Match the items given in Column I with those in Column II and select the correct option given below :
| column (i) | Column (ii) |
| (a) Proliferative Phase | (i) Breakdown of endometrial lining |
| (b) Secretory Phase | (ii) Follicular Phase |
| (c) Menstruation | (iii) Luteal Phase |
| a | b | c |
| iii | ii | i |
| a | b | c |
| i | iii | ii |
| a | b | c |
| iii | i | ii |
| a | b | c |
| ii | iii | i |
D.
| a | b | c |
| ii | iii | i |
In the proliferative phase, the follicles start developing, hence, called the follicular phase.
Secretory phase is also called as luteal phase mainly controlled by progesterone secreted by corpus luteum. Estrogen further thickens the endometrium maintained by progesterone.
Menstruation occurs due to decline in progesterone level and involves the breakdown of the overgrown endometrial lining.
Hormones secreted by the placenta to maintain pregnancy are
hCG, hPL, progestogens, prolactin
hCG, hPL, estrogens, relaxin, oxytocin
hCG, progestogens, estrogens, glucocorticoids
hCG, hPL, progestogens, estrogens
D.
hCG, hPL, progestogens, estrogens
The placenta is an endocrine gland that is only present during pregnancy. It releases human chorionic gonadotropic hormone (hCG) which stimulates the Corpus luteum during pregnancy to release estrogen and progesterone and also rescues corpus luteum from regression. Human placental lactogen (hPL) is involved in the growth of the body of mother and breast. Progesterone maintains pregnancy, keeps the uterus silent by increasing uterine threshold to contractile stimuli.
The stage during which separation of the paired homologous chromosomes begins is
Pachytene
Diplotene
Zygotene
Diakinesis
B.
Diplotene
Synaptonemal complex disintegrates. Terminalisation begins at diplotene stage i.e. chiasmata start to shift towards end.
The difference between spermiogenesis and spermiation is
In spermiogenesis spermatids are formed, while in spermiation spermatozoa are formed.
In spermiogenesis spermatozoa are formed, while in spermiation spermatids are formed.
In spermiogenesis spermatozoa are formed, while in spermiation spermatozoa are released from sertoli cells into the cavity of seminiferous tubules.
In spermiogenesis spermatozoa from sertoli cells are released into the cavity of seminiferous tubules, while in spermiation spermatozoa are formed.
C.
In spermiogenesis spermatozoa are formed, while in spermiation spermatozoa are released from sertoli cells into the cavity of seminiferous tubules.
Spermiogenesis is conversion of spermatids into spermatozoa whereas spermiation is the release of the sperms from sertoli cells into the lumen of seminiferous tubule.
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