Selina solutions concise biology class 9 icse Solutions for Chapter 17 aids to health

Give one example of each of the following: (i) Germ killing body secretion. (ii) Germ trapping body secretion (iii) Mechanical barrier that prevents the entry of germs into the body.

Mention of the following statements are True(T) or false(F)

(i) Immune system deals with the germs after they have entered the body.

(ii) Antibodies eat up the germs

(iii) Human beings can suffer from all those diseases which attack dogs

(iv) Anti-venin injection against snake bite is an example of artificially acquired passive immunity.

(v) Mother’s antibodies may reach the fetus through the placenta

(vi) A person having once suffered from measles usually gets repeated attacks.

Define the term prophylaxis

Name the four categories of materials used for preparing vaccines

Name the diseases prevented by: (i) Salk’s vaccine (ii) BCG vaccine (iii) DTP vaccine

Correct the following statements if they are false (without changing the first word). (i) DDT is an antiseptic. (ii) Penicillin is a disinfectant. (iii) Disinfectants are applied on the body (iv) Deodorants are both antiseptic as well as disinfectants (v) Alexander Fleming discovered the first sulphonamide (vi) Antibiotics cannot be made synthetically (vii) Sulphonamides are now rarely used.

List any three uses of antibiotics

Penicillin is (a) An antiseptic (b) A disinfectant (c) An antibiotic (d) An anti-toxin

“T” in DTP vaccination stands for (a) Tuberculosis (b) Typhoid (c) Tetanus (d) Tonsillitis

World Healthy Day is celebrated on (a) April 7 (b) February 21 (c) October 10 (d) January 15

DTP stands for

(a) Diphtheria, Polio and Tetanus

(b) Diphtheria, Pertussis and Tetanus

(c) Dysentery, Polio and Typhoid

(d) Diphtheria, Polio and Typhoid

Vaccines are: (a) An extract of toxins secreted by bacteria (b) An extract of dead and weakened microbes (c) Strong chemicals obtained from fungi (d) Chemicals that are applied to the skin to kill bacteria.

Name the following:

(a) The drug based on arsenic compound, produced in 1910 which killed germs of syphilis.

(b) The antibiotic that was discovered first.

(c) The category of immunity required in the treatment of snake-bite.

(d) Any four antiseptics, any two disinfectants and any two antibiotics.

(e) The vaccines that help to produce immunity against Polio.

Write the full forms of: (i) AIDS (ii) BCG (iii) DPT vaccine (iv) WHO (v) HIV (vi) ATS (vii) TAB (viii) STD

Give the technical term for the kind of proteins produced in the blood to fight and destroy harmful microbes

Mention if the following statements are true (T) or false (F). (a) Lysol is an antibiotic. (b) Sweat and tears contain germs-killing substances. (c) Our body can make only a limited variety of different antibodies (d) Salk vaccine is used against tuberculosis (e) Treatment by the use of chemicals is known as allopathy (f) Alexander Fleming coined the term “antibiotic” for substances like penicillin. (g) DDT is a disinfectant. (h) Vaccine provides the body with Active Immunity (i) Penicillin was discovered by Alexander Fleming. (j) BCG is the vaccine given to babies to help build immunity against three common diseases.

Differentiate between: (a) Antiseptic and antibiotic (b) Antiseptic and disinfectant (c) Disinfectant and deodorant (d) Vaccination and sterilization (e) Active Immunity and passive immunity (f) Innate immunity and acquired immunity

Name any three vaccines and the diseases for which they provide immunity.

Given below are a table of certain vaccines, the diseases against which they are used, and the nature of the vaccine. Fill up the gaps 1 – 10

Given below are the groups of certain substances of particular categories. Mention the category of each group and identify the wrong example giving a reason. (a) Lysol, benzoic acid, DDT, mercurochrome. (b) Formalin, Iodine, Lysol, Phenol (c) BCG, DTP, ATP. (d) Tears, Skin, Nasal Secretion, HCl (in the stomach)

Given below is a scheme of classifying immunity against human diseases. Fill up the types of immunity in the blanks 1-9.

List any four ways in which the antibiotics are being used.

List the merits of local defence system.

Suppose a person develops the disease diphtheria. Comment upon the principle of the treatment he should receive.

The principle of vaccination is to produce immunity against a disease. Explain

“Abnormally, a large number of WBC’s in the blood is usually an indication of some infection in our body”. Comment on the statement.

Explain briefly, the role of the following health aids: (a) Antiseptics (b) Disinfectants (c) Vaccines