Q.

Which of the following describes the given graph correctly   [2016]

1 Endothermic reaction with energy A in presence of enzyme and B in absence of enzyme.  
2 Exothermic reaction with energy A in presence of enzyme and B in absence of enzyme.  
3 Endothermic reaction with energy A in absence of enzyme and B in presence of enzyme.  
4 Exothermic reaction with energy A in absence of enzyme and B in presence of enzyme.  

Ans.

(2)