e) The beating of citia in the oviduct. d) alle) none 35. Ferodem becomes what? a) Lining of digestive and respiratory tracts; liver pancreas b) Epidermis CNS, sense organs, neural crest e) Skeleton muscles, blood yessels,heart gonads (organ that makes gametes) d) Both a and Part 11. Short answers and discussions (2 marks each) 1. A hollow ball of cells formed when a zygote undergoes a series of divisions is known as a __ 2. What are the endoerine functions of the placenta? 3. What two tissue types form the placenta? 4. What is the function of the yolk sac? (3 marks) 5. Which is the extraembryonic membrane whose function is to store nitrogen wastes of the embryo? 6. What is the cell division process directly related to the embryonic growth? 7. Participation of more than one spermatozoon in fertilization is called __ 8. Extra sperm which succeed in passing through the zona pellucida into the perivitelline space are called __ How the transport of ovum in the oviduct is facilitated? (3 marks) 10. Explain the mechanisms underlying the blocks to polyspermy?

It seems like there are multiple-choice and short answer questions related to biology, specifically embryonic development and reproductive biology. Let's address each question:<br /><br />### Multiple Choice Questions<br /><br />35. **Feroderm becomes what?**<br /> - **a) Lining of digestive and respiratory tracts; liver pancreas**<br /> - **b) Epidermis CNS, sense organs, neural crest**<br /> - **c) Skeleton muscles, blood vessels, heart gonads (organ that makes gametes)**<br /> - **d) Both a and b**<br /><br /> **Answer: d) Both a and b**<br /><br />### Short Answers<br /><br />1. **A hollow ball of cells formed when a zygote undergoes a series of divisions is known as a __**<br /> - **Answer: Blastocyst**<br /><br />2. **What are the endocrine functions of the placenta?**<br /> - **Answer: The placenta produces hormones such as human chorionic gonadotropin (hCG), progesterone, and estrogen, which are essential for maintaining the pregnancy and supporting fetal development.**<br /><br />3. **What two tissue types form the placenta?**<br /> - **Answer: The placenta is formed by the interaction of maternal decidua basalis (endometrial tissue) and fetal chorion (chorionic villi).**<br /><br />4. **What is the function of the yolk sac? (3 marks)**<br /> - **Answer: The yolk sac is involved in early blood cell formation, the formation of the germ cells, and the absorption of nutrients during the early stages of embryonic development.**<br /><br />5. **Which is the extraembryonic membrane whose function is to store nitrogen wastes of the embryo?**<br /> - **Answer: Allantois**<br /><br />6. **What is the cell division process directly related to the embryonic growth?**<br /> - **Answer: Mitosis**<br /><br />7. **Participation of more than one spermatozoon in fertilization is called __**<br /> - **Answer: Polyspermy**<br /><br />8. **Extra sperm which succeed in passing through the zona pellucida into the perivitelline space are called __**<br /> - **Answer: Spermatozoa**<br /><br />9. **How is the transport of ovum in the oviduct facilitated? (3 marks)**<br /> - **Answer: The transport of the ovum in the oviduct is facilitated by ciliary action, muscular contractions, and the presence of fluid currents within the oviduct.**<br /><br />10. **Explain the mechanisms underlying the blocks to polyspermy?**<br /> - **Answer: The blocks to polyspermy include the zona reaction (which prevents additional sperm from penetrating the zona pellucida) and the cortical reaction (which hardens the zona pellucida and causes the release of cortical granules, leading to changes in the zona pellucida that prevent sperm binding).**<br /><br />Feel free to ask if you need further clarification on any of these points!