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प्रश्न
Give the biochemical events occurring in the root nodule of a pulse plant. What is the end product? What is its fate?
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उत्तर
Nodule Formation:
- Rhizobium bacteria contact a susceptible root hair and begin to divide near it.
- After successful infection, the root hair curls.
- The infected thread of the root carries the bacteria to the inner cortex. The bacteria get modified into rod-shaped bacteroids. This causes the inner cortical and pericycle cells to divide.
- Division and growth of cortical and pericycle cells result in nodule formation.
- A mature nodule is complete with vascular tissues, which are continuous with the vascular tissues of the root.
Importance of 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 an anaerobic condition to maintain its existence.
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संबंधित प्रश्न
What are the steps involved in formation of a root nodule?
Plants absorb nitrogen as ______.
In Glycine max, the product of biological nitrogen fixation is transported from the root nodules to other parts as ______.
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.
Nitrogen fixation is shown by prokaryotes and not by eukaryotes. Comment.
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?
Name one non-symbiotic nitrogen fixing prokaryote.
Rice fields produce an important greenhouse gas. Name it.
Complete the equation for reductive amination
\[\ce{->[?] + NH^{+}4 + NADPH ->[][?] glutamate + NADP + H2O}\]
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
