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Which of the following organ is formed during gastrulation? • (a) Gill • (b) Vitelline membrane • (c) Heart • (d) Archenteron • Answer: (d) • 2. Mesoderm gives rise to all the structures except ______. • (a) Gonads • (b) Circulatory system • (c) Nervous system • (d) Muscular system • Answer: (c) • 3. In human females, the fertilized eggs get implanted in the uterus after ________. • (a) One month of fertilization • (b) Two months of fertilization • (c) Seven days of fertilization • (d) Three weeks of fertilization • Answer: (c) • 4. Brain, nerve cells and spinal cord or the central nervous system develops from embryonic ______. • (a) Mesoderm • (b) Endoderm • (c) Ectoderm • (d) Both (b) and (c) • Answer: (c) • 5. Which of the following options contains only the mesodermal structures? • (a) Heart, blood, bones, notochord • (b) Heart, blood, muscles, liver • (c) Notochord, blood, liver, muscles • (d) Liver, heart, bones, blood • Answer: (a) • 6. Implantation is the process of__________. • (a) Attachment of blastocyst to the uterine wall • (b) Egg movement • (c) Degeneration of egg • (d) Egg fertilization • Answer: (a) • 7. Which of the following embryo has a parasitic mode of nutrition? • (a) Mammalian embryo • (b) Bird’s embryo • (c) Amphibian embryo • (d) Reptilian embryo • Answer: (a) • 8. which of the following events is likely to take place, if the nuclei from an 8-celled stage of an embryo are transplanted into enucleated eggs? • (a) Recipient egg dies • (b) Donor nuclei die in the new environment • (c) Cleavage occurs but is arrested after some time • (d) Formation of the viable embryo in the recipient eggs • Answer: (d) • 9. Egg implantation is followed by______. • (a) Parturition • (b) Copulation • (c) Fertilization • (d) Gestation • Answer: (d) • 10. Pseudopregnancy is a physiological condition, comparable to normal pregnancy except that there is no__________. • (a) endometrial changes • (b) developing foetus • (c) corpus luteum • (d) developing ovum • Answer: (b) • ‪@ZOOLOGYNOTES‬

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