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Mineral Nutrition — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYMineral Nutrition3 Marks
Question
A section of root nodule of chick-pea plant appears pink,
  1. Name the pigment, responsible for pink colour.
  2. What is the role of this pigment in the nodule formation?
  3. Explain the process of biological nitrogen-fixation in the root nodules in short.
✓

Answer

On observing the section of root nodule:
  1. The pink colour of root nodule is due to the presence of pigment leghaemoglobin.
  2. The pigment protects enzyme nitrogenase from oxygen as this enzyme is highly sensitive to $\mathrm{O}_2$ and functions only in anaerobic conditions (absence of oxygen).
  3. During the process of biological nitrogen-fixation, the molecular nitrogen present in the air is converted into inorganic nitrogenous compound (such as nitrite, nitrate and ammonia) through bacteria, cyanobacteria (blue-green algae), etc.
The organism reduces nitrogen by the help of an enzyme nitrogenase (present in only certain prokaryotes).

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