Selina solutions concise biology class 9 icse Solutions for Chapter 15 hygiene

Exercises in Chapter 15 hygiene Grade 9

Exercise

Questions in Exercise

Fill in the blanks (i) Cleanliness, rest and sleep, and physical exercise are a part of ________ hygiene (ii) One must always breathe by the _______ and never by the ________ (iii) Fresh air brings __________ into the living rooms. (iv) One must never put a sharp pointed object into the _______ it may rupture the

(v) For adults 6-7 hours of continuous undisturbed _______ is sufficient. (vi) The municipal bodies must ensure the supply of clean germ-free ________ and an efficient _________ disposal.

List any three advantages of a daily bath.

Tick-mark the correctly matched pairs of certain animals and the related diseases/habits. (i) Culex ____________ yellow fever (ii) Aedes ____________filarial (iii) Anopheles _________malaria (iv) Gambusia _________ eat up mosquito larvae (v) Rat flea ___________diarrhea (vi) Cockroaches ________breed in man-holes

Mention if the following statements are true (T) or false (F)

(i) Contamination means entry of germs by insect bite T/F

(ii) Sewage is the commonest source of contamination of water in the cities T/F

(iii) Cholera is marked by acute diarrhea and no urination T/F

(iv) Typhoid is caused by a type of worm T/F

(v) Mosquitoes are the source of dysentery germs T/F

No urination due to shortage of water in the body is a typical symptom of (a) Typhoid (b) Malaria (c) Dysentery (d) Cholera

Which one of the following is an unhealthy habit?

(a) Removing wax from inside the ears

(b) Keeping the mouth closed while breathing

(d) Sharing towels with others

The protozoan that causes malaria is:

(a) Entamoeba histolytica

(b) Euglena

(d) Plasmodium

The chemical substance mainly responsible for tooth disorder is

(a) Calcium

(b) Chloride

(d) Iodides

Typhoid is caused by (a) Housefly (b) Bacteria (c) Virus (d) None of the above

The germ causing Hepatitis is transmitted through:

(a) The bite of a mosquito

(b) Contamination of food by a housefly

(d) Contaminated water

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 histolytica (iii) Vector (d) Aedes mosquito (iv) Malaria (e) Insecticide (v) Dysentery

Name the following:

(a) Organism that transmit microbes that cause disease.

(b) Organisms that cause disease.

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

Suggest any two methods of controlling flies.

List any three effective methods for controlling mosquitoes.

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

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

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

How are cockroaches and rats harmful to humans?

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

Mention three symptoms of the disease Hepatitis

Match the diseases in Column I with their categories in Column II

Classify the following diseases into communicable and non-communicable diseases: cholera, beri-beri, colour blindness, diabetes, malaria, plague, heart-attack. (i) Communicable ________ (ii) Non-communicable _________

A disease widely spread worldwide is known as (a) Endemic (b) Epidemic (c) Pandemic (d) Sporadic

The letter “B” in the name BCG vaccination stands for: (a) Brief (b) Beri-beri (c) Bacteria (d) Bacillus

Use of disposable syringes for injecting medicines, etc. is especially advised to prevent (a) Poliomyelitis (b) Mumps (c) Rabies (d) AIDS

The vector that transmits the malarial pathogen is: (a) Culex mosquito (b) Housefly (c) Anopheles mosquito (d) Entamoeba