2. The primitive streak results from a. lateral epiboly of epiblast cells b. lat

Question

2. The primitive streak results from a. lateral epiboly of epiblast cells b. lateral epiboly of hypoblast cells c. evagination of epiblast cells d. evagination of hypoblast cells 13. In the avian egg cleavage occur in the germinal disk b. embryonic disk d. blastocyst C. Yolk 14. All of the following are derived from the lateral mesoderm EXCEPT a. axial skeleton c. somatic b. heart d. peritoneal linings 15. The human egg is classified as b. holoblastic c e. spiral meroblastic a. telolecithal d. mesolecithal 16. The neural plate a. develops from lateral epiboly endodermal cells. b. results from constriction & elongation of epiblast cells. c. develops similarly in birds and mammals. d. a,b & c 17. In mammals the embryonic mesoderm arises by 1. epiboly of hypoblast toward the primitive streak. 2. epiboly of epiblast toward the primitive streak. 3. ingression of epiblast cells through the primitive 4. evagination from the epiblast laterally a. 1& 2 b. 2& 3 c. 3&4 d. 1,2 &3 e. 1&4 groove. c. blastocoel a. embryonic disk b. trophoblast d. a,b &ce.; b & c 13. In mammals the blastocyst consists of the

Explanation / Answer

12. Correct answer:- ( c) evagination of epiblast cells

Explanation:- The primitive streak originates from the anterior epiblast, and appears as an elongating groove on the dorsal midsagittal surface of the epiblast, along the anterior-posterior axis of the embryo.

13. Correct answer:- (d) blastocyst

Explanation:-  blastocyst ,The first cleavage furrow shows up at the center of the blastodisc.

14. Correct answer:- (d) peritoneal lining

15. Correct answer:- (b) holoblastic

16. Correct answer:- (e) a and b

17. Correct answer:- (b) b and c

18. Correct answer:- (d) a b and c

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