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NEET UG BIOLOGY MCQ: MINERAL NUTRITION
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Which of the following statements about the nitrogen cycle are false?
I) Rhizobium and Frankia cause nitrogen fixation in their independent free-living stage.
II) Azotobacter and Anabaena are anaerobic, symbiotic, free-living, nitrogen fixers.
III) Rhodospirillum is an aerobic, nitrogen fixing microbe found in the root nodules of legumes.
IV) Nitrobacter oxidizes nitrites to nitrates.
I) Rhizobium and Frankia cause nitrogen fixation in their independent free-living stage.
II) Azotobacter and Anabaena are anaerobic, symbiotic, free-living, nitrogen fixers.
III) Rhodospirillum is an aerobic, nitrogen fixing microbe found in the root nodules of legumes.
IV) Nitrobacter oxidizes nitrites to nitrates.
View answer and explanation
Correct option: C
I, II and III
Option C is correct because statements I, II, and III are false. Rhizobium and Frankia are symbiotic nitrogen fixers, Azotobacter and Anabaena are not both anaerobic and symbiotic, and Rhodospirillum is not found in root nodules.
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I Nitrosomonas – Nitrite to nitrate
II Thiobacillus - Denitrification
III Nostoc - Free-living nitrogen-fixer
IV Azotobacter - Anaerobic nitrogen-fixer Deficiency of which to the following can cause yellowing of intravenous regions of leaves? Which among the following are used as media for hydroponics? Elements mainly involved in cell membrane synthesis, in normal functioning of the cell membrane are The major characteristics of colloids is/are
I Nitrosomonas – Nitrite to nitrate
II Thiobacillus - Denitrification
III Nostoc - Free-living nitrogen-fixer
IV Azotobacter - Anaerobic nitrogen-fixer Deficiency of which to the following can cause yellowing of intravenous regions of leaves? Which among the following are used as media for hydroponics? Elements mainly involved in cell membrane synthesis, in normal functioning of the cell membrane are The major characteristics of colloids is/are