পরিবেশ, তার সম্পদ এবং তাদের সংরক্ষণ (প্রশ্ন-উত্তর পর্ব-০১)
1. পরিবেশ কাকে বলে?
» আমাদের চারপাশের যে জগৎ —আলো, বাতাস, মাটি, জল, গাছপালা, পশু-পাখি, কীটপতঙ্গ ইত্যাদির সমাহার কে পরিবেশ বলে।
2. সম্পদ কাকে বলে?
» কোন উপাদান বা উপকরণ যখন তার উপযোগীতাকে কার্যকর করে মানুষের অভাব মোচন করে বা চাহিদা পূরণ করে, তখন তাকে সম্পদ বলে।
3. নাইট্রোজেনের প্রধান উৎস কি?
» বায়ুমন্ডলের নাইট্রোজেন ও মাটির নাইট্রেট লবণ।
4. বাতাসে নাইট্রোজেনর পরিমাণ কত?
» 77.17%
5. বাতাসে অক্সিজেনের পরিমাণ কত?
» 20.60%
6. নাইট্রোজেন সংবন্ধনকারী ব্যাকটেরিয়ার নাম কী?
» অ্যাজোটোব্যাকটর, ক্লসট্রিডিয়াম।
7. নাইট্রোজেন সংবন্ধনকারী শৈবালের নাম লেখো।
» অ্যানাবিনা, নস্টক।
8. নাইট্রোজেন সংবন্ধনকারী মিথোজীবী ব্যাকটেরিয়ার নাম কী?
» রাইজোবিয়াম।
9. নাইট্রোজেন চক্র কাকে বলে?
» যে চক্রাকার পদ্ধতিতে বায়ুমন্ডলের নাইট্রোজেন প্রাকৃতিক উপায়ে ও জীবাণু দ্বারা আবদ্ধ হয়ে মাটিতে মেশে ও সেখান থেকে জীবদেহে প্রবেশ করে এবং জীবদেহ ও মাটি থেকে পুনরায় বায়ুমন্ডলে আবর্তিত হয়, তাকে নাইট্রোজেন চক্র বলে।
10. পরিবেশের নাইট্রোজেন মাটিতে কি রূপে সঞ্চিত হয়?
» নাইট্রেট (NO3) রূপে সঞ্চিত হয়।
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