Respiration

Question 1

What is respiration and how does it release energy?

Answer 1

Respiration is a chemical reaction which releases energy from glucose with or without oxygen, the products of this reaction are also carbon dioxide and water

The energy is released in the form of ATP

Question 2

What is the function of ATP?

Answer 2

To provide energy for cells

Examples include:
Mainting a constant body temperature
Cell division and growth
Active Transport
Muscular contractions

Question 3

What are the differences between aerobic and anaerobic respiration?

Answer 3

Aerobic requires oxygen, anaerobic does not

Aerobic produces alot of energy, anareobic produces little energy

Aerobic completely breaks down the glucose, anaerobic does it incompletely

The products differ

Aerobic will happen when there is abundant oxygen, anaerobic will happen when there is insufficient oxygen

Question 4

What is the word equation for aerobic respiration in all living organisms?

Answer 4

Oxygen + Glucose –> Carbon Dioxide + Water

Question 5

What is the balanced symbol equation for aerobic respiration in all living organisms?

Answer 5

6O₂ + C₆H₁₂O₆ –> 6CO₂ + 6H₂O

Question 6

What is the word equation for anaerobic respiration in animals?

Answer 6

Glucose —> Lactic acid

Question 7

What is the word equation for anaerobic respiration in plants and fungi?

Answer 7

Glucose —> Carbon dioxide + Ethanol

Question 8

Outline an investigation into the release of carbon dioxide from respiration

Answer 8

Put 10 germinating seeds in one test tube, 10 dead seeds in another, and 10 glass beeds in another

Add hydrogencarbonate indicator to each test tube, and seal it off

Wait 3 hours, and then observe the colour of the indicator

The hydrogencarbonate in the tube with the germinating seeds should be yellow, as carbon dioxide was released, and in the other 2 test tubes it should be orange/red as there was no change in carbon dioxide concentration

Question 9

Outline an investigation of heat release from respiration

Answer 9

Seal dead seeds, in one flask, and germinating seeds in another with thermometers in each

Record the initial temperature, and wait 4 days

Record the final temperature

You should see that the flask with the germinating seeds experienced a large temperature increase an respiration is an exothermic reaction but the other flask did not