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Q. Which of the following organisms possess chitin in their cell walls?
  1. Mushrooms
  2. Yeasts
  3. Diatoms
  4. Blue-Green Algae
Select the correct option from the codes below:
Answer: Only 1 and 2
Notes: Mushrooms and yeasts are fungi and have chitin in their cell walls. Diatoms have silica-based cell walls, while blue-green algae (cyanobacteria) are prokaryotes with peptidoglycan cell walls. Chitin is characteristic of fungal cell walls, distinguishing them from diatoms and cyanobacteria, which lack chitin.
Question Source: 📚This question has been sourced from GKToday's Target UPSC Prelims for 2026, 2027 & 2028 App Exclusive Course in GKToday Android Application which provides more than 12K Topicwise UPSC Prelims General Studies questions with explanations framed on UPSC pattern. Download the app here.
📌 Question Number: 99 in 102: Biological Classification in the above course in App.