Respiration in Organisms MCQ Class 7 Quiz 100 MCQ

Q: What is the main purpose of respiration in organisms?

All living organisms respire to get energy from food.

Q: What is the difference between aerobic and anaerobic respiration?

Aerobic respiration uses oxygen to break down food for energy, while anaerobic respiration does not.

Q: How do plants respire?

Plants take in oxygen through stomata in their leaves and air spaces in their roots.

Q: How do fish breathe underwater?

Fish use their gills to breathe underwater.

Question 1

Question 1: Why do we need respiration?

A. To breathe airB. To smell flowersC. To get energy from food D. To make our muscles strong

Answer

C. To get energy from food.

Question 2

Question 2: What is cellular respiration?

A. The way cells talk to each otherB. The process of cells moving aroundC. The way cells reproduceD. The process of breaking down food for energy within cells

Answer

D. The process of breaking down food for energy within cells.

Question 3

Question 3: Which of these is an example of anaerobic respiration?

A. A plant making its own food through photosynthesisB. A dog panting after a long walkC. A yeast cell making alcohol D. A person breathing heavily after running

Answer

C. A yeast cell making alcohol.

Question 4

Question 4: What is the difference between aerobic and anaerobic respiration?

A. Aerobic respiration uses oxygen, anaerobic respiration does not B. Aerobic respiration happens in plants, anaerobic respiration happens in animalsC. Aerobic respiration makes carbon dioxide, anaerobic respiration makes oxygenD. There is no difference

Answer

A. Aerobic respiration uses oxygen, anaerobic respiration does not.

Question 5

Question 5: Why do we get muscle cramps after heavy exercise?

A. Because of a buildup of carbon dioxideB. Because of a buildup of lactic acid C. Because of a lack of waterD. Because of a lack of sleep

Answer

B. Because of a buildup of lactic acid.

Question 6

Question 6: Which of the following is a type of anaerobic respiration?

A. Glucose + Oxygen -> Carbon Dioxide + Water + EnergyB. Glucose -> Alcohol + Carbon Dioxide + Energy C. Glucose + Sunlight -> Oxygen + WaterD. None of the above

Answer

B. Glucose -> Alcohol + Carbon Dioxide + Energy.

Question 7

Question 7: What are anaerobes?

A. Organisms that need oxygen to surviveB. Organisms that can survive without oxygen C. Organisms that live in waterD. Organisms that live on land

Answer

B. Organisms that can survive without oxygen.

Question 8

Question 8: Where does cellular respiration take place?

A. In the airB. In the cells of all organisms C. Only in the lungsD. Only in the stomach

Answer

B. In the cells of all organisms.

Question 9

Question 9: Why is respiration important for living organisms?

A. It helps them to move.B. It helps them to grow.C. It provides them with energy. D. All of the above.

Answer

C. It provides them with energy.

Question 10

Question 10: Which gas is necessary for aerobic respiration?

A. Carbon dioxideB. NitrogenC. Oxygen D. Hydrogen

Answer

C. Oxygen.

Question 11

Question 11: What is produced during anaerobic respiration in yeast?

A. Lactic acidB. Alcohol C. WaterD. Oxygen

Answer

B. Alcohol.

Question 12

Question 12: What causes muscle cramps during heavy exercise?

A. Lack of oxygenB. Buildup of lactic acid C. Both A and BD. Neither A nor B

Answer

C. Both A and B.

Question 13

Question 13: How do we get relief from muscle cramps after exercise?

A. By drinking waterB. By taking a hot water bath or massage C. By eating foodD. By sleeping

Answer

B. By taking a hot water bath or massage.

Question 14

Question 14: What is the primary source of energy for living organisms?

