For the following questions answer them individually
Match the items given in Column I with those in Column II and select the correct option given below :

Match the items given in Column I with those in Column II and select the correct option given below :

Hormones secreted by the placenta to maintain pregnancy are
The contraceptive ‘SAHELI?
The difference between spermiogenesis and spermiation is
The amnion of mammalian embryo is derived from
Which of thefollowing animals does not undergo metamorphosis ?
Which one of these animals is mot a homeotherm ?
Which of the following features is used to identify a male cockroach from a female cockroach ?
Which of the following organisms are known as chief producers in the oceans ?