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Prevention and treatment of disease - class-XI

Description: prevention and treatment of disease
Number of Questions: 48
Created by:
Tags: health and disease medicinal chemistry soldiers of defense chemistry biology useful and harmful microbes aids to health human health and disease
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A protoxin is 

  1. A primitive toxin

  2. A denatured toxin

  3. Toxin produced by protozoa

  4. Inactive toxin.


Correct Option: D
Explanation:

A protoxin is an inactive toxin which is converted to an active form by the alkaline pH present in the gut of insects.

So, the correct option is 'Option D' .

Anti-toxins are used to induce

  1. Death

  2. Passive immunity

  3. Diseases

  4. None of the above


Correct Option: B

Antitoxin is a special type of

  1. Antibody

  2. Antigen

  3. Disease

  4. None of the above


Correct Option: A
Explanation:

An antitoxin is a type of antibody that are produced by the other animal and used to neutralize the specific toxins. Antitoxins are used prophylactically and therapeutically.

The probiotic drinks such as 'Yakult' contains healthy bacterial suspension. They are used for boosting the immune system and strengthening the digestive systems. The mechanisms by which they do it might be by?

  1. By generating antibody against them

  2. By generating toxins which kill other bacteria

  3. They divide in the gut faster and replace the existing harmful bacteria

  4. They eat the harmful bacteria


Correct Option: B
Explanation:

Probiotics are live organisms intended to provide health benefits when consumed, generally by improving or restoring the gut flora (microorganisms present in the gut). Yakult is a delicious probiotic fermented milk drink that contains exclusive L.casei strain. Probiotics, when entered into the body generates toxins which help in the elimination of other harmful bacteria.

Thus, the correct answer is 'By generating toxins which kill other bacteria.'

Cause of death in snake bite cases usually involve

  1. Neurotoxicity

  2. Destruction RBC's

  3. Permanent contraction of muscles

  4. Both A and B


Correct Option: D
Explanation:

Snake bites affects the nervous system at the places where nerves connect to muscles, thereby failure of nerves. It also affects the circulatory system by causing destruction of RBCs or causing blood clotting. 

Therefore, the correct answer is option D.

The best medicine to inject into the snake bite case, is

  1. Penicillin

  2. Antivenin

  3. Antibiotic

  4. Streptomycin


Correct Option: B

The best medicine for snake bite is 

  1. Antiseptic

  2. Antivenom

  3. Antibiotic

  4. Atreptomycin


Correct Option: B
Explanation:

Any injury caused by the biting of a snake is called a snake bite. It is usually poisonous. A common sign of snakebite is the presence of two wounds from snake's fangs. Snakebite delivers poison to the person it bites. This poison has to be nullified through anti-venom drugs. Antivenom is a medicine made from antibiotics. It is used to treat snake bites.

So, option B is the correct answer.

Which of the following systems in man is affected by the bite of cobra?

  1. Digestive

  2. Nervous

  3. Excretory

  4. Circulatory


Correct Option: B
Explanation:

The venom of cobra consists primarily of neurotoxins (affects the nervous system) with several other compounds. They are capable of delivering a fatal bite. These block the transmission of the nerve impulse by the sensory and motor neurons. So, the correct answer is option B.

Antivenom injections used for treating snake bite are prepared at

  1. IVRI, Bareilly

  2. NDRI, Kamal

  3. Haffkine Research Institute, Mumbai

  4. IARI, New Delhi


Correct Option: C
Explanation:

Antivenin or anti-snake venom serum is the only drug that can neutralise the snake venom and the victim. It should be injected soon after the bite. They are prepared by immunising horses and mules against the venoms of various types of venomous snakes. These antivenins are prepared in India at Haffkine Institute, Mumbai and Central Research Institute, Kasauli.
So, the correct answer is option C.

Select the mismatched one.

