Hygiene Concise ICSE Class-9 Selina Biology Solutions

Hygiene A Key To Healthy Life Concise Selina Publishers Solved exercise answer Chapter-15

Hygiene Concise ICSE Class-9 Selina Biology Solutions Chapter-15 . We Provide Step by Step Answer of Progress Check , MCQs, Very Short Answer Type, Short Answer Type, Long Answer Type and Structured / Applications / Skill Type Questions of Exercise-15 Hygiene A Key To Healthy Life. Visit official Website  CISCE  for detail information about ICSE Board Class-9

Hygiene Concise ICSE Class-9 Selina Biology Solutions Chapter-15 A Key To Healthy Life

–: Select Topics :–

1_Progress Check (page-151),

2_Progress Check (page-153),

3_Progress Check (page-154),




Note :-  Before Viewing Concise Solutions of Chapter-15 Hygiene A Key To Healthy Life. Read the whole chapter carefully with figure. Focus on  brief introduction to maintaining good health  . General idea of personal hygiene, public hygiene and sanitation. Modes of transmission : air borne , water borne , vectors (housefly, mosquito, cochroach) in Hygiene A Key To Healthy Life.

1_Progress Check (page-151), Chapter-15 Hygiene-A Key To Healthy Life Selina Solutions Biology 

Question 1

progress check_1 Chapter-15 Hygiene Selina Biology Solutions

Answer 1

(i) Personal

(ii) Nose , mouth

(iii) Oxygen

(iv) Ear , eardrum

(v) Sleep

(vi)Drinking water ,sewage

Question 2

List ………………………….. bath.

Answer 2

The three advantages are as follows

It keeps the skin clean and germ -free.

Eliminates body odours given out by perspiration

Keeps the sweat pores open


2_Progress Check (page-153), Solutions of Selina Publishers Concise Biology Chapter-15 Hygiene 

 Question 1

progress check 2 Chapter-15 Hygiene Selina Biology Solutions

Answer 1

Culex————– Yellow fever
Anopheles———–malaria True
Gambusia—–eat up mosquito


Rat flea——— diarrhea
Cockroaches—-breed in man holes True

  3_Progress Check (page-154), Concise Solutions Selina Publications of Chapter-15 Hygiene 

Question 1

Mention if the following statement are True (T) or False (F)

(i)Contamination…………………….. bite.



(iv)Typhoid…………………………………. Worm.

(iv) Mosquitoes……………………………… germs.

Answer 1


Contamination means entry of germs into drinking water or edible foods

(ii)…… True



Typhoid is caused by a bacteria


Dysentery can be caused by bacteria or protozoans.

  Review Question

Solutions of A. MULTIPLE CHOICE TYPE  Chapter-15 Hygiene- A Key To Healthy Life Selina Biology Solutions

Question 1

No urination due to shortage of water in the body is a typical symptom of

(a) typhoid

(b) malaria

(c) dysentery

(d) cholera

Answer 1

(d) cholera

Question 2

Which one of the following is an unhealthy habit?

(a) Removing wax from inside the ears

(b) Keeping the mouth closed while breathing

(c) Sleeping for only 6-7 hours

(d) Sharing towels with others

Answer 2

(d) Sharing towels with others

Question 3

The protozoan that causes malaria is:

(a) Entamoeba histolytica

(b) Euglena

(c) Paramecium

(d) Plasmodium

Answer 3

(d) Plasmodium

Question 4

The chemical substance mainly responsible for tooth disorders is

(a) Calcium

(b) Chloride

(c) Fluorides

(d) Iodides

Answer 4

(c) Fluorides

Question 5

Typhoid is caused by

(a) Housefly

(b) Bacteria

(c) Virus

(d) None of the above

Answer 5

(b) Bacteria

Question 6

The germ causing Hepatitis is transmitted through

(a) the bite of a mosquito

(b) contamination of food by a housefly

(c) personal contact with a patient

(d) contaminated water

Answer 6

(d) contaminated water

Concise Selina Solutions Chapter-15 Hygiene, A Key To Healthy Life B. VERY SHORT ANSWER TYPE

Question 1

Match Column I with that which is most appropriate in Column II.