A. Food B. WaterC. SunlightD. Air

Answer

D. Alcohol.

Answer

A. Cellular respiration.

Answer

C. In all organisms.

Answer

C. To release energy from food.

Answer

C. It can occur in muscle cells for a short time.

Answer

B. The process of taking in oxygen and giving out carbon dioxide.

Answer

A. Breathing in air.

Answer

B. Breathing out air.

Answer

A. Because we need more energy.

Answer

B. It decreases.

Answer

C. Playing football.

Answer

C. The lungs.

Answer

B. The windpipe.

Answer

C. The diaphragm.

Answer

A. It moves up and outwards.

Answer

B. It moves down.

Answer

A. Alveoli.

Answer

C. Oxygen is taken in and carbon dioxide is given out.

Answer

B. Carbon dioxide.

Answer

C. By passing it through lime water.

Answer

A. It turns milky.

Answer

C. Because it provides our body with the oxygen it needs.

Answer

D. To take in oxygen and give out carbon dioxide.

Answer

A. Stomach.

Answer

B. It filters, warms, and moistens the air we breathe.

Answer

C. Alveoli.

Answer

B. It makes it easier for the lungs to absorb oxygen.

Answer

B. To trap dust and germs from the air.

Answer

B. To prevent the trachea from collapsing.

Answer

B. It contracts and relaxes to change the volume of the chest cavity.

Answer

C. The volume of the chest cavity decreases.

Answer

C. To provide a continuous supply of oxygen to our cells and remove carbon dioxide.

Answer

A. Breathing rate increases with increased physical activity.

Answer

C. Through tiny holes called spiracles connected to tracheae.

Answer

B. A network of tubes that carry air throughout an insect’s body.

Answer

C. Through their skin.

Answer

C. To allow gases to dissolve and diffuse through their skin.

Answer

C. Through their gills.

Answer

B. To absorb oxygen from the water.

Answer

C. Through their lungs and skin.

Answer

B. To prevent their skin from drying out, which is necessary for breathing.

Answer

B. Insects have tracheae, while humans have lungs.

Answer

B. Earthworm.

Answer

B. To absorb oxygen from the water and transport it to the fish’s body.

Answer

A. Their gills collapse and dry out when not supported by water.

Answer

C. Both have a circulatory system to transport gases.

Answer

B. A bird in the air.

Answer

B. Because they live in different environments and have different needs.

Answer

B. All organisms use lungs to breathe.

Answer

D. All of the above.

Answer

A. Yes, they respire all the time.

Answer

B. To release energy from the food they make.

Answer

A. Through their roots and stomata.

Answer

A. Tiny holes on the surface of leaves.

Answer

C. To allow for the exchange of oxygen and carbon dioxide.

Answer

B. Through the air spaces in the soil.

Answer

C. Both release energy from food.

Answer

D. All of the above.

Answer

A. To stay alive and carry out life processes.

Answer

B. Carbon dioxide.

Answer

C. Leaves.

Answer

B. Photosynthesis.

Answer

B. They are opposite processes that complement each other.

Answer

B. They would not be able to release energy from food and would die.

Answer

C. Plants only respire at night.

Answer

B. It is the same process.

Answer

D. All of the above.

Answer

D. Both A and B.

Answer

A. To reduce water loss.

Answer

C. Having stomata.

Answer

A. Sunlight.

Answer

C. Oxygen.

Answer

B. It is used for growth, reproduction, and other life processes.

Answer

C. Amount of sunlight.

Answer

A. It provides the energy needed for the seed to sprout.

Answer

A. They cannot breathe and the buildup of carbon dioxide from respiration leads to spoilage.

Answer

A. They cannot respire and may rot.

Answer

A. It releases carbon dioxide into the atmosphere.

Answer

D. All of the above.

Answer

C. A plant.

Question 15

Question 15: Which of the following is NOT a product of aerobic respiration?

A. Carbon dioxideB. WaterC. EnergyD. Alcohol

Question 16

Question 16: What is the process of breaking down food in the cell with the release of energy called?

A. Cellular respiration B. PhotosynthesisC. DigestionD. Excretion

Question 17

Question 17: In which organisms does cellular respiration take place?

A. Only in humansB. Only in plantsC. In all organisms D. Only in animals

Question 18

Question 18: What is the main purpose of respiration?

A. To supply oxygen to the bodyB. To remove carbon dioxide from the bodyC. To release energy from food D. To help in digestion

Question 19

Question 19: Which of the following is true about anaerobic respiration?

