Respiration and Breathing in Living Organisms

Biology

This content explains the fundamental processes of respiration and breathing in living organisms, distinguishing between them and outlining their importance for survival. It also describes different mechanisms of gas exchange in animals, such as through the skin in earthworms.

respiration breathing gas exchange

20 Questions Easy Ages 8+ Jan 26, 2026

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About this Study Set

This study set covers Biology through 20 practice questions. This content explains the fundamental processes of respiration and breathing in living organisms, distinguishing between them and outlining their importance for survival. It also describes different mechanisms of gas exchange in animals, such as through the skin in earthworms. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

Questions & Answers

Browse all 20 questions from the Respiration and Breathing in Living Organisms study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 What is the process of taking in oxygen-rich air into the body called?

A Exhalation
B Respiration
C Inhalation
D Breathing

2 What is the process of giving out air with more carbon dioxide called?

A Inhalation
B Breathing
C Respiration
D Exhalation

3 What are inhalation and exhalation collectively called?

A Respiration
B Gas exchange
C Breathing
D Energy release

4 What is respiration defined as?

A The release of carbon dioxide
B The process of using oxygen to break down food and release energy
C Taking in oxygen-rich air
D Giving out carbon dioxide-rich air

5 Why is respiration also called the universal chemical process?

A Because it only occurs in plants
B Because every living cell respires to survive
C Because it is a physical process
D Because it is only extracellular

6 Which of the following is NOT a characteristic of respiration?

A Release of energy
B Intracellular process
C Breakdown of digested food
D No release of energy

7 Which of the following is a characteristic of breathing?

A Release of energy
B Intracellular process
C Extracellular process
D Biochemical process

8 In which animals does gas exchange take place through the skin?

A Birds
B Fish
C Earthworms and leeches
D Mammals

9 What allows gaseous exchange in the skin of earthworms?

A Scales
B Hair follicles
C The skin walls and blood vessels
D Feathers

10 Where does respiration primarily take place in the body?

A Outside the cells
B In the lungs only
C Inside the cells
D In the blood vessels

11 What is the primary function of oxygen inhaled during breathing?

A To release carbon dioxide
B To break down food and release energy
C To cool the body
D To increase the volume of air inhaled

12 What are the byproducts of respiration mentioned in the text?

A Oxygen and water
B Carbon dioxide and water
C Glucose and oxygen
D Nitrogen and carbon dioxide

13 What is the main difference between respiration and breathing regarding energy?

A Respiration releases energy, breathing does not
B Breathing releases energy, respiration does not
C Both release energy
D Neither releases energy

14 How is breathing described in terms of its location?

A Intracellular
B Extracellular
C Both intracellular and extracellular
D In the bloodstream

15 What type of process is respiration?

A Physical
B Chemical
C Mechanical
D Atmospheric

16 What type of process is breathing?

A Biochemical
B Chemical
C Physical
D Metabolic

17 What does the blood transport in earthworms related to gas exchange?

A Food particles
B Waste products
C Gases
D Water

18 What is the role of the slimy surface of the skin in earthworms and leeches for respiration?

A To absorb water
B To prevent drying out
C To allow gaseous exchange
D To store food

19 Which of the following is vital for the survival of living things according to the text?

A Digestion and excretion
B Breathing and respiration
C Movement and reproduction
D Growth and development

20 In earthworms, the skin is rich in what to aid in gas transport?

A Nerves
B Muscles
C Blood vessels
D Cartilage

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