The first germ layer formed in the embryo is

 1.The first germ layer formed in the embryo is
(a) Ectoderm
(b) Endoderm
(c) Mesoderm
(d) Extra embryonal mesoderm
Answer: (b)

2.The cavity contained in graafian follicle is
(a) Antrum
(b) Centrocoel
(c) Blastocoel
(d) Archenteron
Answer: (a)

3.Testis is
(a) Endodermal
(b) Ectodermal
(c) Mesodermal
(d) Extramesodermal
Answer: (c)

4.Testes descend into scrotum in mammals for
(a) Spermatogenesis
(b) Fertilization
(c) Development of sex organs
(d) Development of visceral organs
Answer: (a)

5.Temporary pairing of parents for fusion of gametes is called
(a) Copulation
(b) Conjugation
(c) Communication
(d) Coagulation
Answer: (b)

6.Surgical removal of uterus is
(a) Tubectomy
(b) Hysterctomy
(c) Vasectomy
(d) Orchidectomy
Answer: (b)

7.Sperms remain alive in female genital tract for days
(a) 1
(b) 3
(c) 5
(d) 7
Answer: (a)

8.Sperms produce an enzymatic substance for dissolving egg coverings. It is called
(a) Hyaluronic acid
(b) Hyaluronidase
(c) Androgamone
(d) Diastase
Answer: (b)

9.Sperms are stored and nourished inside
(a) testis
(b) Epididymis
(c) Seminiferous tubules
(d) vasa efferentia
Answer: (b)
10.
Spermiogenesis changes
(a) Spermatogonium to primary spermatocyte
(b) Primary spermatocyte to secondary spermatocyte
(c) Secondary spermatocyte to spermatid
(d) Spermatid to sperm
Answer: (d)

11.Spermatozoa are nourished during their development by
(a) Sertoli cells
(b) Interstitial cells
(c) Connective tissue cells
(d) None of the above
Answer: (a)
12.
Spermatogonia undergo a growth phase to become
(a) spermatozoa
(b) Primary spermatocyte
(c) Secondary spermatocyte
(d) Spermatid
Answer: (a)

13.Spermatogenesis without meiosis occurs in
(a) birds
(b) bees
(c) bat
(d) none of the above
Answer: (b)

14.Sperm of animal species a cannot fertilise ovum of species b because
(a) Fertilizins of a and b are not compatible
(b) Antifertilizins of a and b are not compatible
(c) Fertilizin of a and antifertilizin of b are not compatibel
(d) Antifertilizin of a and fertilizing of b are not compatibel
Answer: (d)

15.Sperm capacitation involves
(a) Change in shape
(b) Release of mitochondria
(c) Removal of membrane fatty acids
(d) Hyaluronic acid
Answer: (c)

16.Smooth muscles lining the wall of scrotum are called
(a) Deltoid muscles
(b) Dartos muscles
(c) Gluteal muscles
(d) Latissimus dorsi muscles
Answer: (b)

17.Site of vitellogenesis is
(a) Secondary oocyte in fallopian tube
(b) Primary occyte in graafian follicle
(c) Primary spermatocyte in testis
(d) Secondary spermatocyte in testis
Answer: (b)

18.Site of fertilization in a mammal is
(a) Ovary
(b) Uterus
(c) Vagina
(d) Fallopian tube
Answer: (d)

19.Sertoli cells occur in
(a) Heart
(b) Liver
(c) Ovary
(d) Seminiferous tubules
Answer: (d)

20.Sertoli cells are found
(a) between the seminiferous tubules
(b) In the germinal epithelium of ovary
(c) In the uppermost part of fallopian tube
(d) in the germinal epithelium of seminiferous tubules
Answer: (d)