CBSE Class 9 Biology Why Do We Fall Ill Worksheet Set A

Read and download free pdf of CBSE Class 9 Biology Why Do We Fall Ill Worksheet Set A. Students and teachers of Class 9 Biology can get free printable Worksheets for Class 9 Biology in PDF format prepared as per the latest syllabus and examination pattern in your schools. Standard 9 students should practice questions and answers given here for Biology in Grade 9 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 9 Biology Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems provided here with solutions on daily basis to get more score in school exams and tests

Why Do We Fall Ill Class 9 Biology Worksheet Pdf

Class 9 Biology students should refer to the following printable worksheet in Pdf for Why Do We Fall Ill in standard 9. This test paper with questions and answers for Grade 9 Biology will be very useful for exams and help you to score good marks

Class 9 Biology Worksheet for Why Do We Fall Ill


CBSE Class 9 Biology Worksheet - Why do we fall ill

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why do we fall ill
Question 1: State any two conditions essential for good health.
Answer- (1) Better sanitation or clean surroundings
(2) Mental ,social and physical well being.
Question 2: State any two conditions essential for being free of disease.
Answer- (1) To be free from any specific disease.
(2) Get vaccination against infectious disease whenever required.
Question 3: Are the answers to the above questions necessarily the same or different? Why?
Answer-The answers to the above questions are different because a person may be free of disease but not be
good mentally, socially, and economically
Question 4: List any three reasons why you would think that you are sick and ought to see a doctor. If only one of these symptoms were present, would you still go to the doctor? Why or why not?
Answer (i) having high body temperature ; (ii) having diarrhoea (loose motions), and ; (iii) having
If only one symptom persists, then also one should go to a doctor. The doctor will diagnose on the basis
of the symptoms. Doctor will also get laboratory tests done to pin point the disease further.
Question 5: In which of the following case do you think the long-term effects on your health are likely to be most unpleasant?
• if you get jaundice,
• if you get lice,
• if you get acne. Why?
Answer- Jaundice causes a long term effect on our health. This chronic disease lasts for a long period of time.Jaundice develops slowly and does not spread rapidly.
Question 6: Why are we normally advised to take bland and nourishing food when we are sick?
Answer- Bland food is soft and can be easily digested and assimilated in body. Nourishing food increases resistance for disease and is essential for repair and growth of body tissue.
Question 7: What are the different means by which infectious diseases are spread?
Answer- Infectious diseases are generally spread through air, water, sexual contact, vectors, physical contact with affected person and through articles of use of affected person.
Question 8: What precautions can you take in your school to reduce the incidence of infectious diseases?
Answer- (a). Trying to stay away from students who are infected.
(b). Covering mouth and nose while coughing and sneezing
(c). Keeping the school environment clean.
(d). Consuming safe clean water.
Question 9: What is immunization?
Answer- The method to boost our immune system with the help of vaccines that help the body to fight against
infectious diseases is called immunization
Question 10: What are the immunization programs available at the nearest health center in your locality? Which of these diseases are the major health problems in your area?
Answer- The immunization programs available at the nearest health centers are Measles, Mumps, and Rubella (MMR), polio vaccine, jaundice, Diphtheria, Pertussis, and Tetanus (DPT), typhoid and hepatitis B.From above typhoid and jaundice create major health problems.


Exam Questions NCERT Class 9 Science Chapter 13 Why do we fall ill

Question. Name the causal organism of AIDS. Why a person suffering from AIDS cannot fight even very minor infections?
Ans : HIV is the causal organism of AIDS. This virus goes to the human immune system, thus can damage the bodily function. So, the body can no longer fight off even very minor infections.

Question. What is an antibiotic?
Ans : A substance which stops the growth of bacteria or kills the bacteria is called antibiotic. Antibiotic is given to treat or prevent bacterial infection.

Question. How do we know that someone is suffering from disease?
Ans : Signs and symptoms indicate presence of a particular disease. Because when there is a disease, either the functioning or the appearance of one or more systems of the body will change for the worse.

Question. What are vectors for a disease?
Ans : Some animals work as vehicles to transfer infection from one person to another. Such animals are called vectors.

Question. Which animal plays the role of vector for rabies?
Ans : Dogs, cats, mongoose, monkey.

Question. What do you understand by symptoms?
Ans : Apparent signs which give a clue about an underlying disease are called symptoms. For example : Headache, fever, abdominal cramps, etc.

Question. You have suffered from chickenpox, when you were in class three. Why will you not suffer from it again?
Ans : As I suffered from chickenpox, when I were in class three. I got well by cure. Now, my immune system has developed antibodies against it.

Question. Common cold spreads faster and is difficult to control. Give reason.
Ans : Common cold is a communicable and air borne disease, i.e., the microbes spread through the air. Thus, common cold spreads faster and is difficult to control.

Question. What is disease?
Ans : Anything which interferes with the normal functioning of the body and impairs the health. 38. What is Incubation Period? Ans : It is the period between the infection and the appearance of the first symptom.

Question. Which was the first Antibiotic?
Ans : Penicillin was the first antibiotic which was invented by Alaxander Flamming in 1928.

Question. A child goes to a party and come back with cough, running nose, headache and fever. What could be the possible disease? Name the pathogen causing it.
Ans : It could be influenza caused by the virus.
Question. Why is Vaccination of children necessary?
Ans : Children are more vulnerable and susceptible to diseases and are hence given vaccines so they are able to develop immunity against diseases.

Question. (i) Why a person suffering from AIDS cannot fight even small infections?
(ii) In a slum area, many people are suffering from malaria. Mention any two unhygienic conditions that must be prevailing in that locality.
(iii) Why female Anopheles mosquito feeds on human blood?
Ans : (i) AIDS is caused by HIV which damages the immune system of the person suffering from it. Thus, the person cannot fight even small infections.
(ii) Stagnant water in the surroundings and accumulation of garbage.
(iii) Because Female Anopheles mosquitoes require large amount of proteins to lay their eggs.

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