Assertion and Reason Questions for Class 9 Science Chapter 13 Why do we fall ill

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Assertion and Reason Questions for Class 9 Science Chapter 13 Why do we fall ill

Direction: In each of the following questions, a statement of Assertion is given followed by a corresponding statement of Reason. Of the statements, mark the correct answer as
(a) Both assertion and reason are true and reason is the correct explanation of assertion.
(b) Both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Assertion is false but reason is true

Question 1.
Assertion : Some communicable diseases spread by means of droplets.
Reason : The droplets of saliva and naso-pharyngeal secretions may contain millions of bacteria and viruses.

Answer Answer: (a)

Question 2.
Assertion : Peptic ulcers cause acidity related pain and bleeding in the stomach.
Reason : Stress in the life causes peptic ulcers.

Answer Answer: (c)

Question 3.
Assertion : The type of treatment to be followed is same for all types of pathogens.
Reason : Immunisation can prevent many infectious diseases.

Answer Answer: (d)

Question 4.
Assertion : Chloroquine kills the malarial parasite in human body.
Reason : Quinine is extracted from the bark of Cinchona tree.

Answer Answer: (b)

Question 5.
Assertion : Tuberculosis is a bacterial disease.
Reason : Tuberculosis is mainly transmitted by droplet infection.

Answer Answer: (b)

Question 6.
Assertion : Diseases that last for only very short period of time are called acute diseases.
Reason : Typhoid is an acute disease.

Answer Answer: (d)

Question 7.
Assertion : Antibiotic is given to treat or prevent the bacterial infection.
Reason : Antibiotic stops the growth of bacteria.

Answer Answer: (a)

Question 8.
Assertion : Communicable diseases are called infectious diseases.
Reason : Cancer is a communicable disease.

Answer Answer: (c)

Question 9.
Assertion : Vaccination is to grow the production of specific antibodies.
Reason : Antibodies confer immunity against subsequent infection.

Answer Answer: (a)

Question 10.
Assertion : Influenza spreads faster.
Reason : It is an air-borne disease.

Answer Answer: (a)

Question 11.
Assertion : A person suffering from AIDS cannot fight even very minor infections.
Reason : Casual organism of AIDS is HIV.

Answer Answer: (b)

Question 12.
Assertion : Chances of spreading cholera are higher in a village.
Reason : Community health is essential for good individual health.

Answer Answer: (b)

Question 13.
Assertion : Infectious diseases can be prevented by public health hygiene measures.
Reason : Public health measures reduces exposure to infectious agents.

Answer Answer: (a)

Question 14.
Assertion : Tuberculosis is an acute disease.
Reason : Disease that lasts for a short period is called acute disease.

Answer Answer: (d)

Question 15.
Assertion : : Its okay to sit near a person suffering from cold.
Reason : Cold is a non-communicable disease.

Answer Answer: (d)

Question 16.
Assertion : Always wash your hands before and after a meal.
Reason : It is better to prevent a disease than to find a cure for it.

Answer Answer: (a)

Question 17.
Assertion : Hepatitis is a viral infection of liver causing its inflammation.
Reason : Hepatitis is a contagious disease.

Answer Answer: (b)

Question 18.
Assertion : Microbes that enter the body through nose are more likely to affect the lungs. Reason : Nose directly leads to lungs.

Answer Answer: (a)

Question 19.
Assertion : In many species of mosquitoes, only the females feed on warm-blooded animals, including humans.
Reason : Female mosquitoes are vectors of many diseases.

Answer Answer: (b)

Question 20.
Assertion : Dengue can be treated by taking antibiotics.
Reason : Antibiotics block the biochemical life processes of viruses.

Answer Answer: (d)

Question 21.
Assertion : Cancer is a non-infectious disease
Reason : Cancer impairs normal body activities only for few days.

Answer Answer: (c)

Question 22.
Assertion : If the kidneys are not filtering urine, poisonous substances will accumulate.
Reason : Under such conditions, the brain will not be able to think properly. As these activities are interconnected.

Answer Answer: (b)

Question 23.
Assertion : Majority of children in many parts of India are already immune to hepatitis A by the time they are five years old.
Reason : Children are exposed to the virus through water.

Answer Answer: (a)

Question 24.
Assertion : Making anti-viral medicine is harder than making anti-bacterial medicines.
Reason : It takes hundreds of years to prepare antiviral drugs.

Answer Answer: (c)

Question 25.
Assertion : Rabies virus is spread by the bite of infected dogs and other animals.
Reason : There are anti-rabies vaccines for both humans and animals.

Answer Answer: (b)

Question 26.
Assertion : Malaria is caused due to Plasmodium and kala-azar is caused due to Leishmania.
Reason : They both are protozoans.

Answer Answer: (a)

Question 27.
Assertion : Elephantiasis is a chronic disease.
Reason : It lasts for a long time and has a long term effect on health.

Answer Answer: (a)

Question 28.
Assertion : Diseases that are present from birth are called congenital diseases.
Reason : Congenital diseases are caused due to defective development of embryo or defective inheritance.

Answer Answer: (b)

Question 29.
Assertion : Common cold is an acute disease.
Reason : Common cold spreads through the mucus of the infected people during sneezing and coughing.

Answer Answer: (b)

Question 30.
Assertion : Harelip is a congenital disease.
Reason : Harelip lasts for only a short time.

Answer Answer: (c)

2 thoughts on “Assertion and Reason Questions for Class 9 Science Chapter 13 Why do we fall ill

  1. This is very helpful for me and it helps me preparation for final exams

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