Reproduction In Plants & Humans

9.Which of the following statements about HIV is correct?

10.A flower has small, dull petals, no scent, and produces large amounts of lightweight pollen. What is the most likely method of pollination?

11.During the menstrual cycle, which event occurs when oestrogen levels reach their peak?

12.Which of the following is a correct difference between sperm and egg cells?

13.In an investigation into the conditions required for germination, four test tubes containing cress seeds on cotton wool were set up as follows: Tube A: dry cotton wool at 20°C; Tube B: moist cotton wool at 20°C; Tube C: moist cotton wool in a sealed container with no oxygen at 20°C; Tube D: moist cotton wool at 4°C. After one week, which tube would show the highest percentage of germinated seeds?

14.The graph below shows the number of reported cases of chlamydia in females in different age groups in one country. Which age group has the highest number of reported cases?

15.In a population of plants, 64% of individuals show the dominant phenotype for a trait controlled by a single gene with two alleles. Assuming Hardy-Weinberg equilibrium, what is the frequency of the recessive allele?

16.A student counts the number of pollen grains on the stigmas of wind-pollinated and insect-pollinated flowers in a field. She finds an average of 50 pollen grains per stigma on wind-pollinated flowers and 10 on insect-pollinated flowers. Which conclusion is most likely?

17.Which of the following is a correct difference between wind-pollinated and insect-pollinated flowers?

18.In the menstrual cycle, a peak in which hormone directly triggers ovulation?

19.A woman has a 28-day menstrual cycle. If ovulation occurs on day 14, on which day would you expect the highest level of progesterone?

20.Which structure in the human female reproductive system is the site of fertilisation?

21.Which of the following is an adaptation of a sperm cell that helps it reach the egg?

22.In an experiment, seeds are placed in a sealed container with moist cotton wool and kept at 25°C. After 5 days, none have germinated. Which factor is most likely missing?

23.Which of the following is a sexually transmitted infection (STI) caused by a bacterium?

24.The diagram shows a flower with large, brightly coloured petals, a strong scent, and nectar. Which type of pollination is most likely?

25.In an investigation into the conditions required for germination, four test tubes containing cress seeds on cotton wool were set up as follows: Tube A: dry cotton wool, 20°C; Tube B: moist cotton wool, 20°C; Tube C: moist cotton wool with a layer of oil to exclude air, 20°C; Tube D: moist cotton wool, 4°C. After 5 days, which tube would show germination?

26.A student counts the number of pollen grains on the stigmas of wind-pollinated and insect-pollinated flowers in a field. She finds an average of 50 pollen grains on the stigmas of wind-pollinated flowers and 2000 on insect-pollinated flowers. Which conclusion is most supported?

27.Which of the following correctly describes the role of the placenta during pregnancy?

28.What is the function of the prostate gland in the male reproductive system?

29.A woman has a 28-day menstrual cycle. On day 14, a surge in LH triggers ovulation. If fertilisation occurs, which hormone will remain high to maintain the uterine lining?

30.Which of the following is an adaptation of an egg cell that helps in fertilisation?

31.What is the name of the process by which pollen is transferred from the anther to the stigma?

32.In an experiment to investigate the effect of temperature on germination, 20 seeds are placed in each of three petri dishes with moist filter paper. Dish 1 is kept at 5°C, dish 2 at 20°C, and dish 3 at 35°C. After 7 days, dish 1 has 2 germinated seeds, dish 2 has 18, and dish 3 has 15. What is the most likely conclusion?

33.Which sequence correctly describes the path of sperm from production to ejaculation?

34.What is the main function of the amniotic fluid?

35.A student sets up an experiment to investigate the effect of light on germination. 50 seeds are placed on moist cotton wool in a light-proof box at 20°C, and another 50 seeds on moist cotton wool in a transparent box at 20°C. After 7 days, both sets show 48 germinated seeds. What can be concluded?

36.Which term describes the fusion of the nuclei of a male gamete and a female gamete?

37.Which of the following is a method of asexual reproduction in plants?

38.What is the function of the anther in a flower?

39.Which of the following is an adaptation of wind-pollinated flowers?

40.In humans, how many chromosomes are present in a sperm cell?