Exam-Style Questions - Carbon Cycle

Question 1

Overview:
When a plant dies, the nutrients that it contains can be recycled back into the atmosphere through nutrient cycles.
Dead organic matter contains carbon and nitrogen.

Q1.1
What are the steps of the process by which carbon in dead plants is recycled back into living plants to use in growth?

5 marks

Answer 1

1.) Carbon compounds present in dead plants are decomposed by microorganisms in the soil.
2.) Microorganisms use the carbon compounds during the process of respiration, which causes the release of energy.
3.) Carbon dioxide is produced during respiration and is released into the atmosphere.
4.) Living plants use carbon dioxide during the process of photosynthesis, which produces glucose.
5.) Glucose is utilised to synthesise proteins and cellulose, which are then used by plants to help them grow.

Question 2

Overview:
Deforestation can affect the global carbon cycle as trees are removed.
Fewer trees mean less photosynthesis and so less carbon dioxide is removed from the atmosphere.

Q1.2
How does deforestation contribute to global warming?

1 mark

Answer 2

The burning of trees and decomposition of wood increases the rate that carbon dioxide is released into the atmosphere.

Question 3

Overview:
Many people are worried about global warming.

Q1.3
Which of the following are consequences caused by global warming?

3 marks

Answer 3

1.) Increase in extreme weather events.
2.) Ocean acidification.
3.) Sea level rise.