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Cellular Respiration

In this worksheet, students will learn about respiration (aerobic and anaerobic), this is the reaction our body uses to make its energy.

Key stage:  KS 3

Curriculum topic:  Biology: Material Cycles and Energy

Curriculum subtopic:  Cellular Respiration

Difficulty level:  

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QUESTION 1 of 10

Cells of all organisms need energy to stay alive and perform all processes of life. Both plants and animals, as well as micro-organisms, respire all the time. Our cells respire even when we are asleep. When we eat carbohydrates (pasta, rice, bread, potatoes) our body breaks them down to glucose. Glucose reacts with the oxygen that we breathe in and energy is released. This process is called respiration. The chemical equation of respiration is shown below:

 

oxygen + glucose → carbon dioxide + water + ENERGY

 

Carbon dioxide is breathed out of our body as it is not needed and it is harmful as well. Water is a waste product, too. It is also breathed out. You can see that on a cold day; when you breathe out on a window, the steam you breathe out condenses to water and you can see that on the glass. Respiration also releases heat energy, as it is a very controlled form of burning. Respiration that uses oxygen is called aerobic respiration.

One must be careful not to confuse respiration with breathing. Breathing is needed for the cells to obtain oxygen, but there is so much more to respiration, as mentioned above.

 

During exercise our lungs take oxygen from the air as we breathe. If the oxygen we need is more than our lungs can take, we get tired quickly and we are not able to exercise for long. When it is not possible to obtain enough oxygen, our cells start to use anaerobic respiration. Anaerobic means 'without oxygen'; glucose is broken down into lactic acid without using oxygen. You can see the chemical equation below:

 

glucose → lactic acid + ENERGY

 

Anaerobic respiration does not release as much energy as aerobic respiration, because not all of the energy from glucose can be released. Lactic acid has some energy in it, but it cannot be used for long, as it is poisonous. When we stop exercising our body still tries to get oxygen for aerobic respiration to break down the lactic acid that has formed. The amount of oxygen needed for this is called oxygen debt.

 

Humans have taken advantage of anaerobic respiration in some micro-organisms (yeast) to produce alcoholic drinks, beer and wine. This process is called fermentation. The chemical equation for fermentation is:

 

glucose → ethanol (alcohol) + carbon dioxide

What do all cells need to stay alive?

Type one word.

What substance do our cells take from the food we eat in order to respire?

glucose

oxygen

water

What gas do we breathe in so that our cells can respire?

carbon dioxide

oxygen

water

Name a poisonous waste product of respiration.

oxygen

water

carbon dioxide

What types of living organisms respire?

Tick three boxes.

plants

only animals

only plants

micro-organisms

only plants and micro-organisms

animals

Is this statement true or false?

Water is a useful product of respiration.

true

false

Is this statement true or false?

Breathing is the same as respiration.

true

false

When our cells do not have access to enough oxygen, they start using respiration without oxygen. What do we call this type of respiration?

Type one word.

During anaerobic respiration glucose is broken down without oxygen. What is the product?

water

galactic acid

lactic acid

After exercise, cells respire aerobically to break down the lactic acid formed during anaerobic respiration. What do we call the amount of oxygen needed to do that?

oxygen pant

oxygen breath

oxygen debt

  • Question 1

What do all cells need to stay alive?

Type one word.

CORRECT ANSWER
energy
EDDIE SAYS
All cells need energy in order to stay alive.
  • Question 2

What substance do our cells take from the food we eat in order to respire?

CORRECT ANSWER
glucose
EDDIE SAYS
Glucose is provided to cells from the food we eat.
  • Question 3

What gas do we breathe in so that our cells can respire?

CORRECT ANSWER
oxygen
EDDIE SAYS
We breathe in oxygen, so our cells can have the oxygen they need for respiration.
  • Question 4

Name a poisonous waste product of respiration.

CORRECT ANSWER
carbon dioxide
EDDIE SAYS
Carbon dioxide is a poisonous gas that we breathe out as a waste product of respiration.
  • Question 5

What types of living organisms respire?

Tick three boxes.

CORRECT ANSWER
plants
micro-organisms
animals
EDDIE SAYS
All living organisms, plants, animals and micro-organisms respire.
  • Question 6

Is this statement true or false?

Water is a useful product of respiration.

CORRECT ANSWER
false
EDDIE SAYS
The statement is false; water is a product of respiration, but it is waste, so our body breathes it out.
  • Question 7

Is this statement true or false?

Breathing is the same as respiration.

CORRECT ANSWER
false
EDDIE SAYS
The statement is false; breathing is needed for respiration, so our body can obtain oxygen, as well as breathe out carbon dioxide. However, respiration is the chemical reaction between glucose and oxygen to release energy.
  • Question 8

When our cells do not have access to enough oxygen, they start using respiration without oxygen. What do we call this type of respiration?

Type one word.

CORRECT ANSWER
anaerobic
EDDIE SAYS
Anaerobic respiration is respiration without oxygen.
  • Question 9

During anaerobic respiration glucose is broken down without oxygen. What is the product?

CORRECT ANSWER
lactic acid
EDDIE SAYS
Lactic acid is produced during anaerobic respiration.
  • Question 10

After exercise, cells respire aerobically to break down the lactic acid formed during anaerobic respiration. What do we call the amount of oxygen needed to do that?

CORRECT ANSWER
oxygen debt
EDDIE SAYS
The amount of oxygen needed to break down lactic acid after anaerobic respiration is called oxygen debt.
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