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CBSE Questions for Class 9 Biology Why Do We Fall Ill Quiz 3 - MCQExams.com
CBSE
Class 9 Biology
Why Do We Fall Ill
Quiz 3
Deliberately injecting weak microbes into a healthy body and producing antibodies to fight against strong microbes is called
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Medication
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Antibiotics
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Vaccination
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All of the above
Explanation
Vaccination involves an injection of dead or weak microbes in a healthy body to invoke an immune response in these individuals so that memory cells are formed which prepare the body for any further encounters with the same microbe. The second response is so strong that in most cases the disease does not occur.
Medications are drugs used for treating a symptom or disease.
Antibiotics are drugs against common pathogenic diseases like bacteria diseases.
So, the correct answer is 'Vaccination'.
Reducing the effect of the disease involves:
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Use of medicine to reduce fever or pain
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Complete rest to conserve energy
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Use a remedy that will kill the cause of disease
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All of the above
Explanation
Depending on the symptoms of the disease, the medicine will reduce fever and pain. And resting will conserve the energy of the patient. Any remedy that could kill the reason of the disease will help to reduce the effect of the disease.
Thus, the correct answer is option D.
To kill the cause of the disease caused by virus ______ are effective.
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Antibiotics
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Antibacterial drugs
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Antiviral drugs
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Antiprotozoal drugs
Explanation
For complete recovery, it is essential that medicine specific to disease-causing microbes is taken. A virus needs to be treated using antiviral drugs, antibiotics and antiprotozoal will have no effect on the virus. Therefore, (c) is the correct answer.
In your childhood, you must have been given vaccination for ______
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Speeding the growth
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Protection against several diseases
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Protecting the skin
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None of these
Explanation
In childhood, injections are given for protection against several diseases. Those injections are known as vaccines and help to prevent polio, cholera, tuberculosis, smallpox, etc.
Hence the correct option is B.
Infection spread through food can be prevented by__________.
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Thorough cooking of food
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Eating undercooked food
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Use of raw food
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Using packaged food
Explanation
The cooking of food will stop the spread of infection by killing the pathogens. Therefore, (a) is the correct answer.
Which one of the following provides immunity from a particular disease?
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Alcohol
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Vaccine
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Medicine
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All of the above
Explanation
$$\textbf{Correct Option B}$$
$$\textbf{Solution}$$
$$\bullet$$ Alcohol is a toxic and psychoactive substance which is made by the fermentation of grains fruits and sugar. A drug it is not good for our health when consumed in excess amount.
$$\bullet$$
Vaccine is a substance which is the used to stimulate the production of antibodies thereby providing immunity against several diseases.
$$\bullet$$
Medicine is a drug which is required for the treatment and prevention of disease in a non surgical manner.
$$\bullet$$
So the correct options B.
A healthy person is said to be healthy when he is ___________ healthy.
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Physically
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Mentally
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Socially
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All of the above
Explanation
A person is said to be healthy only when he is physically, mentally as well as socially healthy. This is in consensus with the overall definition of health by WHO. WHO defines health as the physical, mental, and social well-being of an individual.
Hence, the correct option is 'D'.
A person is said to be healthy only when he is free from disease.
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True
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False
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Ambiguous
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Data insufficient
Explanation
According to WHO health is a state of complete physical, mental and social well being of a person and not just absence of disease.
Hence the correct option is B.
What is the main difference between communicable and non-communicable diseases?
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Non-communicable diseases can be treated whereas, communicable diseases cannot be treated.
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Communicable diseases can spread to others whereas, non-communicable diseases cannot.
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Communicable diseases can be treated whereas, non-communicable diseases cannot be treated.
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Non-communicable diseases can spread to others whereas, communicable diseases cannot.
Explanation
Communicable diseases are mainly caused by pathogens (infectious) that can pass from one human to another.
Non-communicable disease is a medical condition or disease that is non-infectious or non-transmissible.
Hence, the correct answer is option B.
Which of the following microorganisms causes peptic ulcers?
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Staphylococcus aureus
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Streptococcus pneumonia
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Helicobacter pylori
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Neisseria
Explanation
Helicobacter pylori
are
Gram-negative
bacterium that
live
in the stomach of humans. This bacteria causes ulcers in the cells of the stomach and intestinal tract. The ulcers formed in the stomach are called
peptic ulcers.
Thus the correct answer is option C.
Which of the following causes infectious diseases?
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Pollutants
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Harmful lifestyle
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Inheritance
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Microorganisms
Explanation
Pollutants are the harmful oxides or chemicals which degrade the quality of the environment and causes pollution.
Harmful lifestyle affects the metabolic process of the body and lead to severe diseases and also causes ageing.
Inheritance is the transfer of characters from the parents to offsprings.
Microorganisms are the small microorganism which are not visible to naked eye and are responsible for infectious disease.
So, the correct answer is option D.
Which of the following is not an air-borne disease?
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Common cold
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Malaria
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Pneumonia
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Tuberculosis
Explanation
Malaria is not an air-borne disease. It is transmitted to humans by female
Anopheles
mosquitoes. All the others are air-borne diseases.
So, the correct answer is option B.
Symptomatic treatment needs which of the following procedures?
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Medicine
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Vaccine
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Sugery
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Both A and C
Who among the following is considered to be healthy person.
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Alcoholic
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Drug addict
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Person with typhoid
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None of the above
Explanation
According to WHO health is a state of complete physical, mental and social well being of a person and not just absence of disease. Drugs and alcohol makes a person weaker. Typhoid is a diseases condition.
Hence the correct option is D.
Which of these terms is used to describe a condition that interferes with the normal functioning of the body or mind?
