Nitrogen cycle — key processes — fill in the table
Process
What happens
Nitrogen fixation
Decomposition
Nitrification
Denitrification
Nitrate absorption
Exam questions — 3 questions · 10 marks total
⚡ This module includes extended questions (4–6 marks). These are where most marks are lost. Read the hint carefully. Write in linked sentences. The AI will identify exactly which mark scheme points you missed.
1 markDecomposersAQA 8461 style
What is the role of decomposers in the carbon cycle?
A They convert carbon dioxide into glucose
B They break down dead organic matter, releasing carbon dioxide through respiration
C They absorb carbon from the soil into their cells
D They produce oxygen from carbon dioxide
6 marksDescribe the carbon cycleAQA Jun 2023 P2 Q4 — real 6-mark question
Describe how carbon is cycled between living organisms and the atmosphere. (6 marks)
Hint: Trace carbon through the whole cycle: CO₂ → photosynthesis → plant glucose → eaten by animals → respiration → CO₂. Include decomposers and combustion for Level 3.
+60 XP
3 marksNitrogen cycleAQA 8461 style
Describe the role of bacteria in the nitrogen cycle. Name at least two different types of bacteria and explain what each does. (3 marks)
Hint: Name the type of bacteria, then say exactly what they convert and what they produce.