You Do Need power plug adapter while traveling from Seychelles to Israel.

Here is Why You Need An Adapter

The outlet and plug type used in Israel are C and H and in Seychelles is G. This is how they look like.

Seychelles

In Seychelles, outlets of type G are in use.

Type G

Israel

In Israel, outlets of type C and H are in use.

Type C

Type H