Why do we fall ill.

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