Respiration

Question 1

Aerobic respiration word equation?

Answer 1

Glucose + Oxygen → Carbon Dioxide + Water

Question 2

How is energy released in respiration?

Answer 2

Energy is released from glucose either in the presence of oxygen (aerobic respiration) or the absence of oxygen (anaerobic respiration)

Question 3

What is ATP?

Answer 3

ATP is the form of energy that is transferred during respiration?

Question 4

What do organisms need energy for?

Answer 4

• Chemical reactions to build larger molecules from smaller molecules/
• Muscle contraction to allow movement
• Keeping warm (to maintain a constant temperature suitable for enzyme activity)

Question 5

What is type of reaction is cellular respiration?

Answer 5

• An exothermic reaction that is continuously occurring in living cells

Question 6

Is glucose breakdown complete in aerobic respiration?

Answer 6

Yes

Question 7

Is glucose breakdown complete in anaerobic respiration?

Answer 7

No

Question 8

Which releases more energy: aerobic or anaerobic respiration?

Answer 8

aerobic respiration

Question 9

Aerobic respiration chemical equation?

Answer 9

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂0

Question 10

Aerobic respiration definition?

Answer 10

The chemical reaction in cells that uses oxygen to break down nutrient molecules to release energy

Question 11

Anaerobic respiration definition?

Answer 11

The chemical reaction in cells that breaks down nutrient molecules to release energy without using oxygen

Question 12

When does anaerobic respiration take place in animals?

Answer 12

• Anaerobic respiration mainly takes place in muscle cells during vigorous exercise.
• When we exercise at high intensities, our muscles have a higher demand for energy
• Our bodies can only deliver so much oxygen to our muscle cells for aerobic respiration

Question 13

Anaerobic respiration in animals word equation?

Answer 13

Glucose → Lactic acid

Question 14

Anaerobic respiration in animals chemical equation?

Answer 14

C₆H₁₂O₆ → 2C₃H₆0₃

Question 15

What is lactic acid?

Answer 15

• Lactic acid builds up in muscle cells and lowers the pH of the muscle tissue.
• Acidic conditions can denature the enzymes in cells
• Lactic acid will eventually be broken down using oxygen to produce carbon dioxide and water as waste products
• The amount of oxygen required to break down the lactic acid that has built up is referred to as the ‘oxygen debt’
• The process of breaking down the lactic acid is known as ‘repaying the oxygen debt’

Question 16

What is anaerobic respiration in yeast cells?

Answer 16

fermentation

Question 17

Anaerobic respiration in yeast cells word equation?

Answer 17

Glucose → Ethanol + Carbon dioxide

Question 18

Anaerobic respiration in yeast cells chemical equation?

Answer 18

C₆H₁₂O₆ → 2C₂H₅0H + 2CO₂

Question 19

What experiments can we do to investigate the production of carbon dioxide and heat from respiration?

Answer 19

• Experiments using germinating seeds or other living organisms such as woodlice.

Question 20

What are the colour changes for the Hydrogencarbonate indicator

Answer 20

• Orange in atmospheric CO2 levels
• In high CO2 levels the indicator absorbs the CO2 and becomes yellow
• In low CO2 levels it loses CO2 and becomes purple