Some carbon atoms in a dead leaf later become part of the glucose in a new leaf on another plant.
The dead leaf is broken down by microorganisms in well-aerated soil.
Which sequence correctly traces these carbon atoms?
Microorganisms release carbon dioxide by respiration; the new leaf takes in this gas and uses it in photosynthesis.
Microorganisms release carbon dioxide by photosynthesis; the new leaf takes in this gas and uses it in respiration.
Microorganisms release dissolved glucose by digestion; the plant roots take in this sugar and transport it into leaves.
Microorganisms release dissolved mineral ions by decay; the plant roots take in these ions and convert them into glucose.
40 exam-style questions on AQA GCSE Biology 7.2 Organisation of an ecosystem, covering 7.2.1 Levels of organisation, 7.2.2 How materials are cycled, 7.2.3 Decomposition, and 7.2.4 Impact of environmental change (HT only). Each one has a worked solution and a mark scheme showing where the marks go.