Drug Source Application
$(1)$ Taxol Bark of Yew Anticancerous
$(2)$ Liquorice Leaves of Glycine max Bronchitis
$(3)$ Quinine Bark of Cinchona ledgeriana Antimalarial
$(4)$ Reserpine Roots of Rauwolfia serpentina Against schizophrenia
  1. A

  2. B

  3. C

  4. D


Correct Option: B
Explanation:

Liquorice or licorice is the root of Glycyrrhiza glabra from which a sweet flavour can be extracted. Licorice is taken by mouth for various digestive system complaints including stomach ulcers, heartburn, colic, and ongoing inflammation of the lining of the stomach (chronic gastritis). 

So, the correct option is 'B'.

Penicillin was discovered by 

  1. S. Waksman

  2. Robert Koch

  3. Louis Pasteur

  4. Alexander Fleming


Correct Option: D
Explanation:

Penicillin is a secondary metabolite of certain species of Penicillium and is produced when the growth of the fungus is inhibited by stress. It is not produced during active growth. Production is also limited by feedback in the synthesis pathway of penicillin. It was discovered by Alexander Fleming.

So, the correct option is 'Alexander Fleming'.

Resistance to antibiotics may occur by

  1. Impermeability to the antibiotic

  2. Production of increased levels of the sensitive enzyme

  3. Production of a recombinant enzyme that is insensitive to the antibiotic

  4. All of the above


Correct Option: D
Explanation:

When the microbe alters in such way that reduces the effectiveness of drug or chemicals to prevent infection and microbes multiply continuously is called as antibiotic resistance. This situation can have occurred due to a continuous supplement of particular antibiotic, production of recombinant enzymes and ineffectiveness of antibiotic. Thus, the correct answer is option D.

Which of the following was used by Alexander Flemming to prepare an antibiotic to kill bacteria?

  1. Rhizopus

  2. Yeast

  3. Mushroom

  4. Penicillium notatum


Correct Option: D
Explanation:

Penicillin is an antibiotic or the drug produced by the fungal species Penicillium notatum. The antibiotic is very useful in the treatment of the infections caused by Streptococcus and Staphylococcus species. This antibiotic was discovered by Alexander Flemming. 

Thus, the correct answer is option D. 

Cresol, phenol, lysol are common

  1. Disinfectants

  2. Antiseptics

  3. Antibiotics

  4. Antibodies


Correct Option: A
Explanation:

Disinfectants are the chemical or antimicrobial substance that are applied to non-living objects such as floor to kill microbes e.g., phenol, lysol, cresol etc.

Antiseptics can

  1. Protect the body from entry of germs

  2. Kill germs

  3. Has no effect on germs

  4. All of the above


Correct Option: B
Explanation:

Antiseptics are mild chemical substances which when applied on the body, kill germs. These substances are in such mild concentration that they cause no harm to the skin and body e.g., lysol, carbolic acid (phenol).

Disinfectants are

  1. Biological substances

  2. Enzymes

  3. Chemical substances

  4. Hormones


Correct Option: C
Explanation:

Disinfectants are the chemical or antimicrobial substance that are applied to non-living objects such as floor to kill microbes e.g., phenol.

Sulphonamides were used to treat microbial infection because they inhibit microbial growth by

  1. Inhibiting wall formation

  2. Competing with PABA required for synthesis of folic acid

  3. Breaking naked DNA of microbes

  4. Inhibiting union of ribosome subunits and preventing protein synthesis


Correct Option: B
Explanation:
A folic acid or folate used to synthesize nucleic acid. Sulpha drugs inhibit the enzyme dihydropteroate synthase by attaching on the active site. DHPP and p-aminobenzoic acid (PABA) reacts in the presence enzyme dihydropteroate synthase for the synthesis of folic acid in bacteria. The sulphonamides compete with the PABA required for the synthesis of folic acid.
So, the correct answer is option B.
A chemical used for preventing pathogenic growth in wounds
  1. Antiseptic

  2. Photolysis

  3. Growth rate of population

  4. Pollutant

  5. Trophic hormone


Correct Option: A
Explanation:

(A)Antiseptic is capable of preventing microbial infection

(B)Photolysis is a chemical reaction in which a compound is decomposed after absorbing a photon
(C)The growth rate of population is the measure of the number of individuals
(D)The pollutant is the unit that causes pollution
(E)A trophic hormone is a hormone that stimulates endocrine gland
So, the correct answer is 'Antiseptic'

