Nitrogen fixation with MCQ Biology by Harcharan Sir

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Bioshooter - Bikaner 9461245636 • #csirnet #lifescience • Option 3 is correct: The rhizobial cells cannot fix nitrogen when exposed to atmospheric air. • 3. Option 3: The rhizobial cells cannot fix nitrogen when exposed to atmospheric air. • o Explanation: Nitrogen fixation by Rhizobium requires a low-oxygen environment because the nitrogenase enzyme, responsible for converting atmospheric nitrogen to ammonia, is highly sensitive to oxygen. This low-oxygen environment is typically maintained within the plant root nodules by leghaemoglobin. • o Supporting Research: Studies on nitrogenase activity (e.g., Dixon Kahn, Annual Review of Microbiology, 2004) confirm that high oxygen levels inhibit nitrogenase, preventing nitrogen fixation outside of the controlled, low-oxygen environment provided in the root nodules. • Here are some key points to remember: • • Rhizobium bacteria are obligate anaerobes: This means they require an oxygen-free environment to carry out nitrogen fixation. • • The nitrogenase enzyme: This enzyme is responsible for converting atmospheric nitrogen (N2) into ammonia (NH3), a form usable by plants. However, nitrogenase is highly sensitive to oxygen. • • Leghemoglobin: This red pigment is produced within root nodules to bind excess oxygen, creating a microaerobic environment favorable for nitrogen fixation. • RAS SI REET GK Class • rajasthan current affairs • rajasthan History • rajasthan art and culture • rajasthan geography • rajasthan economics • GENERAL SCIENCE #NEET #AIIMS #csir net #lifescience #currentaffairs #ras #rasbikaner #rajasthangk #icse #REET #reetbikaner #ssc #sscbikaner #ssccgl #sscgd #patwari #railway #rssb #rssbbikaner #rssb_jen #subinspector #policeconstable #policebharti #delhipolice #delhipoliceconstable #librarian #banking OTHER competitive EXAM / 11 12 CLASS CBSE NCERT BIOLOGY BIKANER . • Rajasthan Police Constable Recruitment • librarian vacancy 2024 • राजस्थान पुलिस विभाग द्वारा पुलिस कांस्टेबल के पदों पर भर्ती • राजस्थान पशु परिचारक भर्ती : Rajasthan Animal Attendant • राजस्थान कर्मचारी चयन बोर्ड (RSMSSB) - पशु परिचारक • Rajasthan Staff Selection Board (RSMSSB) • Rajasthan Forest Guard Vacancy • Rajasthan police Si Bharti • Rajasthan Hostel Superintendent Vacancy • Rajasthan Hostel Warden Vacancy • Rajasthan Patwari Vacancy • SSC Group C Vacancy • कर्मचारी चयन आयोग (एसएससी) • B.Sc. , M.Sc. PhD ENTRANCE EXAM • Rajasthan Police Recruitment • Rajasthan Asha Sahyogini Recruitment • राजस्थान आशा सहयोगिनी भर्ती • Rajasthan Agriculture Supervisor Vacancy • #bstc • Rajasthan Junior Accountant Vacancy • राजस्थान कनिष्ठ लेखाकार भर्ती • Rajasthan Sanganak Vacancy • राजस्थान संगणक भर्ती • आरएसएमएसएसबी संगणक सीधी भर्ती • Rajasthan Police Constable Bharti • राजस्थान पुलिस कांस्टेबल भर्ती • Rajasthan GDS Recruitment • राजस्थान ग्रामीण डाक सेवक भर्ती • Central Teacher Eligibility Test -CTET • Rajasthan High Court JPA • राजस्थान हाई कोर्ट जूनियर पर्सनल असिस्टेंट भर्ती

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