Diseases Cause and Control Long Answer Biology Class-9 ICSE Selina Publishers
Diseases Cause and Control Long Answer Biology Class-9 ICSE Selina Publishers Solutions Chapter-16. Step By Step ICSE Selina Concise Solutions of Chapter-16 Diseases Cause and Control with Exercise-16 including MCQs, Very Short Answer Type, Short Answer Type, Long Answer Type and Structured/Application Questions Solved . Visit official Website CISCE for detail information about ICSE Board Class-9.
Diseases Cause and Control Exe-16 Long Answer Biology Class-9 ICSE Concise Selina Publishers
|Chapter-16||Diseases Cause and Control|
|Topics||Solution of D. Long Answer Type|
D. Long Answer Type
Diseases Cause and Control Class-9 Biology Concise Solutions
Write very briefly about the following:
(b) Incubation period
(c) Chicken pox
(d) Hepatitis A
It is a vaccine which is effective against the bacterial disease tuberculosis (TB). It develops immunity to TB. BCG stands for Bacillus Calmette Guerin.
(b) Incubation period:
It is the period between the entry of germs and the appearance of the first symptoms of the disease. Example: Incubation period of pneumonia is 1-3 days.
(c) Chicken pox:
It is a viral disease caused by the Herpes Varicella zoster virus. It spreads rapidly by close contact with an infected person. A live attenuated vaccine containing Varicella is administered to children of 12-18 months for active immunisation.
(d) Hepatitis A:
Hepatitis A is a viral disease caused by Hepatitis A virus which results in inflammation of the liver. It has an incubation period of 14-45 days. This is mainly transmitted through contaminated food and water.
What are the causes and symptoms of malaria, chicken pox and tuberculosis? How can these diseases be prevented?
|Chills, high fever, profuse sweating, severe headache, nausea, vomiting, fatigue and body pain||Destruction of mosquitoes at all
and avoid mosquito bites by
using mosquito nets or repellents
|Highly irritating rashes near the chest and back, gradually spreading to the arms, legs, face and head||Active immunisation by administering live attenuated vaccine containing Varicella|
|Persistent cough, afternoon fever, bloody mucus, loss of weight, fatigue and
|BCG vaccination and
of the patient
What are the different ways in which infectious diseases can spread?
The different ways in which infectious diseases can spread are as follows:
(i) Direct contact: Person to person, animal to person and expected mother to child.
(ii) Indirect contact: Doorknob, phone, etc.
(iii) Droplet transmission: Sneezing, Coughing, etc.
(iv) Particle transmission: Air particles can transfer infectious diseases
(v) Bites and Stings: Mosquitoes, lice, ticks, etc.
(vi) Food Contamination: Food, beverages, etc.
Name any four non-infectious diseases and their causes.
|Non-infectious Diseases||Cause of the Disease|
|Cancer||Carcinogens like chemicals, tobacco smoking, pollution, etc.|
(a) Pandemic and Sporadic diseases
(b) Communicable and non-communicable diseases
(c) Allergens and carcinogens
(d) Endemic and Epidemic diseases
(e) Pathogen and Vector
(a) Difference between pandemic and sporadic diseases :
|Pandemic diseases||Sporadic diseases|
|A pandemic disease is an outbreak of a disease that occurs over a wide geographic area and affects an exceptionally high proportion of the population.||Sporadic diseases are characterized by the occurrence of isolated individual cases or occasional outbreaks of a disease.|
|Example: AIDS, COVID-19||Example: Malaria, Cholera|
(b) Difference between communicable and non-communicable diseases :
|Communicable diseases||Non-communicable diseases|
|They are transmitted from infected person to healthy person.||They are non-transmissible|
|They are caused by germs||They are not caused by germs|
|Example: Cholera, Malaria.||Example: Diabetes, beri-beri.|
(c) Difference between allergens and carcinogens :
|Any agent that causes allergy is called an allergen.||Any agent that causes cancer is called a carcinogen.|
|Allergens cause the immune system to overreact producing an allergic response.||Carcinogens cause cancer by damaging DNA or interfering with cellular processes, leading to uncontrolled cell growth and the formation of tumors.|
|Example: Dust, Smoke, Pollen||Example: Tobacco, Radiations, Pollutants|
(d) Difference between endemic and epidemic diseases :
|Endemic diseases||Epidemic diseases|
|An endemic disease is found in a certain area only attacking a fewer number of people.||An epidemic disease breaks out and spreads from place to place affecting large number of people at the same time.|
|Example: Yellow fever in African countries, Goitre in Sub-Himalayan region.||Example: Plague in India in 1994, H1N1 influenza pandemic in 2009.|
(e) Difference between pathogen and vector :
|A pathogen is a microorganism or agent that can cause disease in a host organism.||A vector is an organism or agent that can transmit a pathogen from one host to another.|
|Pathogen are generally bacteria, virus, protozoa etc.||Vector are generally mosquitoes, flies, rats, etc.|
|Example: Plasmodium, Mycobacterium tuberculosis||Example: Aedes mosquito, Tsetse fly, Rats.|
Write five important preventive measures advised by WHO to minimise the chances of getting COVID-19.
Five important preventive measures advised by WHO to minimise the chances of getting COVID-19 are:
(i) Staying at home.
(ii) Regularly washing hands with soap and water.
(iii) Avoiding crowded spaces.
(iv) Wearing a mask in public and maintaining a safe distance.
(v) Getting vaccinated.
— : End of Diseases Cause and Control D. Long Answer Class-9 ICSE Biology Solutions :–
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