Question:
Heterocysts do not contain __________.
Heterocysts do not contain __________.
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One of these four is a brown algal storage product, not a cyanobacterial one.
Updated On: Jul 4, 2026
- laminarin
- glycolipids
- polysaccharides
- polar granule
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The Correct Option is A
Solution and Explanation
Step 1: Heterocysts are the thick-walled, nitrogen-fixing cells found in certain filamentous cyanobacteria.
Step 2: Their thick envelope contains an outer glycolipid layer and an inner polysaccharide layer, and they show polar granules (cyanophycin) near the pores connecting them to neighboring vegetative cells.
Step 3: Laminarin is a storage carbohydrate found in brown algae (Phaeophyceae), a completely different group, and has no role in cyanobacterial heterocysts. So option (A) is the one heterocysts do not contain.
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