Respiration

Question 1

Aerobic respiration equation :

Answer 1

Glucose + oxygen -> carbon dioxide + water + ATP (energy)

Question 2

Demostrating carbon dioxide production:

Answer 2

Sodalime in a container, as it absorbs carbon dioxide from the air, so limewater will remain clear
Germinating seeds in another container as it produced carbon dioxide as a product, the limewater will turn cloudy

Question 3

Demonstrating energy release:

Answer 3

By increasing the thermal energy in Beaker B (with the boiled seeds), we see that the enzymes are denatured ; this prevents ATP from being produced. This prevents respiration from occurring. In Beaker A (germinating seed), there is no heat so respiration occurs.

Question 4

What is the purpose of boiling seeds in the experiments demonstrating energy release?

Answer 4

For comparison and control experiments

Question 5

Respiration in cells:

Answer 5

Mitochondria

Question 6

Mitochindria found in:

Answer 6

Muscle and sperm cells

Question 7

Effects of excercise on the body: Breathing rate…

Answer 7

Increases

Question 8

Effects of excercise on the body : Depth of breath…

Answer 8

Increases, as:

• more oxygen taken in
• allows increase in oxygen level in blood
• also : more carbon exhaled

Question 9

Effects of excercise on the body : Heart rate…

Answer 9

Increases, as

• increase blood flow to muscles
• more oxygen and glucose delivered
• allows increase in respiration + thus increase in energy release

Question 10

Effects of excercise on the body : feeling …

Answer 10

Hotter

• not all the energy is released in respiration is converted into kinetic energy (muscle movement)
• some is lost as heat

Question 11

The changes that occur after excercising regularly

Answer 11

• Amount of blood pumped out of the heart during each beat and heart volume increases
• Breathing rate and pulse rate decreases

Question 12

Why does breathing and pulse rate drop?

Answer 12

• as a result heart being bigger and more blood being pumped out, one does not need to breath as much as is released in every breath

Question 13

Anaerobic respiration :

Answer 13

Respiration that occurs, despite the abscence of oxygen

Question 14

Anaerobic Respiration : Equation

Answer 14

Glucose -> Ethanol + Carbon Dioxide

Question 15

Oxygen debt

Answer 15

= the additional oxygen that must be taken in after vigorous excercise for the body to ‘respire’. The lactic acid requires oxidisation (lactic acid + oxygen -> carbon dioxide + water