Corpus luteum is developed from

Which of the following are secretions produced by the spermatozoa at the time of fertilization?

Which of the following structure originates from ectoderm

The mother germ cells are transformed into a mature follicle through series of steps. Provide the missing steps in the blank boxes.

$\boxed{{\text{Oogonia}}}$ $\to $ $\boxed{\text{A}}$ $\to $ $\boxed{{\text{Primary follicle}}}$ $\to $ $\boxed{\text{B}}$ $\to $$\boxed{\text{C}}$ $\to $ $\boxed{{\text{Mature or Graafian follicle}}}$

Primary sex organs differ from the secondary sex organs in all the following, except

Urinary bladder of the embryo is or Which is the urinary bladder of child placed in the womb