21.

Which of the following represents the correct combination without any exception?

• Characteristic	Class
  Mammary gland; hair on body; pinnae; two pairs of Limbs	Mammalia

• Characteristic	Class
  Mouth ventral, gills without operculum; skin with placoid scales; persistent notochord	Chondricht hyes

• Characteristic	Class
  Sucking and circular mouth; jaws absent, integument without scales; paired appendages	Cyclostomata

• Characteristic	Class
  Sucking and circular mouth; jaws absent, integument without scales; paired appendages	Cyclostomata

Capacitation refers to changes in the 

• Sperm before fertilization

• Ovum before fertilization

• Ovum after fertilization

• Ovum after fertilization

Which of these is not an important component of initiation of parturition in humans?

• Increase in oestrogen and progesterone ratio

• Synthesis of prostaglandins

• Release of oxytocin

• Release of oxytocin

Which of the following cells during gametogenesis is normally dipoid?

• Primary polar body

• Spermatid

• Spermatogonia

• Spermatogonia

If for some reason, the vasa efferentia in the human reproductive system get blocked, the gametes will not be transported from

• epididymis to vas deferens

• ovary to uterus

• vagina to uterus

• vagina to uterus

The testes in humans are situated outside the abdominal cavity inside a pouch called scrotum. The purpose served is for

• escaping any possible compression by the visceral organs

• providing more space for the growth of epididymis

• Providing a secondary sexual feature for exhibiting the male sex

• Providing a secondary sexual feature for exhibiting the male sex

he figures given below depicts a diagrammatic sectional view of the female reproductive system of humans. Which one set of three parts out of A-F have been correctly identified.

• C- Infundibulum, D -Fimbriae, E -cervix

• D- oviducal funnel, E Uterus, F- cervix

• A - Perimetrium, B - Myometrium, C -Fallopian tube

• A - Perimetrium, B - Myometrium, C -Fallopian tube

Ureters act as urogenital ducts in

• humans males

• human females

• frog's both males and females

• frog's both males and females

In vitro fertilisation is a technique that involves the transfer of which one of the followings into the Fallopian tube?

• Embryo only, up to 8 cells stage

• Either zygote or early embryo up to 8 cell stage

• Embryo of 32 cells stage

• Embryo of 32 cells stage

Sertoli cells are found in

• Ovaries and secrete progesterone

• adrenal cortex and secrete adrenalin

• seminiferous tubules and provide nutrition to germ cells

• seminiferous tubules and provide nutrition to germ cells