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प्रश्न
Suggest a suitable word for the following statement.
Agent which spreads pathogens from one place to another.
उत्तर
Carrier/Vector are the modes of transmission of a disease.
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संबंधित प्रश्न
Blue green algae fix _________ directly from air to enhance fertility of soil.
Long Answer Question:
Explain biological nitrogen fixation with example.
How do human activities affect nitrogen cycle?
Which free living microorganism helps in nitrogen fixation?
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.
Nitrogen is an essential component of protein, DNA, and chlorophyll.
Draw a neat flow chart of the Nitrogen cycle. Briefly explain the various processes involved in the nitrogen cycle.
Name the cell which is responsible for nitrogen fixation in cyanobacteria.
What is nitrification?
Match column I with Column II.
| Column I | Column II |
| A Acidic | (i) Phenylalanine (Phe) |
| B Neutral | (ii) Cysteine (Cys) |
| C Aromatic | (iii) Valine (Val) |
| D S(Sulphur) containing | (iv) Asparagine (Asn) |
Select the correct answer from the options given below.
