HEALTH AND DISEASE 9

Practice Paper 

Subject Biology  (2020)

                    CH- 13  Why Do We Fall Ill                              

Class IX.

I. Very Short Answer Type Questions 

1. Who discovered the first vaccine and for which disease?
2. Which are the causative organisms of acne?
3. Why HIV is an incurable disease?
4. Who walked out the principle of immunization?
5. Name the causative organism.
6. Which disease is caused by Helicobacter pylori?
7. Why are signs of disease more important than symptoms?
8. What is the major drawback of the principle of treatment?
9. How do children in many parts of India get immune to Hepatitis- A by the time they are 5 years old.
10. Why do we not use antibiotics against viral disease?
11. Why does the penicillin not effective against the human cell but effective against a bacterial cell?
12. During the HIV infection virus does not kill the person but other diseases killed them could you explain it?
13. Is the primary cause of marasmus? What is the main cause of infectious disease?  

II. Short Answer Type Questions 

1. Influenza or common cold spreads faster and is difficult to control. Why?
2. State the two important ways by which an infectious disease can be treated
3. State two different ways by which infectious diseases spread.
4. What is an antibiotic? Give one example.
5. Name the causal organism of AIDS. Why a person suffering from its, cannot fight even very minor infections?
6. "Community Health" is essential for good individual health. Justify this statement by giving examples.
7. With the help of an example explain how disease-causing microbes spread through the air?
8. Write two examples of each:
   (a) Viral disease   (b) Bacterial disease
9. Which of the following disease will cause major ill effects on General Health- Elephantiasis, Cough and Cold, Tuberculosis, and Diarrhea. What is such a disease called?
10. State any three ways by which an AIDS virus spread from an infected person to a healthy person.
11. AIDS is a fatal disease, explain why?
12. Health workers are exposed to more sick people than others in the community. Write any for preventive measures they take to avoid sickness.
13. How can we prevent waterborne and vector-borne infections?
14. What are the vectors? Give two examples?
15. Chances of spreading of cholera are higher in a village. Give reason.
16. List the name of three diseases caused by viruses stating their mode of communication is in each case.

III. Long Answer Type questions:

1. Although Archana has been suffering from a cold and cough she decided to appear for her class test. Classmates seated close to her hand and exposed to the infection being carried by Archana. However only one of them actually suffered from cold and cough. Explain what prevented the rest of those classmates from catching a cold and cough in spite of their exposure to the infection.
2. What are communicable diseases? Write its one example. How do diseases spread?
3. List for diseases for which vaccines have been developed.
   (a) Name a worm which is found in our large intestine
   (b) Name the bacteria which can cause acne
   (c) Which one is responsible for sleeping sickness
   (d) Which disease is caused by the protozoan leishmania.
4. The immune system of a person is damaged by the attack of the pathogen in his body.
   (a) Name the disease he is suffering from
   (b) Name the pathogen and any to make modes of its transmission.
5. State in tabular form the modes of transmission of each of the following disease:
6. (a) Syphilis   (b) Tuberculosis  (c) Jaundice  (d) Japanese encephalitis.
7. 'Being disease-free is not the same as being healthy' explains the statement gave an example.
8. What causes encephalitis? How does it enter the body? Which organ does it infect? What are the symptoms in this organ is infected?
9. (a) How do children in many parts of India get immune to Hepatitis 'A' by the time they are five years old?
   (b) Pinky suffered from chickenpox last month. Her grandmother told her that now she would not suffer from this disease again. What is the reason for such a saying?
10. What is an immunization? List to disease against which vaccines are available
11. List four preventive measures against communicable diseases.
12. (a) What are the vectors ? (b) In many species of mosquitoes, the male does not prefer human blood, but females do. State why?
13. Write anyone biochemical pathway in bacteria that is blocked by the antibiotics like penicillin.
14. Why is it difficult to make antiviral drugs?
15. Explain how individual health depends on social and mental well-being.
16. List any two ways of preventing the spread of airborne diseases.
17. List any four essential factors that must be taken care of by an individual for keeping good health.
18. Making antiviral medicines is harder than making antibacterial medicine. Justify the statement.
19. Penicillin is not effective against common cold why?
20. Which disease is more harmful: acute or chronic disease? Why are we advised to take bland and nourishing food when we are sick?
21. Write differences between acute and chronic diseases. Pick out chronic disease from the list given below: Japanese Encephalitis, viral fever, common cold, tuberculosis.
22. Write the symptoms when the following organs are targeted by microbes:
    (a) Lungs (b) Liver (c) Brain
23. The same drug does not work against the microbes belonging to different groups. Why? State the mechanism of antibiotics in killing bacteria.
24. (a) State the principle of immunization. Name two diseases from which vaccine is available.
    (b) Mention two basic principles of preventing infectious diseases.
25. State the reasons for the following statements
    (a) Children at the time of birth must be given proper vaccination
    (b) A person suffering from a disease like tuberculosis, flu should be advised to avoid close public contact.
    (c) Personal hygiene is very essential for good health.
26. (a) While going abroad, why is it essential to get vaccinated against certain diseases?
    (b) Name of vaccine which saves the lives of babies from three diseases. 
    (c) A person is suffering from chest pain, breathlessness, loss of body weight, persistent cough and produces blood Stained sputum. Name the disease.
27. Write three precautions you take in your school to reduce the incidence of infectious disease.
28. (a) State the method of transmission of each of the following disease
    (i) Cholera (ii) Malaria (iii) Pneumonia (iv) AIDS. 
    (b) Name the disease a person will get if the disease-causing microbes target the liver of a person.
29. Differentiate between infectious and non-infectious diseases. Give two examples of each.
30. Explain when a disease categorized as a communicable disease. Give two examples for each of disease communicated through (i)  air and (ii) water.
31. (a) If penicillin is given to a person suffering from jaundice, it does not have any effect on the infection. Why?
    (b) Name a disease that has been eradicated from the world 
    (c) State the principle behind its eradication.
32. Antibiotics are successful in curing bacterial infections but do not cure viral infections. Why?
33. A man is suffering from AIDS.
    (i)  He is not able to fight off even minor infections. Why?
    (ii) Write any two ways in which he could have got this disease. (iii) Will the treatment by antibiotics help him with AIDS? Justify your answer.
34. For most microbes, the organ they target is related to their point of entry.
35. (a)  State the principles of treatment that are generally followed by a doctor to treat infectious diseases.
    (b)  Write two ways by which HIV may get transmitted from one person to the other.
36. State the reason for the following statements:
    (a) AIDS is considered to be a syndrome and not a disease.
    (b) Antibiotics are ineffective against viral infections.
    (c) Our surroundings should be free from stagnant water.
37. (a) Which of these is an acute ailment and why? Tuberculosis, Cancer, Diarrhea, Elephantiasis.
     (b) State any two internal non-infectious causes of disease.
    (c) Name the organ that is targeted by the virus that causes jaundice
38. Name two diseases caused by each of the following:
    (a)  Bacteria       (b) Virus         (c) Fungi
39. (a) What is the basis of the principle of immunization?
    (b) Why are the majority of the children in many parts of India already immune to Hepatitis - A though. They have never been vaccinated against it?
40. How infectious diseases spread in a community? Write and give causes of diseases with example
41. Name any five different groups of infectious diseases and give an example of a disease caused by each of them.
42. Explain giving reasons:
    (a) A balanced diet is necessary for maintaining a healthy body.
    (b) The health of an organism depends upon the soundings environmental conditions. (c) Our surroundings area should be free of stagnant water.
    (d) Social harmony and good economic conditions are necessary for good health              

