ANSWER KEY X ICSE BATCH I II III

ANSWER SHEET X-ICSE II BIOLOGY WEEKLY EXAM ( AIDS TO HEALTH )


Question 1. (i) Salk’s Vaccine (ii) Antigen (iii) Antibiotics (iv) Virus (v) Natural/Innate immunity

(vi) DPT

Question 2. A. Antiseptic are chemical substances applied on the skin which prevent growth of bacteria. Example Lysol.

B. Vaccine is a germ or germ-killing substance which when introduced in our body stimulate the WBCs to produce antibodies against germs for that particular disease.

c. Antibiotic is a chemical substance produced by micro-organisms, which inhibits or kills another micro-organisms. Example- Penicillin extracted from Pencillium notatum

Question 3. A. Diptheria (bacteria- rest all are viral diseases) B. Penicillin ( It is an antibiotic and rest all are vaccines ) C. Plasmodium ( It is a protozoa and all others are bacteria ) D. Carbolic acid ( It is an antiseptic and all others are disinfectants )

Question 4. Vaccine Serum i. It is germ or germ-killing substance i. It is plasma minus fibrinogen protein ii. It helps in production of antibodies. Ii. It contains antibodies.

Antiserum Antivenin

Question 5.

Question 6. The merits of local defense system are-

a. They start working instantaneously.

b. They are not dependent on previous exposure to infections.

c. They are effective against a wide range of potentially infectious agents.

Question 7. Sulphonamides are a group of synthetic medicines which contain sulpha and amine group and which interfere with the metabolism of bacteria and finally killing them.

Example- Sulphadiazine and Sulphanilamide.

Question 8.

a. False. Human beings can suffer from some diseases which attack dogs.

b. False. Antibodies bind up the germs.

c. False. Lysol is an antiseptic.

d. True.

e. False. Treatment by the use of chemicals is known as chemotherapy.

Question 9. Four uses of antibiotics are-

a. Used as medicine against various infections.

b. Used as food preservatives.

c. Treating animal feed to prevent internal infections.

d. Controlling plant pathogens.

Question 10 Different ways of local defense in our body are-

1. Protective or mechanical barriers- Skin, hair, mucus, etc.

2. Germ – killing secretions

a. Saliva, sweat, tears and nasal secretions.

b. Hydrochloric acid.

3. White blood cells- Phagocytes.

ANSWER SHEET

X-ICSE I BIOLOGY WEEKLY EXAM (TRANSPIRATION & HEALTH ORGANIZATION)

Question 1. i. ii. WHO iii. Nerium iv. Anti-transpirant v. Hydathodes vi. Red Cross

Question 2 WHO Red Cross

i.
Question 3. i. To extend all possible first-aid in any accident. ii. To procure and supply blood for the needy victims of war or other calamities. iii. To educate people in accident prevention. iv. To look after maternal and child welfare centers.

Question 4. i. To promote and support projects for research on diseases. ii. To lay pharmaceutical standards for important drugs , to ensure purity and size of the dose.

Question 5. i. Xerophytes have their leaves modified to spines in order to curtail transpiration since these plants need to conserve water. ii. During day time when transpiration takes place due to opening of stomata in the leaves , these stomata allow the diffusion of carbon-dioxide in for the utilization by the plant during the photosynthesis. Thus we can say both the process are interlinked during daytime.

Question 6. The permanent adaptations which help a plant to grow in a dry climate are-

i. Sunken stomata ii. Fewer stomata iii. Narrow leaves iv. Reduce surfaces v. Loss of leaves vi Thick cuticle.