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প্রতি বছর লবণাম্বুজ (ম্যানগ্রোভ) উদ্ভিদ থেকে প্রতি একরে বহু টন পাতা ঝরে থাকে; ছত্রাক এবং ব্যাকটেরিয়া এই পচনশীল পাতাগুলি ভেঙে এগুলি গ্রাস করে, তারপর তাদের ক্ষুদ্র কৃমি এবং ক্রাস্টেসিয়ান (কঠিন আবরণযুক্ত জলজ সন্ধিপদী প্রাণী) গ্রাস করে, যাদের পর্যায়ক্রমে ছোট মাছ ভক্ষণ করে, তারপর ছোট মাছদের, বড় মাছ এবং পাখি এবং কুমির ভক্ষণ করে। 

নিম্নলিখিতগুলির মধ্যে কোনটি উপরের বিবৃতিটির সাপেক্ষে সবচেয়ে যুক্তিসঙ্গত উপসংহার/সিদ্ধান্ত ?

This question was previously asked in
UPSC Civil Services Exam (Prelims) Official Paper-II 2015
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  1. উপকূলীয় অঞ্চলে লবণাম্বুজ  (ম্যানগ্রোভ) উদ্ভিদ ছাড়া খাদ্য-শৃঙ্খল থাকতে পারে না
  2. ​লবণাম্বুজ  (ম্যানগ্রোভ) উদ্ভিদ হল সমস্ত সামুদ্রিক বাস্তুতন্ত্রের একটি প্রয়োজনীয় উপাদান
  3. কিছু উপকূলীয় খাদ্য-শৃঙ্খলে লবণাম্বুজ  (ম্যানগ্রোভ) উদ্ভিদের গুরুত্বপূর্ণ ভূমিকা রয়েছে 
  4. ​সামুদ্রিক উদ্ভিদ এবং প্রাণীজগতের গঠন মূলত লবণাম্বুজ উদ্ভিদ দ্বারা নির্ধারিত হয়

Answer (Detailed Solution Below)

Option 3 : কিছু উপকূলীয় খাদ্য-শৃঙ্খলে লবণাম্বুজ  (ম্যানগ্রোভ) উদ্ভিদের গুরুত্বপূর্ণ ভূমিকা রয়েছে 
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Detailed Solution

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প্রশ্নানুসারে: 
লবণাম্বুজ  (ম্যানগ্রোভ) উদ্ভিদ → ছত্রাক/ব্যাকটেরিয়া → কৃমি/ক্রাস্টেসিয়ান → ছোট মাছ → বড় মাছ →  কুমির
এর অর্থ হল এই যে, ​লবণাম্বুজ (ম্যানগ্রোভ) উদ্ভিদ হল কিছু উপকূলীয় খাদ্য শৃঙ্খলের একটি অপরিহার্য অঙ্গ কারণ এটি সর্বত্র পাওয়া যায় না। ​লবণাম্বুজ উদ্ভিদগুলি প্রধানত 25° উত্তর (N) এবং 25° দক্ষিণ (S) অক্ষাংশের মধ্যে পাওয়া যায়। যদিও, সামুদ্রিক জীবনে এমন কোনো জিনিস নেই যেহেতু পৃথিবীর 70% জলে ঢাকা।

অতএব, উপকূলীয় কিছু খাদ্য-শৃঙ্খলে লবণাম্বুজ উদ্ভিদ গুরুত্বপূর্ণ ভূমিকা পালন করে।

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