23
Which are the correct statements about the distinct zonation and stratification of lakes and large ponds?
(A) . A deep water profundal zone containing autotrophs and heterotrophs
(8). Littoral and limnetic zones have ratio of P/R 1
(C) . Nektons are free-swimming organisms such as fish
(D) . Neustons are organisms at water's surface film, such as water striders.
Choose the correct answer from the options given below:
EXPLANATION
Ecological Succession, Population/Community D
- Statement (C) is Correct: Nektons are free-swimming aquatic organisms (such as fishes, amphibians, and larger swimming insects) capable of navigating independently of water currents.
- Statement (D) is Correct: Neustons are specialized organisms inhabiting the air-water interface / surface film tension (e.g., Gerris water striders).
- Why (A) and (B) are Incorrect: The profundal zone (A) is deep, aphotic, and devoid of photosynthetic autotrophs. In littoral and limnetic zones (B), gross primary production exceeds community respiration ($P/R \gt 1$), whereas in the profundal zone respiration exceeds production ($P/R \lt 1$).
Explanation not matching this question?
क्या व्याख्या इस प्रश्न से मेल नहीं खा रही?
Report
Want to practice this paper in exam conditions?
क्या आप परीक्षा जैसे माहौल में अभ्यास करना चाहते हैं?
Test yourself in 5-question batch format with timer and hidden answers.
5-प्रश्नों के बैच फॉर्मैट, टाइमर और छिपे उत्तरों के साथ खुद को परखें।
Start Practice Mode →
प्रैक्टिस टेस्ट मोड शुरू करें →