REPRODUCTIVE ORGANS, GAMETES AND FERTILISATION

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1 HOMEWORK 1 REPRODUCTIVE ORGANS, GAMETES AND FERTILISATION MARK 5 1. A function of the interstitial cells in the testes is to produce A sperm B testosterone C seminal fluid D follicle stimulating hormone (FSH) 3. The diagram below shows a section through the seminiferous tubules in testes. Which cell produces testosterone? 2. The sperm counts of a sample of men taken between 1940 and 2000 are shown in the graph below. 4. One function of the seminal vesicles is to A produce testosterone B allow sperm to mature C store sperm temporarily D produce nutrients for sperm 5. The table below contains information about four semen samples What is the average reduction in sperm count per year? A 0.67 million/cm 3 /year B 0.75 million/cm 3 /year C 0.92 million/cm 3 /year D 45 million/cm 3 /year Which semen sample has the highest number of active sperm per cm 3

2 HOMEWORK 2 HORMONAL CONTROL OF REPRODUCTION MARK The graph below shows changes in the concentrations of the hormones X and Y in the blood during the menstrual cycle. 3. The graph below shows the hormones involved in the menstrual cycle. Which of the following correctly identified hormones X and Y Which line represents oestrogen? 4. The diagram below shows the influence of the pituitary gland on testosterone production. 2. Changes in the ovary during the menstrual cycle are described below 1 corpus luteum forms 2 ovulation occurs 3 progesterone is produced 4 corpus luteum degenerates 5 Graafian follicle develops What is hormone X? The sequence in which these changes occur following menstruation is A 2, 3, 1, 5, 4 B 2, 1, 3, 4, 5 C 5, 3, 2, 1, 4 D 5, 2, 1, 3, 4 A B C D luteinising hormone follicle stimulating hormone oestrogen progesterone

3 5. From which structure in the female reproductive system does a corpus luteum develop? A endometrium B graafian follicle C fertilised ovum D unfertilised ovum 6. The diagram below represents part of the mechanism which controls ovulation The hormones indicated about are

4 7. The flowchart summarises the processes involved in the production of semen. (a) Name hormone X and tissue Y Hormone X Tissue Y 2 (b) Semen contains substances secreted by structure Z. (i) Identify structure Z (ii) Describe how a named substance from structure Z aids fertilisation Substance Description 1 (c) Complete the table to show the percentage of each type of cell which would contain a Y chromosome. 1

5 8. The graphs below show changes in the volume and composition of milk produced by a woman in week following the birth of her child.

6 (a) From graph 2, describe two ways in which the composition of milk produced in the first three days after birth differs from milk produced later (b) What was the volume of milk produced on day 3? 1 (c) Express, as a whole a number ratio, the concentration of IgA compared to the concentration of lactose produced on Day 6. (1g = 1000mg) Space for calculation : 1 (d) Using Graphs 1 and 2, calculate the mass of lactose produced on day 5. Space for calculation g 1

7 9. The graph below shows the concentrations of ovarian hormones in a woman s blood during her menstrual cycle. (a) Name hormone X 1 (b) What effect does oestrogen have on the following structures? (i) The uterus between days 4 and 12 in the cycle 1 (ii) The pituitary gland on day 12 of the cycle 1 (c) Describe one way in which the graph would be different if the woman became pregnant during her cycle. 1

8 9. (continued) (d) The diagram below shows two structures found at different times in the menstrual cycle. (i) Name structures P and Q P Q 1 (ii) What key event in the menstrual cycle occurs before P develops into Q? 1

9 10. The diagrams represent gamete production in the ovary and part of a testis. (a) (i) Which letter represents a mature ovum? 1 (ii) Identify one labelled part of each organ that is affected by FSH. 2 (iii) Describe the effect of testosterone on the testes of an adult. 1

10 11. The graphs below show the plasma concentrations of certain hormones throughout a woman s menstrual cycle Graph 1 shows the concentrations of FSH and LH Graph 2 shows the concentrations of two other hormones, X and Y

11 (a) Where in the body are FSH and LH produced? 1 (b) Name hormones X and Y X Y 1 (c) What is the maximum concentration of hormone Y? units 1 (d) On which day did ovulation occur? Give a reason for your answer. Day Reason 1 (e) During her next cycle, the woman became pregnant. Describe any differences which would occur in the concentrations of FSH and hormone Y after day 25 FSH 1 Hormone Y 1

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