Class 3 Science Our Body Systems Worksheet 1
Section A: Fill in the Blanks (20 Questions)
The smallest units of life are called __________.
A group of cells that performs a particular function is called a __________.
A group of tissues that performs a particular function is called an __________.
Different organ systems work together as one __________.
The human body has __________ major organ systems.
Body parts such as hands, neck, and legs are called __________ parts of the body.
The brain, lungs, intestines, and kidneys are __________ parts of the body.
The organs of the respiratory system are nose, __________, and lungs.
The windpipe connects the __________ with the lungs.
In the lungs, the air is __________.
The process of breaking down food into simple substances is called __________.
The watery substance in the mouth that mixes with food is called __________.
The organs of the digestive system include mouth, food pipe, stomach, small intestine, large intestine, and __________.
Useful substances are absorbed from the food in the __________ intestine.
The heart is a __________ organ that pumps blood to different organs.
The two types of blood vessels are arteries and __________.
Arteries carry __________ blood from the heart to different parts of the body.
Veins carry __________ blood from different parts of the body to the heart.
The sound made by the heart pumping blood is called the heart __________.
Your heart is approximately the size of your __________.
Section B: Multiple Choice Questions (20 Questions)
What are cells called in relation to life?
- a) Building blocks
- b) Energy sources
- c) Transport units
- d) Waste products
How many major organ systems does the human body have?
- a) 8
- b) 10
- c) 12
- d) 15
Which of the following is NOT an organ system?
- a) Respiratory system
- b) Digestive system
- c) Cellular system
- d) Circulatory system
Which organ helps us to smell?
- a) Ears
- b) Eyes
- c) Nose
- d) Tongue
What does the respiratory system help us do?
- a) Digest food
- b) Breathe air in and out
- c) Pump blood
- d) Remove waste
Where does the air get cleaned in the respiratory system?
- a) Nose
- b) Windpipe
- c) Lungs
- d) Mouth
What happens to unclean air in the respiratory system?
- a) It stays in the lungs
- b) It is absorbed by blood
- c) It passes through the windpipe to the nose
- d) It is stored in the windpipe
Which system gives us energy to work and play?
- a) Respiratory system
- b) Circulatory system
- c) Digestive system
- d) Nervous system
Where does digestion of food start?
- a) Stomach
- b) Mouth
- c) Small intestine
- d) Food pipe
What mixes with food in the mouth to make it soft?
- a) Water
- b) Saliva
- c) Blood
- d) Air
Where are digestive juices mixed with food to break it down?
- a) Mouth
- b) Food pipe
- c) Stomach
- d) Large intestine
Where is digestion completed?
- a) Mouth
- b) Stomach
- c) Small intestine
- d) Large intestine
What is absorbed from undigested food in the large intestine?
- a) Nutrients
- b) Proteins
- c) Water
- d) Oxygen
What is the unwanted food removed from the body called?
- a) Waste
- b) Faeces
- c) Garbage
- d) Residue
The small intestine is approximately how many times your height?
- a) Two times
- b) Three times
- c) Five times
- d) Seven times
What does the circulatory system help circulate?
- a) Air
- b) Food
- c) Blood
- d) Water
Which organ pumps blood to different parts of the body?
- a) Lungs
- b) Heart
- c) Stomach
- d) Brain
What carries pure blood from the heart to different body parts?
- a) Veins
- b) Nerves
- c) Arteries
- d) Tissues
What carries impure blood back to the heart?
- a) Veins
- b) Arteries
- c) Nerves
- d) Organs
What type of organ is the heart?
- a) Digestive organ
- b) Respiratory organ
- c) Muscular organ
- d) Skeletal organ
Section C: True or False (20 Questions)
Cells are called the building blocks of life. __________
The human body has 12 major organ systems. __________
External parts of the body include the brain and lungs. __________
A tissue is a group of cells that performs a particular function. __________
An organ is made up of just one type of tissue. __________
The respiratory system includes the nose, windpipe, and lungs. __________
The windpipe connects the mouth with the stomach. __________
Air is cleaned in the lungs. __________
Breathing happens automatically. __________
Digestion gives us energy to work and play. __________
Saliva is a substance found in the stomach. __________
The food pipe carries food from the mouth to the stomach. __________
Useful substances are absorbed in the small intestine. __________
The large intestine is where digestion is completed. __________
Unwanted food is removed from the body through the anus. __________
The small intestine is shorter than the large intestine. __________
The circulatory system helps in the circulation of blood throughout the body. __________
Arteries carry impure blood from the heart. __________
Veins carry pure blood to the heart. __________
Your heart is approximately the size of your fist. __________
Class 3 Science Our Body Systems Worksheet 1 Answer Key
Fill in the Blanks Answers:
cells 2. tissue 3. organ 4. unit 5. 10 6. external 7. internal 8. windpipe 9. nose 10. cleaned 11. digestion 12. saliva 13. anus 14. small 15. muscular 16. veins 17. pure 18. impure 19. beat 20. fist
MCQ Answers:
a 2. b 3. c 4. c 5. b 6. c 7. c 8. c 9. b 10. b 11. c 12. c 13. c 14. b 15. c 16. c 17. b 18. c 19. a 20. c
True or False Answers:
True 2. False 3. False 4. True 5. False 6. True 7. False 8. True 9. True 10. True 11. False 12. True 13. True 14. False 15. True 16. False 17. True 18. False 19. False 20. True
