STD 12 - 8. microbes in human welfare — BIOLOGY STD 12 Science — Question

$I$. Pills prevent ovulation during use as contraception technique

$II$. Copper$-T$ prevents implantation

$III$. Vasectomy produces semen containing no sperm

$(1)$ The process of fusion of a sperm with an ovum is called fertilisation

$(2)$ $LH$ surge induces rupture of graffian follicle

$(3)$ $8$ cells embryo is called morula

$(4)$ Length of fallopian tube is $8-10 \,cm$