Agents used to kill microbes on living surfaces are called

  1. Disinfectant

  2. Tranquilizers

  3. Antiseptic

  4. Both A and C


Correct Option: C
Explanation:

Disinfectants are antimicrobial agents, that are applied to non-living objects to destroy microorganisms.
Tranquilizers are drugs used to reduce anxiety, fear, tension, agitation and mental disturbances.
Antiseptics are the mild antimicrobial chemical substances, that are applied to living tissue/skin to reduce the possibility of infection, sepsis.
Thus, the correct answer is option C.

Antiseptics are

  1. Mild chemical substances

  2. Strong chemical substances

  3. Weak catalysts

  4. Strong enzymes


Correct Option: A
Explanation:

Antiseptics are the mild chemical, antimicrobial substance. It is make mild so that it cannot harm the tissues. It is applied to tissues or skin to reduce the infection e.g., hydrogen peroxide.

Antiseptics are 

  1. Taken orally

  2. Intravenously

  3. Applied on skin

  4. All of the above


Correct Option: C
Explanation:

Antiseptics are mild chemical substances which when applied on the skin to kill germs. These substances are in such mild concentration that they cause no harm to the skin and body. Lysol, carbolic acid (phenol). Thus, the correct answer is option C.

Which of the following is an antiseptic?

  1. Lysol

  2. Carbonic acid

  3. Iodine

  4. All of the above


Correct Option: D
Explanation:

Antiseptics are mild chemical substances which when applied on the body, kill germs. These substances are in such mild concentration that they cause no harm to the skin and body e.g., lysol, carbolic acid (phenol), iodine. Thus, the correct answer is option D.

Benzoic acid in ---------- solution is a good antiseptic.

  1. Concentrated

  2. Dilute

  3. Both A and B

  4. None of the above


Correct Option: B
Explanation:

Antiseptics are mild or dilute chemical substances which when applied on the body, kill germs. These substances are in such mild concentration that they cause no harm to the skin and body. Lysol, carbolic acid (phenol), benzoic acid.

Antiseptics can

  1. protect the body from tentry of germs

  2. kill germs

  3. has no effect on germs

  4. all


Correct Option: B
Explanation:

These are mild chemical substances which, when applied on the body, kill germs. These substances are in such mild concentration that they cause no harm to the skin and body. Lysol, carbolic acid (phenol), Iodine, benzoic acid, Mercurochrome, boric acid etc in dilute solution are good antiseptics. Certain antibiotic creams also serve the same purpose.

Which of the following is not an antiseptic?

  1. Phenol

  2. Mercurochrome

  3. LSD

  4. None of the above


Correct Option: C
Explanation:
Lysol, carbolic acid(phenol),Iodine, benzoic acid,Mercurochrome,boric acid etc in dilute solution are good antiseptics.
LSD is one of the most potent, mood-changing chemicals. It is manufactured from lysergic acid, which is found in the ergot fungus that grows on rye and other grains.
So, the correct answer is 'LSD'

Mark the correct statement about disinfectants.

  1. All disinfectants are strong and should not come in contact with the human skin.

  2. Deodorants are neither antiseptics or disinfectants.

  3. Disinfectants are applied on spots and places where germs thrive and multiply.

  4. All of the above.


Correct Option: D
Explanation:

Disinfectants are the chemical or antimicrobial substance that are applied to non-living objects such as floor to kill microbes e.g., phenol. Deodrants are the substance used to remove unpleasant bodily odour. Thus, the correct answer is option D.

Mark the correct difference between antiseptic and disinfectant.

  1. Antiseptic are applied on the body whereas disinfectant are applied on spots.

  2. Antiseptic and disinfectant both are applied on spots.

  3. Antiseptic and disinfectant both are applied on body.

  4. Disinfectant are applied on the body whereas antiseptic are applied on spots.


Correct Option: A
Explanation:

Disinfectants are chemical agents used to disinfect inanimate objects and surfaces e.g., iodine solution, copper sulfate, ozone and chlorine gas. Antiseptics are chemical agents applied to living tissues to prevent infection e.g., hydrogen peroxide. Thus, the correct answer is option A.

