Question

D.A.V.PUBLIC
ENGLISH HOLIDAYS' HOMEWORK ASSIGNMENT
STD-VII
Q1: Read the given passage carefully and answer the questions which follow:
The human body often takes care of itself without the person who owns the body knows what is
happening. The body takes care of itself through its immune system. The immune system is in
charge of keeping the body safe from invading germs that try to attack it every day. The immune
system involves the different organs of the body and works together with the blood system.
The immune system defends the body against attacks by germs and bacteria. The system
includes the skin white blood cells, and the lymph system. The immune system works like a fort
protecting the body and will increase it defenses when it is necessary.
The skin is the first defense against germs entering the body and it covers like a guard against
harmful bacteria. Keeping the body clean is quite important since it is the first place the germs
attack. Doctors, nurses, and other health professionals take great care in washing their hands
because they know the germs can easily spread through contact with the skin.
The white blood cells are the watchers of the blood. There are three types of white blood cells
called lymphocytes, neutrophils, and macrophages. Each has its own roles. White blood cells
are made constantly since they live for a few weeks. Other types of white blood cells attack
germs and bacteria when they are detected in the body. A tiny drop of blood contains up to
25,000 white blood cells.
The lymphocytes are most vital because they attack two kinds of infections: viral and bacterial. T
cells and B cells are two types of lymphocytes. T cells find hidden germs or unhealthy cells and
destroy them. The B cells produce antibodies and are used for specific germs. It will attach itself
to the germ and then other white blood cells know it needs to be destroyed.
The lymphocytes are part of the lymph system. Lymph fluid travels to different parts of the body
where it will pick up bacteria and viruses. It carries them to lymph nodes, which are glands that
collect and destroy it before it travels to the rest of the body.
Some germs, though, actually help make the immune system stronger. The body remembers
the bad germs that attack it and then is ready for it if it comes back to cause problems again. It
is important for the body to be exposed to some germs because the immune system can then
fight off the gems when they come back. This is how a vaccine works. A weak virus is actually
injected into the body for the immune system to fight against
Allergies are the result of the immune system attacking too often. The system falsely believes
the food product or other item is a bacteria or virus so it begins to attack it, which causes
symptoms such as sneezing. Itching, runny nose, sore throat, hives, and stomach cramps.
Sometimes the immune system attacks healthy cells too. When this happens, the person will
have an auto immune disease. The body believes its own cells are unhealthy. If someone has
this disease it can cause a variety of problems and must be controlled by medication
Finally, reducing stress and getting enough sleep are two ways in keeping the immune system
healthy. The immune system will begin to break down if the body gets less than five hours
sleep, and stress also slows down the immune system.
In summary, the immune system is important for keeping the body healthy and strong.​

Answer 1

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Answer 2

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