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The mangroves can shed tons of leaves per acre every year; fungi and bacteria break down this leaf litter and consume it, they then are consumed by tiny worms and crustaceans, which in turn feed small fish, which feed larger fish and birds and crocodiles.

Which among the following is the most logical inference of the above statement?

This question was previously asked in
UPSC Civil Services Exam (Prelims) Official Paper-II 2015
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  1. Coastal areas cannot have food chains without magroves.
  2. Mangroves are an essential component of all marine ecosystems.
  3. Mangroves have a crucial role in some of the coastal food chains.
  4. The composition of marine flora and fauna is largely determined by mangroves.

Answer (Detailed Solution Below)

Option 3 : Mangroves have a crucial role in some of the coastal food chains.
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Detailed Solution

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According to the question: 
Mangroves → fungi/bacteria → worms/crustacenas → small fish →  large fish →  crocodile
It means that mangroves are an essential part of some of the coastal food chains as it is not found everywhere. Mangroves are found mainly between latitudes 25 °N and 25 °S. Though, there is no such thing with marine life as 70% of the earth surface is covered with water.

Hence, mangroves have a crucial role in some of the coastal food chains.

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