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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
Draw diagram of Nitrogen cycle.
Describe nitrogen cycle.
Explain the following cycle in your own words with a suitable diagram.
Nitrogen cycle.
Nitrogen is a greenhouse gas.
When we breathe in air, nitrogen also goes inside along with oxygen. What is the fate of this nitrogen?
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.
The bacteria present in the root nodules of leguminous plants is ______.
The atmosphere is a rich source of ______.
Nitrogen is an essential component of protein, DNA, and chlorophyll.
Name the cell which is responsible for nitrogen fixation in cyanobacteria.
