General Science Solutions Solutions for Class 8 Science Chapter 2 - Health And Diseases

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A. Malaria, hepatitis, elephantiasis, dengue- Hepatitis is the odd one out because it is a type of viral infection while the rest of three are spread through the bite of mosquitoes.
B. Plague, AIDS, cholera, T.B. - AIDS is the odd one out because it is a viral disease while the rest of them are bacterial diseases.

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a. Boiling and filteration are methods of purifying water which makes it suitable for consumption. Drinking boiled and filtered water can help in prevention of water borne diseases such as typhoid, cholera, etc. Most of the water borne diseases are transmitted through the consumption of contaminated water in some or the other form. 

b. Smoking and alcoholism are two of the devils of our health and society. Smoking leads to various kinds of respratory disorders and hinders the process of respiration. It can lead to diseases such as lung cancer. On the other hand, consumption of alcohol, effects the nervous as well as the digestive system of our body. Avoiding alcohol and smoking can protect indivisuals from various diseases and can help in living a healthy and stress free life.

c. Balanced diet and exercise are key to good health. Both of these in combination helps our systems to function properly, helps maintain a healthy weight, reduces body fat, provides the body with energy, promotes good sleep and makes us feel better about ourselves.

d. Proper checking of blood before blood donation is required to check that the blood to be transferred is safe in all respects. There are chances of transfer of infectious diseases form the donor, if he/she is suffering from any such diseases. Another important factor for checking of blood before donation is to check that the donor is not anemic (does not have anemia). 

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a. Since, the house of master X is near the toilet and he lives in a slum area, the chances are that there is less cleaniliness in that area. There are chances that he may suffer from diseases like salmonellosis, shigellosis, diarrhoea, trachoma, gastroenteritis, giardiasis, tapeworm infection and threadworm infection.

b. In this case, the famliy needs to be made aware about cleanliness in and around their houses. There is a need to explain them the importance of balanced diet for them and their child. Since, the father is a drukyard, he needs counselling and treatment to get rid of the habit of alcoholism.

c. The father of master X is a drunkyard which means he might suffer from diseases such as heart diseases, liver cirrhosis, ulcers and gastrointestinal ptoblems, brain damage etc.

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 a. Dengue is a mosquito borne disease which is transmitted by Aedes mosquitoes which grow in clean and stagnant water. The breeding of this mosquito can be prevented by adopting the following steps:

• larve-eating fishes should be introduced in ponds
• collection and storage of water should always be done in closed vessels
• potted plants should have proper drainage to avoid collection of water in the pots
• pesticides should be used against mosquitoes as and when required

• have a healthy diet
• exercise regularly
• avoid smoking and alcohol
• go for regular health checkups

• avoid sexual contact with unknown persons
• screening of blood before transfusion
• avoid sharing of needles

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a. A balanced diet is a diet containing all nutrients (carbohydrates, fats, proteins, vitamins, etc.) in the right quantities. A balanced diet helps us in various ways:

• provides us with important nutrients required for the growth of body
• helps us to stay fit and free from diseases
• helps in strengthening the immune system
• helps our systems to function properly
• helps maintain a healthy weight
• reduces body fat
• provides the body with energy
• promotes good sleep and makes us feel better about ourselves

• reduces the risk of heart attack
• helps in managing weight better
• helps in maintaining blood cholesterol level
• lowers the risk of type 2 diabetes and some cancers
• helps in maintaining the blood pressure levels
• helps in attaining stronger bones, muscles and joints and lowers the risk of osteoporosis
• boosts the energy levels, makes you feel relaxed

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Diagnostics of cancer:

There are many techniques whiich are used in the diagnosis of cancer and their application depends upon the type of cancer. Biopsy, histopathological studies of bone and blood, radiography (use of X-rays), CT (computed tomography) and MRI (magnetic resonance imaging) are used in diagnosis of cancer. Radiography, CT and MRI are the modern techniques used in cancer diagnosis.
Computed tomography uses X-rays to generate a three-dimensional image of the internals of an object. MRI uses strong magnetic fields and non-ionising radiations to accurately detect pathological and physiological changes in the living tissue.

Treatment of cancer:

Cancer is treated using 3 major approaches depending on the type of cancer. These 3 approaches are- surgery, radiotherapy and chemotherapy. In surgery, the tumor is removed surgically from its site and can be used in specific cases only. Radiotherapy is a technique in which the cancer cells are irradiated with radiations taking care of the normal tissues which surround the cancer cells.
Chemotherapy uses different kinds of drugs for the treatment of cancer. These chemotherapeutic drugs are specific for particular tumors and have side effects such as hair loss, anemia, etc.
Most of the cancers are treated by the combination of these 3 approaches.

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The following medicines are found in our houses:

Paracip- Paracetamol/Acetaminophen
Digene-  Dried Aluminium Hydroxide, Magnesium Aluminium Silicate Hydrate, Magnesium Hydroxide, Simethicone
Volini- Diclofenac diethylamine BP, Linseed Oil BP (Oleum Lini), Methyl salicylate, Menthol IP, Benzyl Alcohol IP.
Vomikind- Ondansetron