Assertion : During fertilization only head of spermatozoa enters egg.

Reason : If several spermatozoa hit the egg at same time, all can enter the egg.

It is structural and functional unit between developing embryo (Foetus) and maternal body

After one month of pregnancy, the embryo's $…A….$ is formed. By the end of the $…..B…$ month of pregnancy, the foetus develops limbs and digits. By the end of $\ldots$… most of the major organ systems are formed for example, the limbs and external genital organs are well-developed. By the end of $…D….$ the body is covered with fine hair, eyelids separate, and eyelashes are formed. Here$ A$ and $D$ refers to

During pregnancy which of the following is secreted through urine of mother

Which of the following hormones is not a secretory product of human placenta?