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Solution


Q.

The primary producers of the deep-sea hydrothermal vent ecosystem are                      [2016]
1 green algae  
2 chemosynthetic bacteria  
3 blue-green algae   
4 coral reefs  

Ans.

(2)

Hydrothermal vents are cracks in the ocean floor that emit jets of hot water loaded with minerals and chemosynthetic bacteria. These bacteria are autotrophs that oxidize hydrogen sulphide in vent water to obtain energy, which is used to produce organic material. These chemosynthetic bacteria are the primary producers and form the base of vent food webs. All vent animals ultimately depend on bacteria for food.