Q.35 Which of the following is/are example(s) of a lotic ecosystem?
(A) Lake
(B) Pond
(C) River
(D) Stream
CORRECT ANSWER: (C) River and (D) Stream
Quick Answer Explanation:
Lotic Ecosystem = Flowing water ecosystems with continuous directional water movement
Lentic Ecosystem = Still water ecosystems with stagnant or minimal water movement
Option Analysis:
| Option | Answer | Reason |
|---|---|---|
| (A) Lake | ❌ WRONG | Lakes are lentic (still water), not flowing |
| (B) Pond | ❌ WRONG | Ponds are lentic (still/stagnant water), not flowing |
| (C) River | ✅ CORRECT | Rivers have continuous directional flow – perfect example of lotic |
| (D) Stream | ✅ CORRECT | Streams have continuous flowing water – definitive lotic ecosystem |
Key Distinguishing Features:
Lotic Ecosystems (Rivers & Streams):
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Continuous unidirectional water flow
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High dissolved oxygen (due to turbulence)
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Dynamic habitat with rapids and pools
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Organisms adapted to flowing water (streamlined fish, attached invertebrates)
Lentic Ecosystems (Lakes & Ponds):
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Still or stagnant water
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Variable dissolved oxygen (high at surface, low at depth)
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Thermal stratification into distinct zones
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Organisms adapted to still water (plankton, rooted plants)
✅ Target Keywords: lotic ecosystem, lentic ecosystem, river ecosystem, stream ecosystem, flowing water, freshwater ecosystems
The comprehensive article has been created with detailed explanations, comparison tables, common mistakes to avoid, and ecological importance of lotic ecosystems—perfect for CSIR NET exam preparation!
