FRANK Solutions for Class 9 Biology Chapter 21 - Health: Personal and Social
Chapter 21 - Health: Personal and Social Exercise 203
The major aspects of personal hygiene are:
(ii) Physical exercise
(iii) Rest and sleep
(iv) Healthy habits
(v) Balanced diet
(i) Mosquitoes can be controlled by spraying liquid insecticides like flit or D.D.T.
(ii) The breeding places of mosquitoes are sprayed with petroleum oils. The oil-film formed on the surface of water is toxic to the mosquito larvae.
(iii) Mosquito-repellents like mosquito cream, citronella, odomos and indalone help to keep mosquitoes away and protect us from getting bitten.
Culex - Encephalitis
Rat flea - Plague
DDT - Contamination
Housefly - Filaria
Cockroach - Gastroenteritis
Cholera - Vibrio
Giardia - Protozoan
Faeces - Cholera
(i) Eating a balanced diet. A diet in adequate quantity and well-balanced, protects a person from several diseases and keeps him fit to work with efficiency.
(ii) Getting sound sleep by waking up and sleeping at the regular times
(iii) Avoiding smoking and drinking of alcohol
(iv) Having proper control over emotions like anger and hatred.
Example - Our hands handle variety of things which may contain pathogens left by other infected persons. If these germs are not removed, they may enter our body and cause diseases. Hence it is important to wash hands with soap at regular intervals and especially before eating and after going to toilet.
(a) Flies should not be allowed to sit on edible things.
(b) Hands must be cleaned thoroughly before eating food.
(c) We should not put on other persons cloths.
(d) We should breathe through our nose only.
(e) Our kitchen should be free from flies and cockroaches.
(b) Our hands handle variety of things which may contain pathogens left by other infected persons. If these germs are not removed, they may enter our body and cause diseases. Hence it is important to wash hands with soap before eating to prevent spread of diseases.
(c) Clothes of another person may contain germs of various diseases left by that person. Wearing those clothes could cause the transmission of the disease to us. Hence it is not advisable to wear other people's clothes.
(d) Nose has hair and mucus to filter the air coming through it while breathing. This traps dust, germs and other foreign particles and prevents them from reaching the lungs. Hence we should always breathe through nose.
(e) Flies and cockroaches transmit germs of many diseases. Hence they should be kept away from our kitchens so as to prevent spread of diseases.
(ii) Flies. They can be controlled in following ways:
(a) Removing human faeces, stable manure and garbage at regular intervals and disposing them off
(b) Killing adult flies by using fly swatters, spraying D.D.T, chlordane etc. or some other chemicals like pyrethrum, B.H.C etc.
(a) Any disease caused by rats.
(b) Any two diseases transmitted by housefly.
(c) The chemical by which you can kill rats.
(d) Name of diseases caused by cockroach.
(b) Cholera and dysentery
(c) Zinc phosphate
(d) Gastroenteritis, dysentery
Chapter 21 - Health: Personal and Social Exercise 204
(b) Typhoid - It is caused by the bacterium Salmonella typhi I . Infection occurs through consuming of contaminated food and water. Symptoms include headache, high fever, tender and distended abdomen, diarrhea with water green stools and eruption of rash on body of patient.
Prevention methods include proper sanitation and disposal of faecal matter and vaccination.
(c) Amoebiasis - It is caused by a protozoa, Entamoeba Histolytica. It is commonly spread by water contaminated by faeces or from food served by contaminated hands. Symptoms include - lower abdominal pain, diarrhoea and later develop dysentery and fever.
Prevention methods include proper sanitation and drinking clean water.
(d) Giardiasis - It is caused by the protozoan flagellate Giardia intestinalis, which lives in upper parts of human intestine. It perches on living cells of intestinal wall with adhesive discs, absorbing nutrition from food passing by, growing and multiplying. They interfere with digestion, causing pain, diarrhea, headache and fever. Preventive measures include consuming boiled water, maintaining hygiene and sanitation as well as practicing personal hygiene.
(e) Hepatitis - It is caused by hepatitis virus. There are six varieties hepatitis A, B, C, D, E and F. Symptoms include enlarged liver in early stage, fever, anorexia, vomiting, epigastric, discomfort, pain in muscles and joints. Later on liver becomes smaller and yellowish or greenish. Some forms of hepatitis spreads through contaminated water and food whereas others spread through body fluids.
(i) Community health service includes
(a) School and health education
(b) hygienic environment
(c) Control of communicable disease
(d) all the above
(ii) Community health aims at
(a) care of the infants and old
(b) care of uniforms
(c) Health for all
(d) improving children's health
(iii) Mosquitoes larvae can be controlled by using:
(a) Salmon fish
(c) Dog fish
(d) none of the above
(ii) (c) Health for all
(iii) (b) Gambusia
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