Question

In legume nodules, nitrogen fixation requires low O_2 despite active respiration. Which mechanism maintains this balance?

Asked in UP PGT (Biology) · 2026
Mineral Nutrition · Biology
Exam PYQ4 Options
BiologyPlant PhysiologyMineral NutritionNitrogen FixationUP PGT (Biology)2026
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Photosynthesis uses light energy to convert carbon dioxide and water into carbohydrates.

Correct AnswerCorrect option for this question
Option B — Leghemoglobin buffers O_2 , maintaining low levels for itrogenase while allowing high respiration

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Questions Asked from Respiration in Plants: Glycolysis, Krebs & ATP Yield in Previous Exams

See how often Respiration in Plants: Glycolysis, Krebs & ATP Yield has appeared in previous-year questions across major government exams.

High Exam Frequency
11UPSC Questions Asked in These Years:2011, 2012, 2014, 2015, 2016, 2019, 2020, 2021, 2022, 2023, 2024
11SSC Questions Asked in These Years:2014, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026
7Railways Questions Asked in These Years:2016, 2018, 2021, 2022, 2024, 2025, 2026
15State PSC Questions Asked in These Years:2004, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025
Respiration in Plants: Glycolysis, Krebs & ATP Yield has appeared in 44 previous-year exam questions, most frequently in State PSC, UPSC and SSC.
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