Write the procedure involved in the acid and leaf experiment to understand the concept "how the stomach gets protected from its own acid secretions ". Compare the observations with the changes that takes place in human digestive system.

How is the stomach protected from the secretions of its own acids?

How can you prove , show that stomach us protected from damage is being caused be secretion of its own acid ?

What did you observe in acid and leaf experiment ? What did you have understand regarding human digestive system from this?

Complete the blanks. The wall of stomach secrete …………(1) acid. The wall of stomach is protected from it's own acids with the help of ………..(2)

Observe a dog in your surroundings .how does it get its food? Write your observations. Which parts are involved in taking in food?

How do you count the following observations? a) Though alkaline potassium permanganate and acidic potassium permanganate both are used as oxidants, yet in the manufacture of benzoic acid from toluene we use alcoholic potassium permanganate as an oxidant. Why ? Write balanced redox equation for the reaction. b) When concentrated sulphuric acid is added to inorganic mixture containing chloride, we get colourless pungent smelling gas HCl, but if the mixture contains bromide then we get red vapour of bromine. Why ?

Take two similar green leaves . Apply grease on one leaf and leave the other free. Add 1 or 2 drops of acid on each leaf . What kind of change do you observe from this ?