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Vaccination
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Epidemic
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Disease
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Both B and C
Explanation
Disease is a condition that affects the normal functioning of body or mind of an individual. It affects one or more of the organ systems whose cause may be known or unknown.
Hence, the correct answer is option C.
What is the process of curing infection called?
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Principle of prevention
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Principle of treatment
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Principle of transmission of infection
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None of the above
Peptic ulcers are caused by
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A fungus,
Candida albicans
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A virus, cytomegalovirus
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A parasite,
Trypanosoma brucei
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A bacterium,
Helicobacter pylori
Explanation
A peptic ulcer is a sore that develop in the lining of stomach, esophagus and small intestine. It is mainly caused by bacteria
Heliobacter pylori
. Thus the correct answer is option D.
The first vaccine produced by Edward Jenner, was for protection against which disease?
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Hepatitis
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Influenza
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Chicken pox
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Small pox
Explanation
Edward Jenner discovered the vaccine for smallpox in 1798.
So the correct option is D
Infectious diseases can be prevented by:
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Medicines
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Proper food
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Immunisation
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Exercise
Explanation
Infectious diseases are the ones that involve a pathogen that infects a healthy person.
These diseases are caused by viruses, bacteria fungi, protozoans. To prevent such diseases people are vaccinated and immunised against such organisms. The vaccines contain a live-attenuated or dead organism that provides immunity to the body by making memory antibodies.
So, the correct option is 'Immunisation.'
Antibiotics are not effective in
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Fungal infection
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Bacterial infection
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Viral infection
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All of the above
Helicobacter pylori
causes
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Dipnoea
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Peptic ulcers
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Liver cirrhosis
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Bronchitis
Explanation
A peptic ulcer is a sore that develop in the lining of stomach, esophagus and small intestine. It is mainly caused by the bacteria
Heliobacter pylori
. Thus the correct answer is option B.
Antibiotics are not effective in the case of
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Fungal infection.
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Bacterial infection.
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Viral infection.
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All of the above.
The $$2005$$ Nobel Prize in Physiology/Medicine was awarded to Barry Marshall and Robin Warren of Australia for their discovery of
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Human papilloma virus causing cervical cancer.
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Bacterium
Helicobactor pylori
causing peptic ulcer.
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Prions, a new biological principle of infection.
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Human immunodeficiency virus.
Explanation
In 2005, Barry Marshall and Robin Warren of Australia won the Nobel Prize in Physiology/Medicine for their discovery of
Helicobacter pylori
.
Helicobacter pylori
is a Gram-negative bacterium that lives in the stomach of humans. This bacterium causes infection such as ulcers in the cells of the stomach and intestinal tract on excessive growth. The ulcers formed in the stomach are called peptic ulcers. Thus the correct answer is option B.
Diseases are broadly grouped into infection and non-infectious diseases. In the list given below, identify infectious diseases.
I. Cancer
II. Influenza
III. Allergy
IV. Smallpox
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I and II
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II and II
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III and IV
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II and IV
Explanation
Cancer is a genetic and noninfectious disease
Influenza is a viral infection caused by the Influenza virus. It is commonly known as Flu and is a highly contagious disease. It spreads by direct contact, by using the articles used by the infected person, and also by droplets.
Allergies are also non-infectious.
Smallpox is caused by the Variola virus. It is a highly contagious disease with no cure. Smallpox has been eradicated completely owing to the massive vaccination campaigns across countries.
So, the correct answer is, 'Influenza' and 'Small Pox'.
The chemical substances produced by some microbes which can kill or retard the growth of other microbes are called
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Antiviral
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Antacid
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Antibiotic
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All of these
Explanation
Antibiotics are chemical substances secreted by certain microbes which inhibit the growth and development of other microbes.
Some important antibiotics are tetracycline, chloramphenicol, streptomycin, etc.
Water borne disease in the following.
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Cholera
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Tuberculosis
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AIDS
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None of these
Explanation
Cholera is a water borne disease that spreads through contaminated water consumption.
Tuberculosis is an air borne disease.
AIDS is a sexually transmitted disease.
Hence the correct option is A.
Arrange the following in a meaningful sequence.
1) Consultation
2) Illness
3) Doctor
4) Treatment
5) Recovery
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(2), (3), (1), (4), (5)
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(2), (3), (4), (1), (5)
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(4), (3), (1), (2), (5)
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(5), (1), (4), (3), (2)
Explanation
We know that, illness occurs first. Then, patient goes to the doctor and after consultation with him undergoes treatment to finally attain recovery.
Thus, the correct order is (2), (3), (1), (4) and (5).
The disease which last only for a short period of time is called a chronic disease.
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True
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False
Explanation
The disease that lasts for a very short period of time is called acute disease, for example- chickenpox. Chronic diseases last for a very long time.
So, the given statement is 'False'.
Making anti-viral drugs is more difficult than making anti-bacterial medicines because:
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Viruses make use of host machinery
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Viruses are on the border line of living and non-living
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Viruses have very few biochemical mechanisms of their own
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Viruses have a protein coat
Explanation
The basis of antibacterial drugs is that it attacks the biochemical mechanisms of the bacteria cell and either kills it or stops its growth. Example Penicillin that prevents cell wall formation. But in case of viruses such drugs cannot be used as they lack cellular machinery and therefore, utilize the machinery of the host cell to replicate while other metabolic processes are absent in them.
So, the correct answer is '
Viruses make use of host machinery'
Which one of the following is not important for individual health?
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Living in clean space
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Good economic condition
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Social equality and harmony
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Living in a large and well-furnished house
Explanation
Answer:
Living in a well furnished house is regarded an item of luxury or demand but nor need or necessity.
whereas
Living in a a clean space, good economic condition and social equality and harmony is factor responsible for the maintenance of our health.
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