The amnion of mammalian embryo is derived from

Both corpus luteum and macula lutea are

Which of the following is an embryonic connective tissue

The stroma of the ovary consists of nerves, blood vessels, muscle fibres and a type of protein called

$I. $ Sperm cells immediately when they are released from the body and are placed in a petri plate remain alive for much longer duration.

$II.$ Semen contains chemicals that causes females smooth muscles to contract

If the ectoderm from neural tissue area is removed from the embryo and transplanted in place of presumptive belly ectoderm embryo will develop