which among them is not the characteristic of turtle ?
1 . they are oviparous 
2 . they are terrestrial
3 . sexes are seperate 
4 . heart is three chambered
 

1. Yes , turtles are oviparous i.e egg laying animals. 
2. Turtles are mostly terrestrial , but are also aquatic as well as both. 
3. Sexual dimorphism  present i.e sexes are separate.
4. As it belongs to class reptile it has three chambered heart.

So option. 2 is incorrect. 

Regards.