Column-I | Column-II | ||
a. | Milk | (i) | Spermatids are transformed into spermatozoa |
b. | Primary spermatocyte | (ii) | Stored in the cavity of alveoli |
c. | Spermiogenesis | (iii) | First menstruation begins at puberty |
d. | Menarche | (iv) | Periodically undergo meiosis |
(a) | Spermatogonia produce sperm cells by spermatogenesis that begins at puberty. |
(b) | All spermatogonia periodically undergo meiosis. |
(c) | A primary spermatocyte completes first meiotic division during embryonic development. |
(d) | The secondary spermatocytes have only 23 chromosomes each. |