack
- B.Common cold
- C.Fracture
- D.Allergy
Section B — Challenge / Olympiad (2 marks each)
6 × 2 = 12 marks
16.
The left ventricle has the thickest wall because it must:
- A.Pump blood to the whole body
- B.Receive blood from the lungs
- C.Store blood
- D.Make blood cells
17.
Double circulation is efficient because it keeps:
- A.Oxygen-rich and oxygen-poor blood separate
- B.All blood the same
- C.The heart from beating
- D.Lungs from working
18.
Veins have valves but most arteries do not because:
- A.Vein blood flows slowly at low pressure and could flow backward
- B.Veins carry no blood
- C.Arteries are thinner
- D.Arteries are colourless
19.
Before a blood transfusion, blood groups must be matched to avoid:
- A.Clumping (agglutination) of red cells
- B.Faster digestion
- C.More oxygen
- D.Higher immunity
20.
Atherosclerosis raises the risk of a heart attack because narrowed arteries:
- A.Reduce blood flow to the heart muscle
- B.Increase oxygen to the heart
- C.Make more platelets
- D.Widen over time
21.
The 'lub-dub' heart sounds are produced by:
- A.The closing of heart valves
- B.Blood entering the lungs
- C.Breathing
- D.Digestion
Answer Key
Section A — Multiple Choice (1 mark each)
- (A) Plasma
- (B) Red blood cells
- (B) White blood cells
- (B) Platelets
- (D) AB
- (B) Lymph
- (C) Four
- (B) Atria
- (B) Prevent back-flow of blood
- (B) Double circulation
- (B) Veins
- (C) Capillaries
- (B) Systole
- (A) Hypertension
- (A) Heart attack
Section B — Challenge / Olympiad (2 marks each)
- (A) Pump blood to the whole body
- (A) Oxygen-rich and oxygen-poor blood separate
- (A) Vein blood flows slowly at low pressure and could flow backward
- (A) Clumping (agglutination) of red cells
- (A) Reduce blood flow to the heart muscle
- (A) The closing of heart valves
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