You Do Need power plug adapter while traveling from Guinea to India.

Here is Why You Need An Adapter

The outlet and plug type used in India are C, D and M and in Guinea are C, F and K. This is how they look like.

Guinea

In Guinea, outlets of type C, F and K are in use.

Type C

Type F

Type K

India

In India, outlets of type C, D and M are in use.

Type C

Type D

Type M