NCERT QUESTIONS:

1. State any two conditions essential for good health.
2. State any two conditions essential for being free of disease.
3. Are the answers to the above questions necessarily the same or different? Why? 
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?
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?  
6. Why are we normally advised to take bland and nourishing food when we are sick?
7. What are the different means by which infectious diseases are spread? 
8. What precautions can you take in your school to reduce the incidence of infectious diseases?
9. What is an immunisation?
10. What are the immunization programs available at the nearest health center is yours.
11. How many times did you fall ill in the last year? What were the illnesses? 
12. (a) Think of one change you could make in your habits in order to avoid any of/most of the above illnesses. 
    (b) Think of one change you would wish for in your surroundings in order to avoid any of/most of the above illnesses.
13. A doctor/nurse/health-worker is exposed to more sick people than others in the community. Find out how she/he avoids getting sick herself/himself. 
14. Conduct a survey in your neighborhood to find out what the three most common diseases are. Suggest three steps that could be taken by your local authorities to bring down the incidence of these diseases.
15. A baby is not able to tell her/his caretakers that she/he is sick. What would help us to find out 
    (a) that the baby is sick? 
    (b) what is the sickness? 
16. Under which of the following conditions is a person most likely to fall sick? (a) when she is recovering from malaria. 
    (b) when she has recovered from malaria and is taking care of someone suffering from chicken-pox. 
    (c) when she is on a four-day fast after recovering from malaria and is taking care of someone suffering from chicken-pox. Why?
17. Under which of the following conditions are you most likely to fall sick? 
    (a) when you are taking examinations. 
    (b) when you have traveled by bus and train for two days. 
    (c) when your friend is suffering from measles. Why?

CHAPTER 1 - MATTER IN OUR SURROUNDINGS	☛ QUESTION WITH SOLUTIONS
CHAPTER 2 - IS MATTER AROUND US PURE?	☛QUESTION WITH SOLUTIONS
CHAPTER 3 - ATOMS AND MOLECULES	☛ QUESTION WITH SOLUTIONS
CHAPTER 4 - STRUCTURE OF ATOM	☛   QUESTION WITH SOLUTIONS
CHAPTER 5 -  THE FUNDAMENTAL UNIT OF LIFE
CHAPTER 6 -  TISSUE
CHAPTER 7 -   DIVERSITY IN LIVING ORGANISM
CHAPTER 8 -  MOTION	☛ QUESTION WITH SOLUTIONS
CHAPTER 9 -  FORCE AND LAW OF MOTION	☛  QUESTION WITH SOLUTIONS
CHAPTER 10 - GRAVITATION	☛ QUESTION WITH SOLUTIONS
CHAPTER 11 -  WORK AND ENERGY
CHAPTER 12 -  SOUND
CHAPTER 13-  WHY DO WE FALL ILL
CHAPTER 14 - NATURAL RESOURCES
CHAPTER 15 - IMPROVEMENT OF FOOD RESOURCES