51.

Sertoli cells are regulated by the pituitary hormone known as

• FSH

• GH

• Prolactin

• Prolactin

Withdrawal of which of the following hormones is the immediate cause of menstruation?

• Eastrogens

• FSH

• FSH-RH

• FSH-RH

Capacitation occurs in

• Rete testis

• Epididymis

• Vas deferens

• Vas deferens

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.

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

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

The stage during which separation of the paired homologous chromosomes begins is

• Pachytene

• Diplotene

• Zygotene

• Diakinesis

Which of the following statements is correct?

• Ovules are not enclosed by ovary wall in gymnosperms

• Selaginella is heterosporous, while Salvinia is homosporous

• Stems are usually unbranched in both Cycas and Cedrus

• Horsetails are gymnosperms

Gastrula is the embryonic stage in which

• Cleavage occurs

• blastocoel forms

• Germinal layers form

• Villi form

Which type of immunoglobin is/are abundantly found in the foetus?

• IgE

• IgE

• IgM

• IgD