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प्रश्न
Name the most crucial enzyme found in root nodules for N2 fixation? Does it require a special pink coloured pigment for its functioning? Elaborate.
उत्तर
Nitrogenase is the essential enzyme found in root nodules for nitrogen fixation. It requires a pink-coloured pigment called leghaemoglobin. Leghaemoglobin works as an oxygen scavenger and thus creates anaerobic conditions in the root nodule of a legume. Nitrogenase is highly sensitive to oxygen and needs anaerobic conditions to maintain its existence.
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संबंधित प्रश्न
What are the conditions necessary for fixation of atmospheric nitrogen by Rhizobium. What is their role in N2 -fixation?
In some plants, like soyabean, fixed nitrogen is exported into the transpiration stream as :
Reaction carried out by N2 fixing microbes include
- \[\ce{2NH3 + 3O2 -> 2NO^{-}2 + 2H^{+} + 2H2O (i)}\]
- \[\ce{2NO^{-}2 + O2 -> 2NO^{-}3 (ii)}\]
Which of the following statements about these equations is not true
With regard to the Biological Nitrogen Fixation by Rhizobium in association with soybean, which one of the following statement/ statements does not hold true.
Name a plant which lacks chlorophyll. How will it obtain nutrition?
A farmer adds Azotobacter culture to soil before sowing maize. Which mineral element is being replenished?
What is the function of leghaemoglobin in the root nodule of a legume?
Complete the equation for reductive amination
\[\ce{->[?] + NH^{+}4 + NADPH ->[][?] glutamate + NADP + H2O}\]
We find that Rhizobium forms nodules on the roots of leguminous plants. Also Frankia another microbe forms nitrogen fixing nodules on the roots of non-leguminous plant Alnus.
- Can we artificially induce the property of nitrogen fixation in a plant – leguminous or non-leguminous?
- What kind of relationship is observed between mycorrihiza and pine trees?
- Is it necessary for a microbe to be in close association with a plant to provide mineral nutrition? Explain with the help of one example.
Trace the events starting from the coming in contact of Rhizobium to a leguminous root till nodule formation. Add a note on importance of leg hemoglobin