A. It requires oxygenB. It produces more energy than aerobic respirationC. It can occur in muscle cells for a short time D. It is the primary mode of respiration in humans

Question 20

Question 20: Which of the following is an example of an organism that can survive in the absence of air?

A. HumanB. PlantC. Yeast D. Fish

Question 21

Question 21: What is breathing?

A. The process of eating foodB. The process of taking in oxygen and giving out carbon dioxide C. The process of thinkingD. The process of sleeping

Question 22

Question 22: What is inhalation?

A. Breathing in air B. Breathing out airC. Holding your breathD. Sneezing

Question 23

Question 23: What is exhalation?

A. Breathing in airB. Breathing out air C. Holding your breathD. Coughing

Question 24

Question 24: Why do we breathe faster when we run?

A. Because we need more energy B. Because we are scaredC. Because we are excitedD. Because we are bored

Question 25

Question 25: What happens to our breathing rate when we rest?

A. It increasesB. It decreases C. It stays the sameD. It stops

Question 26

Question 26: Which of these activities would make you breathe faster?

A. SleepingB. Reading a bookC. Playing football D. Watching TV

Question 27

Question 27: What is the main organ for breathing in humans?

A. The heartB. The stomachC. The lungs D. The brain

Question 28

Question 28: What is the name of the tube that carries air from our nose to our lungs?

A. The food pipeB. The windpipe C. The blood vesselD. The nerve

Question 29

Question 29: Which muscle helps us to breathe?

A. The bicepsB. The tricepsC. The diaphragm D. The quadriceps

Question 30

Question 30: What happens to our rib cage when we breathe in?

A. It moves up and outwards B. It moves down and inwardsC. It stays the sameD. It disappears

Question 31

Question 31: What happens to our diaphragm when we breathe in?

A. It moves upB. It moves down C. It stays the sameD. It disappears

Question 32

Question 32: What is the name of the tiny air sacs in our lungs?

A. Alveoli B. BronchiolesC. CapillariesD. Trachea

Question 33

Question 33: What happens in the alveoli?

A. Food is digestedB. Blood is pumpedC. Oxygen is taken in and carbon dioxide is given out D. Waste is removed

Question 34

Question 34: What is the main gas that we breathe out?

A. OxygenB. Carbon dioxide C. NitrogenD. Hydrogen

Question 35

Question 35: How can we test for the presence of carbon dioxide in exhaled air?

A. By smelling itB. By tasting itC. By passing it through lime water D. By looking at it

Question 36

Question 36: What happens to lime water when carbon dioxide is passed through it?

A. It turns milky B. It turns blueC. It turns redD. It stays the same

Question 37

Question 37: What is the percentage of oxygen in inhaled air?

A. 1%B. 10%C. 21% D. 100%

Question 38

Question 38: What is the percentage of carbon dioxide in exhaled air?

A. 0.04%B. 4% C. 21%D. 78%

Question 39

Question 39: Why is it important to breathe fresh air?

A. Because it smells goodB. Because it makes us feel happyC. Because it provides our body with the oxygen it needs D. Because it is free

Question 40

Question 40: What is the function of the respiratory system?

A. To digest foodB. To pump bloodC. To help us moveD. To take in oxygen and give out carbon dioxide

Question 41

Question 41: Which of the following is NOT a part of the human respiratory system?

A. Stomach B. LungsC. WindpipeD. Diaphragm

Question 42

Question 42: What is the role of the nasal cavity in breathing?

A. It helps to digest food.B. It filters, warms, and moistens the air we breathe. C. It pumps blood throughout the body.D. It controls our thoughts and emotions.

Question 43

Question 43: Where does the exchange of oxygen and carbon dioxide take place in the lungs?

A. TracheaB. BronchiC. Alveoli D. Diaphragm

Question 44

Question 44: Why is it important for the air we breathe to be moist?

A. It helps to prevent nosebleeds.B. It makes it easier for the lungs to absorb oxygen. C. It prevents us from getting thirsty.D. It makes our breath smell better.

Question 45

Question 45: What is the purpose of the hair and mucus in our nasal cavity?

