Why do we fall ill?

The signs/symptoms of inflammation are...

• Redness

• Heat

• Rash

• Swelling

• Pain

After the recent floods, people faced a lack of access to clean drinking water. They were given water purification tablets to ensure that they consumed clean water. Why was it important to take this step? What can happen if people consume unclean/contaminated water?

Mosquitoes, Dogs, and Fleas are examples of ....

• Scalars

• Vectors

• Animals

If the lungs of a person were affected by a pathogen, what signs/symptoms would you expect the person to have?

What are the examples of barrier immunity?

• White blood cells

• Skin

• Red blood cells

• Mucus

How does mucus function as a barrier and protect us from pathogens?

Prakash says that our white blood cells produce antigens that help fight the pathogens.

Simran says that antigens are on the pathogens and not produced by our white blood cells.

Who do you agree with? Explain your answer.

Ramesh is scared of vaccines because he heard that disease causing pathogens are injected into our body. He is worried he will get a dangerous disease. Do you agree with him? Explain.

Rani is upset that people in her colony are not careful with garbage disposal. The colony's huge garbage cans are overflowing with garbage and there are a lot of mosquitoes and flies hovering around. She says she is more worried about diseases than the stink.

Why is she worried about diseases?

Rohan is very particular about exercising everyday because he knows it will help keep him healthy. His diet is mainly processed foods like biscuits and chips and fast foods like pizzas and burgers. Do you think he can be healthy? Explain.