General Science IBDP Biology Uncategorized 11.4 Sexual Reproduction June 2, 2021 Shveta 0 Comments Animal Physiology, IBDP Biology, Sexual Reproduction 1.The diagram shows the female reproductive system. [Source: © International Baccalaureate Organization 2017] Which structures do K and L identify? ABCD2. Which structure found in eukaryotes has a single membrane?Nucleus Lysosome Chloroplast Mitochondrion 3. Which hormone is inhibited during pregnancy in order to prevent contractions of the uterus?Oxytocin Progesterone Estrogen FSH 4. The diagram shows the exchange processes that take place in the placenta between the maternal and fetal blood. Which process requires endocytosis? ABCD5. What does the blastocyst secrete?HCG Estrogen ADH Progesterone 6. What helps to prevent polyspermy?The unequal division of oocytes The placental barrier The contraceptive pill The cortical reaction 7. Where does the acrosome reaction occur? ABCD8. The image shows a section of a seminiferous tubule. What is shown by the letter X?Meiosis I in a primary spermatocyte A spermatogonium undergoing mitosisMeiosis II in a secondary spermatocyte A spermatid undergoing meiosis 9. Through what process does a spermatid become a functioning spermatozoan?Mitosis Differentiation Fertilization Meiosis 10. The image shows the male reproduction system. Where is prostate cancer likely to start developing?In X only In Y and Z only In Z only In X, Y and Z 11. What is the function of the epididymis in the male reproduction system?To stimulate sperm production by secreting testosterone To store the sperm in the final stages of maturation To provide fluids to nourish the sperm To transport the sperm from the testes to the urethra12. From where is human chorionic gonadotropin (HCG) secreted in early pregnancy?Embryo Corpus luteum Ovary Pituitary gland 13. The image shows the male reproduction system. Where is prostate cancer likely to start developing?In X only In Y and Z only In Z only In X, Y and Z 14. Which event takes place during normal fertilization?The acrosome fuses with the egg membrane The entire sperm cell enters the egg cytoplasmThe egg divides to form a blastocysThe cortical granules fuse with the egg membrane15. What is the correct order of events in fertilization?fusion of gametes, acrosome reaction and then cortical reaction cortical reaction, fusion of gametes and then acrosome reaction acrosome reaction, fusion of gametes and then cortical reaction fusion of gametes, cortical reaction and then acrosome reaction 16. What is secreted after implantation of the blastocyst in the uterine wall? Estrogen which stimulates the degeneration of the corpus luteumHCG which prevents the degeneration of the corpus luteumEstrogen which prevents the degeneration of the corpus luteum HCG which stimulates the degeneration of the corpus luteum 17. What is the role of HCG (human chorionic gonadotrophin) in early pregnancy?It stimulates the release of FSH (follicle stimulating hormone)It maintains the corpus luteumIt inhibits the release of progesteroneIt stimulates implantation of the blastocyst18. Where is human chorionic gonadotrophin (HCG) produced?Ovary Anterior pituitary Embryo Posterior pituitary 19. What is a difference between spermatogenesis and oogenesis? ABCD20. What is a blastocyst?An unfertilized egg surrounded by follicle cellsAn unfertilized egg cell expelled by menstruationThe follicle when it has swelled up with fluid The embryo when it has become a hollow ball of cells 21. The micrograph shows the structure of a testis undergoing spermatogenesis. What is the structure labelled X?Sperm Sertoli cell Leydig cell Germinal epithelium cell 22. Which is the correct sequence of stages in fertilization? ABCD