What environmental issue involves the excessive use of fertilizers and run-off chemimls into bodies of water. causing oxygen depletion and harm to aquatic ecosystems?

ক Acid rani
খ Eutrophication
গ Desertification
ঘ Deforestation

সঠিক উত্তর: Eutrophication

ইউট্রোফিকেশন বলতে স্বাদু জলের জলাশয়ে সার বা পয়ঃনিষ্কাশনের মাধ্যমে কৃত্রিম বা অকৃত্রিম পদার্থ যেমন নাইট্রেট এবং ফসফেট যোগ করাকে বোঝায়।
Bissoy MCQ

Related Questions

Which of the following organisms fix nitrogen in aquatic ecosystems?
ক Fungi
খ Chemoautotrophs
গ Cyanobacteria
ঘ Phytoplankton
’Harm watch, harm catch' প্রবাদটির অর্থ কী?
ক অতি লোভে তাঁতি নষ্ট।
খ ভয় কররে ভয়, আপনি এসে পড়ে
গ অবলার মুখেই বল।
ঘ অনাভাস্যের ফোঁটা চড়চড়।
Under the depletion allowance method in computing depreciation, the depletion charge is equal to either ______ whichever is smaller.
ক Fixed percentage of gross income or the net taxable income
খ Fixed percentage of gross income or 50% of the net taxable income
গ 50% of the fixed percentage of gross income or 50% of the net taxable income
ঘ 50% of the fixed percentage of gross income or the net taxable income
The depletion allowance method of computing depletion is commonly known as ______.
ক Unit method
খ Percentage method
গ Factor method
ঘ Sinking fund method
The word 'irrevocable' in the sentence , 'Lead poisoning in the city is causing irrevocable harm to our children , means
ক irrelevant
খ irresistible
গ irreparable
ঘ irreplaceable
Malicious hackers who act with the intention of causing harm are __________.
ক White hats
খ Black hats
গ Grey hats
ঘ Brown hats
The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is
ক 1 ppm
খ 4 ppm
গ 10 ppm
ঘ 40 ppm
In order to protect the aquatic creatures, the dissolved oxygen content in fresh water stream should never be less than __________ PPm.
ক 0.5
খ 1
গ 5
ঘ 20
For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.
ক 10000
খ 5
গ 500
ঘ 1000
CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozones.
ক 102
খ 105
গ 109
ঘ 1015

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