The burning of natural gas is oxidation as well as an endothermic reaction.

What type of chemical reaction is respiration? 

What does one mean by exothermic and endothermic reactions? Give examples. 

A solution of a substance "X" is used for whitewashing.

(a) Name the substance "X"

(b) Write the formula of substance "X"

(c) Write the reaction of substance "X" with water

From where do plants get each of the raw materials required for photosynthesis?

What is photosynthesis? Write any three factors that affect photosynthesis.

The reaction of water with $\mathrm{CaO}$ has been shown in the given diagram. 

(a) Write the names of $\left[1\right]$ and $\left[2\right]$. 

(b) Write the name of the reaction taking place.

(c) Write the balanced equation for the reaction taking place.

Differentiate between the following pairs on the basis of what is indicated in the brackets.

 Leaf and Liver [form in which glucose is stored].