4. Into what cavity does the blastopore open? The gastrular slit? What becomes of each? 5. Explain the eccentric position of the early frog blastocoel. 6. Explain the changes in size and position of the frog blastocoel during gastrulation.

Which among these insects secrete seducin by the male which both attracts andpacifies the untamed female so that a connection is established?A. Bombus lapidaries.B. Periplaneta Americana.C. Eciton burchellii.D. Nauphota cinerae. How would you classify the type of ovariole of the following orders Neuroptera,Lepidoptera, some Coleoptera, Diptera andHymenoptera?A. polytrophic type of ovarioleB. telotrophic type of ovarioleC. panoistic type of ovarioleD. both B and C Which part of the egg is closely associated to the chorion?A. yolk deutoplasmB. vitelline membraneC. nuclear cytoplasmD. periplasm What is the major control centers of oogenesis that secretes ecdysone?A. headB. fat bodiesC. ovariesD. corpora allata

1. Which of the following layers protect the mammalian oocyte during ovulation? * a. cortical and hyaline layers. b. vitelline envelope and jelly coat. c. granulosa cells and zona radiata. d. corona radiata and zona pellucida. 2. After ovulation, the following cells are transformed to lutein cells EXCEPT *a. theca cells.b. corona radiata cells.c. cumulus oophorus cells.d. stratum granulosum cells. 3. Which of the following justifies the expansion of the allantois in shelled amniotes? * a. It stores excretory wastes of the embryo. b. It can be accommodated by the coelom c. It forms allantoic vessels for gas exchange. d. It protects the embryo from mechanical stress.

20. The structure that attaches the mammalian embryo to the placenta is a. hypothalamus. b. umbilical cord. C. corpus luteum. d. chorion. 21. In which part of the human reproductive system does the development of an embryo normally occur? a. uterus b. ovary C. scrotum d. testes