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Organic substances decay into simpler substances - AQA - GCSE Biology - Question 4 - 2023 - Paper 2
Question 4
Organic substances decay into simpler substances. The leaves fall off many trees in autumn. The dead leaves contain carbon compounds and nitrogen compounds. Descr... show full transcript
Worked Solution & Example Answer:Organic substances decay into simpler substances - AQA - GCSE Biology - Question 4 - 2023 - Paper 2
Step 1
how the leaves are broken down
Answer
When leaves fall and decompose, microorganisms such as bacteria and fungi play a crucial role in breaking down the organic matter. They digest the complex carbon compounds in the leaves, converting them into simpler substances through processes such as respiration. During decomposition, carbon dioxide is released back into the atmosphere as a byproduct.
Step 2
how substances are taken in and used by the trees
Answer
As the leaves decompose, nitrogenous compounds are formed, including nitrates, which are absorbed by the roots of living trees. These nitrates serve as essential nutrients that trees utilize to synthesize proteins and other vital compounds necessary for their growth and survival. Additionally, carbon dioxide released during decomposition can be reabsorbed by trees during photosynthesis, integrating these elements back into their biological processes.