Strong heat and boiling also destroy germs and may be called .......... disinfectants.

  1. Physical

  2. Chemical

  3. Biological

  4. All of the above


Correct Option: A
Explanation:

Disinfection is a process of sterilization (free from contamination). There are three types of disinfectant biological, chemical and physical. Heating, boiling and radiation comes under the physical disinfectant. Thus, the correct answer is option A.

Mark the correct statement.

  1. Antiseptic are strong germ killing substances.

  2. Iodine is an disinfectants.

  3. Phenol is a disinfectant.

  4. Disinfectant are applied on the body whereas antiseptic are applied on inanimate objects.


Correct Option: C
Explanation:

Disinfectants are chemical agents used to disinfect inanimate objects and surfaces e.g., phenol, cresol. Antiseptics are the mild chemical agents applied to living tissues to prevent infection e.g., hydrogen peroxide. Thus, the correct answer is option C.

Mark the incorrect statement about disinfectants.

  1. They are applied as ointment on skin.

  2. Deodorants only serve to mask a bad smell.

  3. Cresol is also a disinfectant.

  4. All of the above.


Correct Option: A
Explanation:

Disinfectants are the chemical or antimicrobial substance that are applied to non-living objects such as floor to kill microbes e.g., phenol, cresol. Deodrants are the substance used to remove the unpleasant bodily odour. Thus, the correct answer is option A.

Disinfectants are

  1. Biological

  2. Enzymes

  3. Hormones

  4. Chemical


Correct Option: D
Explanation:

These are strong chemical substances that are applied on spots and places where germs thrive an multiply and places where germs thrive and multiply.commonly used disinfactants are cresol, phenol, Lysol,40% formalin, lime, Bordeaux mixturr, DDT etc. Precaution-all disinfectants are strong and should not come in contact with the human skin. Strong heat and boiling also destroy germs and may be called physical disinfectants.deodorants are neither antiseptics nor disinfectants.they only serve to mask a bad smell.
So, the correct answer is D

Which of the following is an antiseptic

  1. Lysol

  2. Carbolic acid

  3. Iodine

  4. All


Correct Option: D
Explanation:

These are mild chemical substances which, when applied on the body, kill germs. These substances are in such mild concentration that they cause no harm to the skin and body. Lysol, carbolic acid (phenol), Iodine, benzoic acid, Mercurochrome, boric acid etc in dilute solution are good antiseptics. Certain antibiotic creams also serve the same purpose.

Mark the incorrect statement about disinfectants

  1. they are applied as ointment on skin.

  2. deodrants only serve to mask a bad smell.

  3. cresol is also a disinfectant

  4. all


Correct Option: A
Explanation:

These are strong chemical substances that are applied on spots and places where germs thrive an multiply and places where germs thrive and multiply.commonly used disinfectants are cresol, phenol, Lysol,40% formalin, lime, Bordeaux mixture, DDT etc. Precaution-all disinfectants are strong and should not come in contact with the human skin. Strong heat and boiling also destroy germs and may be called physical disinfectants.deodorants are neither antiseptics nor disinfectants.they only serve to mask a bad smell.

So, the correct answer is A

Mercurochrome is a type of

  1. Disinfectant

  2. Antibiotic

  3. Antiseptic

  4. All


Correct Option: C
Explanation:

These are mild chemical substances which, when applied on the body, kill germs. These substances are in such mild concentration that they cause no harm to the skin and body. Lysol, carbolic acid (phenol), Iodine, benzoic acid, Mercurochrome, boric acid etc in dilute solution are good antiseptics. Certain antibiotic creams also serve the same purpose. Dettol, savlon are all antiseptics.

So, the correct answer is 'Antiseptic'.

