CBSE CLASS 9 CHAPTER - Why do we fall ill - Q/A

CBSE MCQ Questions with answers can be used most effectively to measure both simple knowledge and complex concepts. Since multiple-choice questions can be answered quickly, they can assess a students' mastery of many topics in a short period of time.

Correctly structured CBSE MCQ Quiz that offers the greatest academic value will not simply indicate if the student’s answer is right or wrong, it will go further by clearly explaining the reasons why each answer was right or wrong – thus ensuring the all-important continuation of the learning process.

We have also added CBSE NOTES FOR QUICK REVISION , Which help you to focus your attention and avoid distractions. As you read notes, you will be engaging your mind in identifying and organizing the main ideas of topic in minimum time span and make it easy to memorize the topic for best result.

 

Q1: Define cell ?

 

   

Answer:    Cells are the basic units of organisms. Cells are made of a variety of chemical substances–proteins, carbo-hydrates, fats or lipids etc. Cell is a dynamic place .

 

 

Q2: Complex reactions and repair goes on inside cells  ? Is it true or false ?

 

   

Answer: True

 

 

Q3: Are Various specialised activities going inside our body are interconnected?

 

   

Answer: Yes.

 

 

Q4:Food is a necessity for cell and tissue functions. Is it true or false? ?

 

   

Answer: True

 

 

Q5: What do you understand from term health?

 

   

Answer:  Health means a state of physical, mental and social well-being.

 

 

Q6:The health of all organisms will depend on their surroundings or their environment. Is it true ?

 

   

Answer: yes,It is true.

 

 

Q7:  What is meaning of hygiene and sanitation ?

 

   

Answer: Hygiene means purification of environment from micrograms causing diseases. Sanitation refers the steps or measure taken to ensure hygiene.

 

 

Q8:What are 5 hygiene  steps? 

 

   

Answer:  1.   Protect the water source  2.Wash hands before preparing and taking food  3.Cover the food 4.  Clean vegetables and fruits before use 5. Clean vegetables and fruits before use  

 

 

Q9: What are 5 sanitation steps ?

 

   

Answer: 1.Treat and store water safely 2. Wash hands after defecation. 3. Control flies. 4. Avoid open defecation  5. Treatment of water    

 

 

Q10:  Each of the organ systems has specific organs as its parts, and it has particular functions. Is it true or false?

 

   

Answer:  True

 

 

Q11:The musculoskeletal system, which is made up of bones and muscles Is it true or false?

 

   

Answer: true .

 

 

Q12: What is symptoms of disease ?

 

   

Answer: Symptoms just indicate that there is a disease. They do not indicate the exact type of disease. 

 

 

Q13:   What is acute disease ?

 

   

Answer: Acute diseases refer to a medical condition that occurs suddenly and lasts for a shorter period of time. 

 

 

Q14:  What is chronic disease ?

 

   

Answer:  Chronic diseases develop slowly and last for a lifetime.  

 

 

Q15:  What causes disease? ?

 

   

Answer: There two main causes for diseases: Immediate cause: The organisms that enter our body and cause the disease are termed as an immediate cause. For example, virus, bacteria, protozoa etc. Contributory cause: The secondary factors which led these organisms enter our body are termed as a contributory cause. For example, dirty water, contaminated food, improper nourishment, poor standard of living, etc.

 

 

Q16:  What is pathogen ?

 

   

Answer:  Pathogens are external agents that cause diseases in other organisms. This pathogen includes harmful microbes or microorganism such as bacteria, virus, fungi or protozoa.

 

 

Q17:  What is parasites?

 

   

Answer:  A parasite is an organism that lives in another organism, called the host, and often harms it. It is dependent on its host for survival – it has to be in the host to live, grow and multiply.

 

 

Q18:  What is virus?

 

   

Answer: A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism.It is not a cell.

 

 

Q19: Protozoans are single-celled animals .Is it true?

 

   

Answer: true

 

 

Q20: What are diseases caused vy viruses ?

 

   

Answer: Common examples of diseases caused by viruses are the common cold, influenza, dengue fever and AIDS