A. To make our nose look nice.B. To trap dust and germs from the air. C. To help us smell different scents.D. To keep our nose warm.

Question 46

Question 46: What is the function of the rings of cartilage in the trachea?

A. To produce sound when we speak.B. To prevent the trachea from collapsing. C. To filter the air we breathe.D. To help us swallow food.

Question 47

Question 47: How does the diaphragm help in breathing?

A. It pumps blood to the lungs.B. It contracts and relaxes to change the volume of the chest cavity. C. It filters the air we breathe.D. It produces sound when we speak.

Question 48

Question 48: What happens when we exhale?

A. The diaphragm contracts and moves down.B. The rib cage moves up and outwards.C. The volume of the chest cavity decreases. D. Air rushes into the lungs.

Question 49

Question 49: Why do we need to breathe continuously?

A. To stay awake.B. To keep our body temperature constant.C. To provide a continuous supply of oxygen to our cells and remove carbon dioxide. D. To help us digest food.

Question 50

Question 50: What is the relationship between breathing rate and physical activity?

A. Breathing rate increases with increased physical activity. B. Breathing rate decreases with increased physical activity.C. Physical activity has no effect on breathing rate.D. Breathing rate stays constant regardless of physical activity.

Question 51

Question 51: How do insects breathe?

A. Through their lungs.B. Through their skin.C. Through tiny holes called spiracles connected to tracheae. D. Through their gills.

Question 52

Question 52: What are tracheae?

A. Tiny air sacs in the lungs.B. A network of tubes that carry air throughout an insect’s body. C. The openings on the sides of a fish’s head.D. The part of the plant that absorbs water.

Question 53

Question 53: How do earthworms breathe?

A. Through their lungs.B. Through their gills.C. Through their skin. D. Through their spiracles.

Question 54

Question 54: Why do earthworms need to stay moist to breathe?

A. To keep their skin cool.B. To prevent their skin from drying out.C. To allow gases to dissolve and diffuse through their skin. D. To help them move through the soil.

Question 55

Question 55: How do fish breathe underwater?

A. Through their lungs.B. Through their skin.C. Through their gills. D. Through their spiracles.

Question 56

Question 56: What is the function of gills in fish?

A. To help them swim.B. To absorb oxygen from the water. C. To catch food.D. To sense their surroundings.

Question 57

Question 57: How do frogs breathe?

A. Only through their lungs.B. Only through their skin.C. Through their lungs and skin. D. Through their gills.

Question 58

Question 58: Why do frogs need to live in moist environments?

A. To keep their skin cool.B. To prevent their skin from drying out, which is necessary for breathing. C. To find food.D. To lay their eggs.

Question 59

Question 59: What is the difference between the respiratory system of an insect and a human?

A. Insects have lungs, while humans have tracheae.B. Insects have tracheae, while humans have lungs. C. Insects breathe through their skin, while humans breathe through their gills.D. There is no difference.

Question 60

Question 60: Which of the following animals can breathe through its skin?

A. ElephantB. Earthworm C. FishD. Bird

Question 61

Question 61: Which of these features helps a fish to breathe in water?

A. LungsB. TracheaeC. Gills D. Skin

Question 62

Question 62: What is the function of blood vessels in the gills of a fish?

A. To help the fish swim.B. To absorb oxygen from the water and transport it to the fish’s body. C. To filter waste products from the fish’s blood.D. To help the fish sense its surroundings.

Question 63

Question 63: Why can’t fish breathe out of water?

A. Their gills collapse and dry out when not supported by water. B. They don’t have lungs.C. They can’t find any oxygen in the air.D. They get too hot out of the water.

Question 64

Question 64: Which of the following is an adaptation for breathing in a terrestrial environment?

A. GillsB. Lungs C. Moist skinD. Tracheae

Table of Contents

Introduction: The Vital Process of Respiration

The Mechanics of Breathing

Respiration in Diverse Organisms

Respiration in Plants

Most Asked Important Questions on “Respiration in Organisms”

What is the main purpose of respiration in organisms?

What is the difference between aerobic and anaerobic respiration?

How do plants respire?

How do fish breathe underwater?

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