Notes | EduRev

Science Class 9

Created by: Dr Manju Sen

Class 9 : Notes | EduRev

The document Notes | EduRev is a part of the Class 9 Course Science Class 9.
All you need of Class 9 at this link: Class 9

SHORT ANSWER TYPE QUESTIONS

Q.1. (i) Write the definition of health as given by WHO.
(ii) List two factors that affect health.    [CBSE 2017]

Ans: (i) WHO stands for World Health Organisation. According to WHO, “Health refer; to state of complete physical, mental and social well-being.”
(ii) Factors affecting health are :
(а) Malnutrition
(b) Infection
(c) Emotional disturbance

Q.2. Name the two types of diseases one caused by some external agents and other due to some internal disorder of the body. Mention any two causative agents.    [CBSE 2017]
Ans: Disease caused by :
(i) External agent - Malaria, Tuberculosis etc.
(ii) Internal disorder - High blood pressure, cancer, diabetes etc.
Causative agents :
(i) Malaria - Plasmodium virax.
(ii) Typhoid - Salmonella typhi.

Q.3. Why do female mosquitoes need highly nutritious food in the form of human blood?    [CBSE 2016]
Ans: Female mosquitoes need highly nutritious food in the form of human blood to be able to lay mature eggs.

Q.4. What is meant by community? How our personal health is related to the community issues? Explain in brief,    [CBSE 2016]
Ans: Community is defined as a group of people who live in a certain locality and interact with one another having a common goal.
Personal health is the state of physical, mental and social well being of an individual. Community health is the maintenance, protection and improvement or overall well being of health of the whole community.
Health of a person depends on his personal habits as well as physical environment. Social equality and harmony in the community are also important to maintain individual’s health. So our social environment is an important factor in our individual health. Therefore our social environment is an important factor in our individual health. Similarly, the health of . the whole community depends on the personal habits of various individuals who constitute the community.

Q.5. Classify the following under fungus/protozoan viral/bacterial diseases:
Tuberculosis, malaria, skin infection, typhoid hepatitis.    [CBSE 2015]
Ans:
 Notes | EduRev

LONG ANSWER TYPE QUESTIONS

Q.1. The immune system of Hari is damaged by the attack of a pathogen on his body.
(i) Name the disease he is suffering from.
(ii) Name the pathogen that has attacked his body.
(iii) Mention any three modes of transmission of this disease. [CBSE 2017]
Ans:
(i) He is suffering from AIDS or Acquired Immuno-Deficiency Syndrome.
(ii) The pathogen is a virus called HIV or Human-Immuno-deficiency virus.
(iii) This virus is transmitted through following ways :
(a) Sexual contact with an infected person carrying AIDS virus.
(b) Transfusion of blood infected with HIV.
(c) Use of unsterilized needles, blades or razors.
(d) Transplacental transmission i.e., AIDS infected mother to the foetus developing in her womb.

Q.2. Complete the table:    [CBSE 2016]
 Notes | EduRev
Ans:
 Notes | EduRev

Q.3. Label the following picture (a) to (b) to show the common mode of disease transmission.   [CBSE 2015]
 Notes | EduRev
Ans:
(a) Direct contact
(b) By air
(c) Indirect contact
(d) By food
(e) Mosquito/insect
(f) Rabid animal

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