Question
How do vaccines work?
✓
Answer
Vaccines contain dead or weakened microbial strains of a particular disease. When a vaccine is introduced into a heathy body. It produces specific cells against the pathogen. These cells, are called antibodies and they becomes active when the pathogen attack our body. The body fights and kills them by producing 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 forms of drops) or injected in the body.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Describe an activity to show that thermoplastic is a poor conductor of electricity.
Manu was heating oil to fry potato chips. The cooking oil all of a sudden caught fire; he poured water to extinguish the fire. Do you think this action was suitable. If yes, why? If not, why not? In such a condition what should Manu have done?
Fill in the blanks using the words given in the box.
$a.$ A chemical process in which a substance reacts with oxygen to give off heat is called $............$
$b.$ Wood, paper, $\text{CNG}$ are $............$ substances.
$c.$ The lowest temperature at which a substance catches fire is called its $............$ temperature.
$d.$ Ignition temperature of $............$ is lower than that of wood.
$e.$ The substances which have very low $............$ temperature and can easily catch fire with a flame are called $............$ substances.
$f.$ The amount of heat energy produced on complete combustion of $1\ kg$ of a fuel is called its $............$
→$a.$ A chemical process in which a substance reacts with oxygen to give off heat is called $............$
$b.$ Wood, paper, $\text{CNG}$ are $............$ substances.
$c.$ The lowest temperature at which a substance catches fire is called its $............$ temperature.
$d.$ Ignition temperature of $............$ is lower than that of wood.
$e.$ The substances which have very low $............$ temperature and can easily catch fire with a flame are called $............$ substances.
$f.$ The amount of heat energy produced on complete combustion of $1\ kg$ of a fuel is called its $............$
What type of combustion is represented by:
$a.$ Burning of white phosphorus in air at room temperature?
$b.$ Burning of $\text{LPG}$ in a gas stove?
$c.$ Ignition of a cracker?
$d.$ Burning of coal dust in a coal mine?
→$a.$ Burning of white phosphorus in air at room temperature?
$b.$ Burning of $\text{LPG}$ in a gas stove?
$c.$ Ignition of a cracker?
$d.$ Burning of coal dust in a coal mine?
Who is responsible for the sex of the unborn child: father or mother? Why?
What makes the middle zone of a candle flame luminous (or light-giving)?
Name the three layers of earth. Draw a labelled diagram to show the structure of earth.
Explain why:
$i.$ A pencil will write on paper but not on glass.
$ii.$ Climbing a greasy pole is very difficult.
→$i.$ A pencil will write on paper but not on glass.
$ii.$ Climbing a greasy pole is very difficult.
The bulb does not glow in the setup shown in Fig. $14.10$. List the possible reasons. Explain your answer. 
→Adam’s apple.