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Question
Nitrogen is present in the atmosphere in huge amounts but higher plants fail to utilize it. Why?
Answer in Brief
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Solution
- Plants absorb minerals from the soil along with water with the help of Roots. Minerals are absorbed as salts.
- Nitrogen is present in large quantities in the atmosphere in a gaseous form, the gaseous nitrogen must be fixed in the form of Nitrate salts in the soil to facilitate absorption by plant roots.
- Nitrogen fixation can occur 2 ways by
- Non - Biological means (Industrial process or by lighting)
- Biological means (Bacteria/Cyanobacteria Fungi)
- Therefore higher plants con not utilize the atmospheric Nitrogen.
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RELATED QUESTIONS
Identify the correct statement.
- Sulphur is essential for amino acids Cystine and Methionine.
- Low level of N, K, S and Mo affect cell division.
- Non-leguminous plant Alnus which contain bacterium Frankia.
- Denitrification carried out by nitrosomonas and nitrobac.
Match the minerals given in Column - I with their sources given in Column - II from where terrestrial plants derive them.
| Column - I | Column - II | ||
| i. | Hydrogen | a. | Soil |
| ii. | Oxygen | b. | Water |
| iii. | Carbon | c. | Air and water |
| iv. | Nitrogen | d. | Atmosphere |