Column I Column II
(a) Mosquito (i) DDT
(b) Plasmodium (ii) Dengue
(c) Entamoeba
(iii) Vector
(d) Aedes
(iv) Malaria
(e) Insecticide (v) Dysentery


Answer 1

Column I Column II (Answers)
(a) Mosquito (iv) Malaria
(b) Plasmodium (iii) Vector
(c) Entamoeba
(v) Dysentery
(d) Aedes
(ii) Dengue
(e) Insecticide (i) DDT


Question 2

Name the following:

(a) Organisms that transmit microbes that cause disease.

(b) Organisms that cause disease.

(c) Science of maintaining good health.

Answer 2

(a) Vectors (disease carriers)

(b) Pathogens

(c) Hygiene

Question 3

Describe the different ways by which the housefly contaminates our food.

Answer 3

The different ways by which the housefly contaminates our food:

(i) Hairy body and legs: Hairy or spiny body and legs easily pick up dirt containing germs from unhygienic places such as rotten materials, infected wound or faecal matter. When these flies sit on our food, they rub their legs continuously dropping the particles of dirt onto the food, thereby contaminating it.

(ii) Pouring out saliva: When the housefly pours its saliva or regurgitates on food, foodstuffs get moistened and pathogens get deposited on them. This results in their contamination.

(iii) Excreta: While feeding on food items, houseflies may deposit their excreta on food, contaminating it.

(iv) Direct transmission of germs: In some cases, houseflies directly transmit the pathogens. In case of eye disease trachoma, pathogens are transferred from an infected person to a healthy person, when a fly settled on an infected eye of a person sits on the eyes of a healthy person.

Question 4

Suggest any two methods of controlling flies.

Answer 4

Two methods of controlling flies:

Spraying of insecticides

Elimination of breeding grounds

Question 5

List any three effective methods for controlling mosquitoes.

Answer 5

Effective methods for controlling mosquitoes:

(i) Spraying insecticides

(ii) Food should be protected by covering it

(iii) Eliminating breeding places of mosquitoes

Question 6

Name the two common kinds of mosquitoes and the diseases they transmit.

Answer 6

Kind of
by it
Anopheles Malaria
Culex Filariasis


Question 7

Mention any three ways by which potable water can be contaminated.

Answer 7

Contamination of potable water can occur due to

Improper disposal of sewage

Defecation and urination near lakes, rivers or ponds

Drainage of animal wastes and washings from dairies and poultries into water bodies

 C. LONG ANSWER TYPE Selina Biology Solutions of Chapter-15 Hygiene A Key To Healthy Life

 Question 1

Give suitable explanations for the following :

(i) One should breathe by nose and never by mouth.

(ii) Hands must be washed before eating food.

(iii) Eating places must be kept free of flies.

Answer 1

(i) Reason why One should breathe by nose and never by mouth.

  One should breathe by nose and never by mouth because nose contains hair and mucous to trap dust and micro-organisms, so that the inhaled air becomes pure and the respiratory passage is free of dust and micro-organisms.

(ii) Reason why Hands must be washed before eating food.

  We handle a variety of things like books, coins, furniture, tools and machinery in workshops, seats and supporting rods in buses and even pets and other domestic animals in our day-to-day life. Many of these objects carry germs. These germs can be picked up by us, when we touch these objects and get transferred to other parts of our body or into our mouth, when we eat our food. Therefore, it is necessary to wash our hands before eating food to avoid the spread of diseases caused due to these germs.

(iii) reason why Eating places must be kept free of flies.

  Flies are carriers of many disease-causing germs and bacteria. Therefore, eating places must be kept free of flies to avoid possible contamination of food.

Question 2

How are cockroaches and rats harmful to humans?

Answer 2

Cockroaches and rats are common household pests.

(i) Cockroaches are involved in spoiling food, paper and cloth. They may act as carriers of viruses, especially those which cause cancer.

(ii) Rats eat grains and other foods. They also act as carriers of certain pathogens. A parasite named rat-fleas lives on rat’s skin. It possibly carries the germs of plague.

Question 3

Name the two types of dysentery and their causative germs and give one main precaution against them.

Answer 3










1. Bacillary dysentery Bacterium:
2. Amoebic dysentery Protozoan:
Avoiding contaminated water and


Question 4

Mention three symptoms of the disease Hepatitis.

Answer 4

Symptoms of Hepatitis:

Body ache,Yellow eyes, Deep yellow urine, Enlarged liver

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