Developmental Biology — DU B.Sc. (Hons.) Zoology Previous Year Question Papers

5. (a) Describe various types of placenta on a histological basis. 10 6. (b) Add a note on the functions of placenta. 5 Write short notes on atry three of the following : (i) Extraembryonic membranes in chick (ii) Fate Maps (iv) Hormonal disrupters as I teratogens (v) Patterrls of cleavage Your Roll "o. Name. of the Course : DSC : Development Semester mme .. 2 Hours Mardmum Marks : 60 (d) Draw-well labelled diagrams wherever necessary. 1. (a) Define (any four) : (i) Perivitelline space (ii) Bla.sterna (b) Differentiate between the following (any two) : 2x2=4 (i) Subgerminal and segmentation cavity (ii) Preformation and Epigenesi.s (c) Name the germ layers from which each of the following is derived. O.5x6=3 (ii) Adrenal Medulla (iii) Skin (d) Expand the following abbreviations: (e) State the major contributions of the following scientists. t: 1 x2=2 2. (a) Explain in detail the growth of oocyte during oogene.sis. 8 (b) Describe the `role of acrosome reaction during fertilization in mammals. 7 3. (a) Define Metamorphosis. Briefly describe hormonal regulation of metamorphosis in\ (b) Explain the principle and procedure of Amniocentesis. Discuss its significance in the prenatal diagnosis. 7 4. (a) Describe various morphogenetic movements . with reference to gastrulation in frogo 10 (b) Compare the blastopore of frog to primitive streak of chick. 5