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Edexcel IAL Biology 6.16 Microbial decomposition and carbon recycling

Identify the substrate and microbial process, trace soluble products into respiration or growth and use the graph trend to explain carbon transfer or oxygen demand.

Syllabus
First assessment 2019
Course
Biology YBI11
Level
A2

Exam points

  • Explain extracellular digestion of dead matter and uptake of soluble products.
  • Link aerobic microbial respiration to oxygen depletion and carbon dioxide release.
  • Interpret microbial biomass changes through nutrients, toxins or competition.

6.16—Microorganisms in decomposition and carbon recycling question 1

[Maximum number: 6]

Quince are fruit that grow on trees.
When a quince falls from the tree, two processes take place: browning and decomposition.

A quince fruit is made up of cells and contains a lot of juice.

The table shows the composition of carbohydrates in the juice of one species of quince.

Table for Question 6.16—Microorganisms in decomposition and carbon recycling question 1 — Edexcel A-Level Biology A2

*(iii) Explain the role of decomposition in returning the carbon present in the carbohydrates in the quince fruit back into the atmosphere.

Use the information given in part (b) to support your answer.

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