Statement 1: A solution of sucrose in water is dextrorotatory. But on hydrolysis in the presence of a little hydrochloric acid, it becomes laevorotatory.
Statement 2: Sucrose on hydrolysis gives unequal amounts of glucose and fructose. As a result of this, change in sign of rotation is observed.
 

The hydrolysis of sucrose by boiling with a mineral acid (HCl), produces a mixture of equal molecules of D-glucose and D-fructose. Sucrose solution is dextrorotatory
specific rotation - + 66.5⁰. But on hydrolysis, it becomes  laevorotatory. The specific rotation of D-glucose is + 52^o and of D-fructose is 92^o. Therefore, the net specific rotation of an equimolar mixture of both is: $\frac{+{52}^{\mathrm{o}}-{92}^{\mathrm{o}}}{2}=-{20}^{\mathrm{o}}$