Bioaccumulation
Bioaccumulation is a Environment concept from the MPSC syllabus, tested in 2 past MPSC questions (2013, 2014). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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अन्नसाखळीमध्ये प्रत्येक ऊर्जास्तरावर विषारी पदार्थाच्या प्रमाणात सलग्न होणाऱ्या वाढीस _________ म्हणतात. The continuous increase in concentration of a toxicant at successive trophic levels in food chain is :
Biomagnification refers to the progressive increase in the concentration of toxic substances (like DDT or mercury) at higher trophic levels of a food chain.
डायक्लोरोडिफेनिलट्रायकलोरो इथेन (डीडीटी) सर्वप्रथम क्लोरेनिडेटेड ऑरगॅनिक कीटकनाशक असून परिणामकारक कीड नष्ट करणाऱ्या त्याच्या गुणांकास्ता पॉल मुलर यांना मेडीसीन व फिजिऑलॉजीचे 1948 चे नोबेल पारितोषिक प्रदान करण्यात आले. वरील कोणती विधाने खरी आहेत ? Dichlorodiphenyl Trichloro Ethane (DDT) is the first chlorinated organic insecticide for the discovery of its effectiveness as an insecticide Paul Muller was awarded Nobel Prize in Medicine and physiology in 1948. Which of the above statements are correct ?
(a)डीडीटी मलेरिया पसरविणाऱ्या मच्छरांविरुद्ध परिणाम कारक आहे. / DDT is effective against mosquitos that spread malaria.
(b)डीडीटी टायफस वाहतूक करणाऱ्या उवांविरुद्ध (lice) परिणामकारक आहे. / DDT is effective against lice that carry typhus.
(c)डीडीटी पाण्यातील माशांकरिता अत्यंत विषारी आहे. / DDT has high toxicity towards fish.
(d)प्राणीजन डीडीटीचे सहज चयापचय प्रक्रिया (पृथक्करण) करू शकत नाहीत. / DDT is not metabolised easily by animals.
DDT is a historic synthetic insecticide credited with stopping vector-borne diseases like malaria and typhus. It affects aquatic life negatively and persists in animal fatty tissues due to poor metabolism.