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
