During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by?
1. Leghaemoglobin
2. Xanthophylls
3. Carotene
4. Cytochrome
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPrefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot
NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyFor its action, nitrogenase requires:
1. Light
2. Mn2+
3. Super oxygen radicals
4. High input of energy
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyRead the following four statements (I-IV):
I. | Both, photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane |
II. | In dicot stems, a new cambium originates from cells of pericycle at the time of secondary growth |
III. | Stamens in flowers of Gloriosa and Petunia are polyandrous |
IV. | Symbiotic nitrogen-fixers occur in a free-living state and also in soil |
How many of the above statements are right?
1. Three
2. Four
3. One
4. Two
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe function of leghemoglobin in the root nodules of legumes is:
1. oxygen removal
2. nodule differentiation
3. expression of nif gene
4. inhibition of nitrogenase activity
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyLeguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statements is not correct during this process of nitrogen fixation:
1. | Nodules act as sites for nitrogen fixation |
2. | The enzyme nitrogenase catalyses the conversion of atmospheric N2 to NH3 |
3. | Nitrogenase is insensitive to oxygen |
4. | Leghaemoglobin scavenges oxygen and is pinkish in colour |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology