Diversity of organisms — A/L Biology

How do I practise Diversity of organisms?

1 question with a worked solution

1. Which substance is the main component of the cell walls of fungi?
   1. A) Lignin
   2. B) Cellulose
   3. C) Peptidoglycan
   4. D) Chitin
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   Correct answer: D) Chitin

   Fungal cell walls are made mainly of chitin, a nitrogen-containing polysaccharide. Plant cell walls are made mainly of cellulose and bacterial cell walls of peptidoglycan, while lignin strengthens the walls of some plant tissues such as xylem. None of these three is the main wall material of fungi.

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   Step 1: Name the main cell wall material of each group: plants = cellulose; bacteria = peptidoglycan; fungi = chitin. Step 2: Lignin is added to the walls of some plant tissues (for example xylem); it is not a fungal wall material. Answer: Chitin.
   Modelled on: the A/L Biology examination pattern

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Where does Diversity of organisms fit in the syllabus?

Grade 12 · Term 1