Deodorants are

  1. Both antiseptic and disinfectant

  2. Only disinfectant

  3. Neither antiseptic nor disinfectant

  4. Only antiseptic


Correct Option: C
Explanation:

These are strong chemical substances that are applied on spots and places where germs thrive an multiply and places where germs thrive and multiply.commonly used disinfectants are cresol, phenol, Lysol,40% formalin, lime, Bordeaux mixture, DDT etc. Precaution-all disinfectants are strong and should not come in contact with the human skin Strong heat and boiling also destroy germs and may be called physical disinfectants.deodorants are neither antiseptics nor disinfectants.they only serve to mask a bad smell.
So, the correct answer is  'Neither antiseptic nor disinfectant'.

Benzoic acid in ............... solution are good antiseptics.

  1. Concentrated

  2. Dilute

  3. Both

  4. None


Correct Option: B
Explanation:

These are mild chemical substances which, when applied on the body, kill germs. These substances are in such mild concentration that they cause no harm to the skin and body. Lysol, carbolic acid (phenol), Iodine, benzoic acid, Mercurochrome, boric acid etc in dilute solution are good antiseptics. Certain antibiotic creams also serve the same purpose. Dettol, savlon are all antiseptics.

So, the correct answer is 'Dilute'.

Dettol and savlon is also an

  1. Disinfectant

  2. Antibiotic

  3. Antiseptic

  4. All of the above


Correct Option: C
Explanation:
These are mild chemical substances which, when applied on the body, kill germs. These substances are in such mild concentration that they cause no harm to the skin and body. Lysol, carbolic acid (phenol), Iodine, benzoic acid, Mercurochrome, boric acid etc in dilute solution are good antiseptics. Certain antibiotic creams also serve the same purpose. Dettol, savlon are all antiseptics.
So, the correct answer is 'Antiseptic'.

Select the appropriate statement regarding disinfectants.

  1. They never cause harm to the skin any body

  2. They may cause harm to the skin and body

  3. They are never applied on spots

  4. all


Correct Option: C
Explanation:

These are strong chemical substances that are applied on spots and places where germs thrive an multiply and places where germs thrive and multiply.commonly used disinfectants are cresol, phenol, Lysol,40% formalin, lime, Bordeaux mixture, DDT etc. Precaution-all disinfectants are strong and should not come in contact with the human skin. Strong heat and boiling also destroy germs and may be called physical disinfectants.deodorants are neither antiseptics nor disinfectants.they only serve to mask a bad smell.

So, the correct answer is C

40% formalin is used as

  1. Disinfectants

  2. Antibiotics

  3. Antigens

  4. All of the above


Correct Option: A
Explanation:

These are strong chemical substances that are applied on spots and places where germs thrive an multiply and places where germs thrive and multiply.commonly used disinfectants are cresol, phenol, Lysol,40% formalin, lime, Bordeaux mixture, DDT etc. Precaution-all disinfectants are strong and should not come in contact with the human skin. Strong heat and boiling also destroy germs and may be called physical disinfectants.deodorants are neither antiseptics nor disinfectants.they only serve to mask a bad smell.

So, the correct answer is 'Disinfectants'.

Mark the correct statement about disinfectants

  1. All disinfectants are strong and should not come in contact with the human skin.

  2. Deodorants are neither antiseptics nor disinfectants.

  3. Disinfectants are applied on spots and places where germs thrive an multiply .

  4. All of the above


Correct Option: D
Explanation:

These are strong chemical substances that are applied on spots and places where germs thrive an multiply and places where germs thrive and multiply.commonly used disinfactants  are cresol,phenol,Lysol,40% formalin,lime,Bordeaux mixture,DDT etc. Precaution-all disinfectants are strong and should not come in contact with the human skin. Strong heat and boiling also destroy germs and may be called physical disinfectants.deodorants are neither antiseptics nor is infectants.they only serve to mask a bad smell. 

So,the correct answer is D

Identify the correct definition of a disinfectant.

  1. Chemicals that kill or prevent infection and damage living tissues.

  2. Chemicals that kill or prevent infection without damaging living tissues.

  3. Chemicals that can only kill or prevent infection on non-living objects.

  4. Chemicals that can only kill or prevent infection on animals.


Correct Option: C
Explanation:

Disinfectants are chemical antimicrobial agents used to kill microbes from inanimate objects and surfaces or non-living objects e.g., phenol, cresol etc.

