Aerobic and Anaerobic Respiration

Question 1

Why is cellular respiration an exothermic
reaction?

Answer 1

Respiration releases energy – it is an exothermic process.

Question 2

Explain how the energy transferred by respiration
in cells is used by the organism.

Answer 2

-The chemical reactions to build carbohydrates, proteins and lipids
from the products of digestion in animals, require energy
-Movement – in animals, energy is needed to make muscles
contract

Question 3

Name 2 differences between aerobic and anaerobic respiration

Answer 3

-Aerobic requires oxygen
-Anaerobic is without oxygen
-Products of anaerobic is lactic acid in muscles
-Products of aerobic is carbon dioxide and water

Question 4

Word equation to represent aerobic
respiration.

Answer 4

glucose + oxygen → carbon dioxide + water + energy released

Question 5

Word equation to represent anaerobic
respiration in muscles.

Answer 5

glucose → lactic acid + energy released

Question 6

Explain the difference in the amount of energy
transferred in anaerobic respiration compared to
aerobic respiration.

Answer 6

The amount of energy released in aerobic is a relatively large amount whilst the energy released in anaerobic is a small amount but it is released quickly.

Question 7

Write a word equation to represent anaerobic
respiration in plant and yeast cells.

Answer 7

glucose → ethanol + carbon dioxide + energy released