Respiration

Question 1

Complete the sentence:

Living organisms require________ to survive.

Answer 1

Energy

Question 2

Name a key difference between respiration and photosynthesis.

Answer 2

Only green plants photosynthesise, while all living organisms respire.

Question 3

Briefly describe the process of respiration.

Answer 3

Plants and animals break down glucose and oxygen to produce carbon dioxide, water and energy.

Question 4

Give the chemical equation for respiration.

Answer 4

glucose + oxygen ———> energy + carbon dioxide + water

Question 5

Give an example of photosynthesis and respiration using a cow, grass and a tree.

Answer 5

1. Tree produces oxygen
2. Cow takes in oxygen
3. Cow eats grass
4. Cow breaks down the sugar molecules (Glucose) from
   the grass
5. Cow releases carbon dioxide
6. Tree takes in carbon dioxide
7. Tree uses carbon dioxide to make sugar molecules,
   and let off more oxygen.

Question 6

How can photosynthesis and respiration be described as opposite processes?

Answer 6

During respiration, food is broken down and energy is released.
During photosynthesis, plants use the energy from the Sun to produce food.