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Respiration

In this worksheet, students will explore the role of respiration in the release of energy and function of organisms.

Worksheet Overview

QUESTION 1 of 10

By now, you should be getting the idea that living things are just a bunch of chemical reactions all designed to help that thing live. Well, now we will be looking at the most important chemical reaction of all - respiration. Without this chemical reaction, there would be no life - everything that we know that is alive relies on this reaction in one form or another. it allows us to run marathons and plants to make fruit. It also makes alcohol and bread rise. it is an amazing reaction. It is respiration. 

 

Cells in all organisms need to utilise glucose and oxygen to release the energy they need to perform any function. The chemical equation of respiration is:

 

glucose + oxygen carbon dioxide + water + energy

 

Aerobic respiration uses oxygen. Anaerobic respiration releases energy from glucose taken from food, without the presence of oxygen. In this case, the equation looks like this:

 

glucose lactic acid + energy

 

The energy released through anaerobic respiration is much less than aerobic, but the body does need to use it when oxygen supply is not quick enough. This is called oxygen debt and it happens during intensive exercise. Lactic acid causes temporary damage to muscles, causing them to become painful. At the end of intensive exercise, our breathing rate increases to replace oxygen and pulse rate also increases to carry lactic acid away from the muscles to be broken down in the liver.

 

Plants, like animals, respire 24 hours a day to stay alive. They use the glucose and the oxygen produced during photosynthesis to release energy. The equation for respiration is the reverse of photosynthesis.

What process do cells use to release energy for their functions?

What are the reactants of respiration? Select two boxes.

Water

Glucose

Carbon dioxide

Oxygen

What are the products of respiration? Select two boxes.

Water

Carbon dioxide

Oxygen

Glucose

Carbon dioxide is a waste gas, so our body has to let it out. Choose the statement that explains how this is done.

Carbon dioxide is excreted through urine.

Carbon dioxide is excreted in sweat.

We breath carbon dioxide out of the body.

What is the product of anaerobic respiration?

Fatty acids

Hydrochloric acid

Lactic acid

Tick one difference between aerobic and anaerobic respiration.

There is no oxygen involved in aerobic respiration

There is no oxygen involved in anaerobic respiration

Glucose is not produced during anaerobic respiration

Complete the following sentence by selecting one of the options below:

 

Muscles hurt after intensive exercise because.......

Too much glucose has been used.

Lactic acid has accumulated in the muscles.

No oxygen was available for respiration.

The body goes into anaerobic respiration because oxygen is not supplied fast enough. What is this state called?

Oxygen deficiency

Oxygen credit

Oxygen debt

What increases during and after intensive exercise? Tick two boxes.

Pulse rate

Carbon dioxide supply

Breathing rate

Glucose break down

Is the following statement true or false?

 

Plants only respire during night time, when photosynthesis does not take place.

True

False

  • Question 1

What process do cells use to release energy for their functions?

CORRECT ANSWER
respiration
EDDIE SAYS
Cells release energy through respiration. This happens in the cytoplasm and the mitochondria of plant and animal cells.
  • Question 2

What are the reactants of respiration? Select two boxes.

CORRECT ANSWER
Glucose
Oxygen
EDDIE SAYS
The reactants of respiration are glucose and oxygen. Reactants are things that make a reaction happen whereas products are what the reaction makes.
  • Question 3

What are the products of respiration? Select two boxes.

CORRECT ANSWER
Water
Carbon dioxide
EDDIE SAYS
Carbon dioxide and water are produced during respiration, as well as energy. Products are what a reaction makes, unlike the reactants we had in the last question.
  • Question 4

Carbon dioxide is a waste gas, so our body has to let it out. Choose the statement that explains how this is done.

CORRECT ANSWER
We breath carbon dioxide out of the body.
EDDIE SAYS
We breathe in air containing oxygen and breath out air with 4% less oxygen in it. The carbon dioxide level has gone up for nearly 0% to just over 4%. The oxygen has been replaced with carbon dioxide in the air.
  • Question 5

What is the product of anaerobic respiration?

CORRECT ANSWER
Lactic acid
EDDIE SAYS
Lactic acid is produced during anaerobic respiration. This is because the cells don't have enough oxygen to do respiration in the mitochondria, so it only happens in the cytoplasm. This releases less energy, but it useful in a pinch.
  • Question 6

Tick one difference between aerobic and anaerobic respiration.

CORRECT ANSWER
There is no oxygen involved in anaerobic respiration
EDDIE SAYS
There is no oxygen involved in anaerobic respiration. It releases less energy but can be sued in places where there is less oxygen, but respiration still needs to take place (e.g. with bacteria in stagnant water).
  • Question 7

Complete the following sentence by selecting one of the options below:

 

Muscles hurt after intensive exercise because.......

CORRECT ANSWER
Lactic acid has accumulated in the muscles.
EDDIE SAYS
Muscles hurt after intensive training, because lactic acid has accumulated in the muscles. The heart rate then quickens to pump the lactic acid away from the muscles to be broken down in the liver.
  • Question 8

The body goes into anaerobic respiration because oxygen is not supplied fast enough. What is this state called?

CORRECT ANSWER
Oxygen debt
EDDIE SAYS
When oxygen is not supplied fast enough, the body goes into anaerobic respiration. This is called oxygen debt because the body needs to use up oxygen to get rid of the lactic acid that has built up.
  • Question 9

What increases during and after intensive exercise? Tick two boxes.

CORRECT ANSWER
Pulse rate
Breathing rate
EDDIE SAYS
Pulse rate and breathing rate increase during and after intensive exercise. Pulse rate quickens to move the lactic acid away from the muscles to the liver, and breathing rate quickens to allow more oxygen into the body.
  • Question 10

Is the following statement true or false?

 

Plants only respire during night time, when photosynthesis does not take place.

CORRECT ANSWER
False
EDDIE SAYS
All organisms, including plants, respire all the time. As we said in the beginning - it is the most important reaction there is in all living things.
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