<prompt> Maximum teratogenic effect on hea of fetus is between?2 - 4 weeks4 - 6 weeks6 - 8 weeks8 - 10 weeks  <response>: Ans. is c i.e.,6 - 8 weeksPeriod of organogenesis Embryonic - 2 - 8 weeks of conception is the time of maximum vulnerability, and each embryonic system has a period of maximum susceptibility.Hea is typically affected if the teratogen acts between 6 - 8 weeks of gestation.CNS maximum susceptibility between 17 - 30th post feilization days. 