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CodeVID-M5-WS
The Human Body: Working Systems — Practice Worksheet
Chapter: The Human Body: Working Systems
Topic: The Human Body: Working Systems
Maximum Marks: 25
Time: 30 minutes
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.
Teeth help in digestion by…
  • A.Smelling
  • B.Tasting only
  • C.Chewing and breaking food
  • D.Pumping blood
2.
Most digested food is absorbed into the blood in the…
  • A.Mouth
  • B.Small intestine
  • C.Lungs
  • D.Heart
3.
Why do we say the body is like a team?
  • A.It plays cricket
  • B.Each system does its part for the whole body
  • C.It wears a jersey
  • D.It has a captain only
4.
Undigested food leaves the body as…
  • A.Saliva
  • B.Blood
  • C.Waste
  • D.Air
5.
Muscles help the body to…
  • A.Move
  • B.See
  • C.Smell
  • D.Taste
6.
Blood carries ___ and food to every part of the body.
  • A.Sand
  • B.Oxygen
  • C.Plastic
  • D.Glass
7.
When we breathe out, we give off the gas…
  • A.Salt
  • B.Oxygen
  • C.Iron
  • D.Carbon dioxide
8.
The organ that pumps blood around the body is the…
  • A.Heart
  • B.Lung
  • C.Brain
  • D.Stomach
9.
Why is it better to breathe through the nose than the mouth?
  • A.It looks better
  • B.The nose filters and warms the air
  • C.It is faster
  • D.It tastes air
10.
We breathe in mainly to take in the gas…
  • A.Smoke
  • B.Oxygen
  • C.Steam
  • D.Dust
11.
A body part that does a special job, like the heart or lungs, is an…
  • A.Island
  • B.Atom
  • C.Orbit
  • D.Organ
12.
The hard skull protects the soft…
  • A.Heart
  • B.Stomach
  • C.Brain
  • D.Liver
13.
The organ that controls the whole body and helps us think is the…
  • A.Stomach
  • B.Brain
  • C.Lung
  • D.Heart
14.
Many cells of the same kind together form a…
  • A.Star
  • B.Stone
  • C.Tissue
  • D.River
15.
The beating you feel at your wrist is your…
  • A.Yawn
  • B.Sneeze
  • C.Cough
  • D.Pulse
Section B — Challenge / Olympiad (2 marks each) 5 × 2 = 10 marks
16.
Why is it important to chew food well?
  • A.It cleans teeth only
  • B.It tastes worse
  • C.It fills the stomach with air
  • D.Smaller pieces are easier to digest
17.
Tiny living parts of blood that fight germs are the white blood…
  • A.Hairs
  • B.Bones
  • C.Nerves
  • D.Cells
18.
If one system, such as the lungs, stops working, the body suffers because the systems are…
  • A.Not important
  • B.Completely separate
  • C.Dependent on each other
  • D.Just for show
19.
A sheet of muscle below the lungs that helps us breathe in and out is the…
  • A.Rib only
  • B.Skull
  • C.Diaphragm
  • D.Heart
20.
The brain sends and receives messages through thin threads in the body called…
  • A.Bones
  • B.Nerves
  • C.Veins only
  • D.Hairs

Answer Key

Section A — Multiple Choice (1 mark each)
  1. (C) Chewing and breaking food
  2. (B) Small intestine
  3. (B) Each system does its part for the whole body
  4. (C) Waste
  5. (A) Move
  6. (B) Oxygen
  7. (D) Carbon dioxide
  8. (A) Heart
  9. (B) The nose filters and warms the air
  10. (B) Oxygen
  11. (D) Organ
  12. (C) Brain
  13. (B) Brain
  14. (C) Tissue
  15. (D) Pulse
Section B — Challenge / Olympiad (2 marks each)
  1. (D) Smaller pieces are easier to digest
  2. (D) Cells
  3. (C) Dependent on each other
  4. (C) Diaphragm
  5. (B) Nerves
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