Mark the correct difference between antiseptic and disinfectant

  1. antiseptic are applied on the body whereas disinfectant are applied on spots

  2. antiseptic and disinfectant both are applied on spots

  3. antiseptic and disinfectant both are applied on body

  4. disinfectant are applied on the body whereas antiseptic are applied on spots


Correct Option: A
Explanation:

These are strong chemical substances that are applied on spots and places where germs thrive an multiply and places where germs thrive and multiply.commonly used disinfectants are cresol, phenol, Lysol,40% formalin, lime, Bordeaux mixture, DDT etc. Precaution-all disinfectants are strong and should not come in contact with the human skin. Strong heat and boiling also destroy germs and may be called physical disinfectants.deodorants are neither antiseptics nor is infectants. They only serve to mask a bad smell.
So, the correct answer is A

Identify the correct definition of an antiseptic.

  1. Chemicals that kill or prevent infection and damage living tissues.

  2. Chemicals that kill or prevent infection without damaging living tissues.

  3. Chemicals that can only kill or prevent infection on non-living tissues.

  4. Chemicals that can only kill or prevent infection on animal housing.


Correct Option: B
Explanation:

Antiseptics are the mild chemical and antimicrobial agents applied to living tissues to prevent infection without damaging living tissues e.g., hydrogen peroxide.

Mark the correct statement

  1. Antiseptic are strong germ killing substances

  2. Iodine is an disinfectants

  3. Phenol is a disinfectant

  4. Disinfectant are applied on the body whereas antiseptic are applied on spots


Correct Option: C
Explanation:

These are strong chemical substances that are applied on spots and places where germs thrive an multiply and places where germs thrive and multiply.commonly used disinfectants are cresol,phenol,Lysol,40% formalin,lime,Bordeaux mixture, DDT etc. Precaution-all disinfectants are strong and should not come in contact with the human skin. Strong heat and boiling also destroy germs and may be called physical disinfectants.deodorants are neither antiseptics nor disinfectants.they only serve to mask a bad smell.

So, the correct answer is 'Phenol is a disinfectant'.

A person applies hydrogen peroxide on his wound. This is to kill

  1. Anaerobic bacteria

  2. Aerobic bacteria

  3. Fungi

  4. Protozoa


Correct Option: A
Explanation:

A person applies hydrogen peroxide on his wound. This is to kill anaerobic bacteria. Anaerobic bacteria cannot survive in the presence of oxygen. The hydrogen peroxide bubbling releases oxygen. Hence, due to the released oxygen, anaerobic bacteria will be killed. However, it also affects the healthy cells of the body. This in turn slows down the process of wound healing.

Thus, the correct answer is 'Anaerobic bacteria.'

Hexachlorophene is a bactericide often used in

  1. Medicines

  2. Antibiotics

  3. Disinfectants and soaps

  4. Preservatives


Correct Option: C

Antiseptics are

  1. hormones

  2. enzymes

  3. chemical substances

  4. all


Correct Option: C
Explanation:

These are mild chemical substances which, when applied on the body, kill germs. These substances are in such mild concentration that they cause no harm to the skin and body. Lysol, carbolic acid (phenol), Iodine, benzoic acid, Mercurochrome, boric acid etc in dilute solution are good antiseptics. Certain antibiotic creams also serve the same purpose.

Ozone is passed through swimming pool because it

  1. Absorbs UV radiations

  2. Acts as disinfectant

  3. Easily available from $O _2$

  4. All of the above


Correct Option: B
Explanation:

Ozone is an effective disinfectant. It is passed through the swimming pool and is used in water treatment units because of the following reasons:

1. It improves the smell and visibility of the water.
2. It destroys bacteria and viruses by causing their oxidation.
3. It oxidises metals like manganese, iron and sulphur into the soluble particles and so these can be easily filtered out.
4. It has a bleaching effect on the discoloured water.
Hence, the correct answer is 'Acts as disinfectant'.

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