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Question
Give reason for the following.
Farmers prefer to grow beans and peas in nitrogen deficient soils.
Solution
Beans and peas are leguminous plants as they have Rhizobium, a bacteria in their root nodules. This bacteria can fix atmospheric nitrogen to enrich the soil with nitrogen and increase its fertility.
Farmers grow leguminous plants in between the major crops, a practice called crop rotation to restore the used nutrients of the soil.
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Define chemoautotrophs.
Long Answer Question:
Explain biological nitrogen fixation with example.
Write the role of nitrogenase enzyme in nitrogen fixation?
How do vaccines work?
Match Column - I with Column - II.
| Column - I | Column - II | ||
| (a) | Nitrococcus | (i) | Denitrification |
| (b) | Rhizobium | (ii) | Conversion of ammonia to nitrite |
| (c) | Thiobacillus | (iii) | Conversion of nitrite to nitrate |
| (d) | Nitrobacter | (iv) | Conversion of atmospheric nitrogen to ammonia |
Choose the correct answer from the options given below.
In the Nitrification process, the ammonium compounds are oxidised to soluble ______.
The atmosphere is a rich source of ______.
The blue-green algae that take part in nitrogen fixation are also called ______.
How are organisms like Pseudomonas and Thiobacillus of great significance in nitrogen cycle?
Match the following:
| Column A | Column B (Organisms) | ||
| (1) | Symbiotic nitrogen fixation | (a) | Nitrobacter |
| (2) | Denitrification | (b) | Cyanobacteria |
| (3) | Free living nitrogen fixers | (c) | Rhizobium |
| (4) | Nitrification | (d) | Paracoccus |
