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प्रश्न
How do vaccines work?
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उत्तर
Vaccines contain dead or weakened microbial strains of a particular disease. When a vaccine is introduced into a healthy body. It produces specific cells against the pathogen.
These cells are called antibodies and they become active when the pathogen attacks our body. The body fights and kills them by producing a specific set of reactions.
These antibodies remain in the body for life long and protect against the microbe when microbe enters the body again.
Vaccines can be given either orally (in the form of drops) or injected into the body.
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संबंधित प्रश्न
Match the following.
| Microorganism | Role Played |
| Nitrosomonas | Nitrogen fixation |
| Azotobacter | Ammonification |
| Pseudomonas species | Nitrification |
| Putrefying bacteria | Denitrification |
Which free living microorganism helps in nitrogen fixation?
The process of nitrogen-fixation by bacteria does not take place in the presence of
Suggest a suitable word for the following statement.
Agent which spreads pathogens from one place to another
Give reason for the following.
Farmers prefer to grow beans and peas in nitrogen deficient soils.
The atmosphere is a rich source of ______.
Assertion (A): Plants and animals can utilize atmospheric nitrogen.
Reason (R): The atmosphere is a rich source of nitrogen.
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.
Consider the following statements. Which of the statements given below is incorect?
