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
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.
Assertion : Peptic ulcers cause acidity related pain and bleeding in the stomach.
Reason : Stress in the life causes peptic ulcers.
Assertion : The type of treatment to be followed is same for all types of pathogens.
Reason : Immunisation can prevent many infectious diseases.
Assertion : Chloroquine kills the malarial parasite in human body.
Reason : Quinine is extracted from the bark of Cinchona tree.
Assertion : Tuberculosis is a bacterial disease.
Reason : Tuberculosis is mainly transmitted by droplet infection.
Assertion : Diseases that last for only very short period of time are called acute diseases.
Reason : Typhoid is an acute disease.
Assertion : Antibiotic is given to treat or prevent the bacterial infection.
Reason : Antibiotic stops the growth of bacteria.
Assertion : Communicable diseases are called infectious diseases.
Reason : Cancer is a communicable disease.
Assertion : Vaccination is to grow the production of specific antibodies.
Reason : Antibodies confer immunity against subsequent infection.
Assertion : Influenza spreads faster.
Reason : It is an air-borne disease.
Assertion : A person suffering from AIDS cannot fight even very minor infections.
Reason : Casual organism of AIDS is HIV.
Assertion : Chances of spreading cholera are higher in a village.
Reason : Community health is essential for good individual health.
Assertion : Infectious diseases can be prevented by public health hygiene measures.
Reason : Public health measures reduces exposure to infectious agents.
Assertion : Tuberculosis is an acute disease.
Reason : Disease that lasts for a short period is called acute disease.
Assertion : : Its okay to sit near a person suffering from cold.
Reason : Cold is a non-communicable disease.
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.
Assertion : Hepatitis is a viral infection of liver causing its inflammation.
Reason : Hepatitis is a contagious disease.
Assertion : Microbes that enter the body through nose are more likely to affect the lungs. Reason : Nose directly leads to lungs.
Assertion : In many species of mosquitoes, only the females feed on warm-blooded animals, including humans.
Reason : Female mosquitoes are vectors of many diseases.
Assertion : Dengue can be treated by taking antibiotics.
Reason : Antibiotics block the biochemical life processes of viruses.
Assertion : Cancer is a non-infectious disease
Reason : Cancer impairs normal body activities only for few days.
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.
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.
Assertion : Making anti-viral medicine is harder than making anti-bacterial medicines.
Reason : It takes hundreds of years to prepare antiviral drugs.
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.
Assertion : Malaria is caused due to Plasmodium and kala-azar is caused due to Leishmania.
Reason : They both are protozoans.
Assertion : Elephantiasis is a chronic disease.
Reason : It lasts for a long time and has a long term effect on health.
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.
Assertion : Common cold is an acute disease.
Reason : Common cold spreads through the mucus of the infected people during sneezing and coughing.
Assertion : Harelip is a congenital disease.
Reason : Harelip lasts for only a short time.