Breathing and Respiration

Question 1

definition of respiration

Answer 1

the release of energy in the form of ATP from food that occurs in every living cell all of the time

Question 2

aerobic respiration

Answer 2

glucose + oxygen -> carbon dioxide + water (energy/ATP)
C6H1206+602 -> 6C02+6H20

Question 3

anaerobic respiration (animals)

Answer 3

Glucose -> Lactic acid (+ a little energy /ATP)
- occurs in the cytoplasm when there isn’t sufficient oxygen

Question 4

anaerobic respiration (plants and fungi)

Answer 4

Glucose -> ethanol + carbon dioxide (A little energy/ATP)

Question 5

respiration experiments - testing for C02 using limewater

Answer 5

• limewater can be used to test for C02
• if the limewater turns cloudy then carbon dioxide is present

Question 6

respiration experiments - testing for C02 using hydrogen carbonate

Answer 6

• hydrogen carbonate indicator is normally orange but turns yellow if there are high levels of C02 present
• low levels of C02 will turn the indicator purple

Question 7

respiration experiments - production of carbon dioxide by small living organisms

Answer 7

• small organisms cab be placed in a boiling tube on a gauze to stop them coming into contact with the chemical
• hydrogen carbonate indicator or limewater can be used to test the presence pf C02 during respiration

Question 8

respiration experiments - testing the gas produced in anaerobic respiration using limewater or hydrogen carbonate

Answer 8

• the yeast have been cut off from their oxygen supply to prove that anaerobic respiration is taking place
• hydrogen carbonate indicator or limewater can be used to test the presence of C02

Question 9

respiration experiments - evidence that heat is produced during respiration

Answer 9

• the germinating seeds are respiring and therefore releasing heat
• the boiled seeds have been killed and therefore not respiring anymore