The BVD stands for Back Vertex Distance, this is a measurement that is included on any prescription where the sphere or cylinder powers are higher than + or - 5.00D and to a lesser extent some prescriptions where it is less than this power.
Winged Drone | Alate | Male Ant. Drones are the only male ants in a colony. They are born from un-fertilized eggs. Drones are not like typical ants. They donât do any work in their nests, and they look more like wasps than ants. They are reproductive winged ants and so are alates.
1 Answer. 0 votes. answered by Shubham bhagat. The male and female gamete producing organs are called primary sex organs. In male primary sex organ is TESTIS which is present in scrotum, it is a pair gland each present in each scrotal lobe.it produces male gamete called sperm. Answer. 0 votes. answered by Shubham bhagat. The male and female gamete producing organs are called primary sex organs. In male primary sex organ is TESTIS which is present in scrotum, it is a pair gland each present in each scrotal lobe.