er cycle during which sexual intercourse could result in fertilisation.\n\nGive your answer in the form:\nFrom day \$\\text{A}\$ to day \$\\text{B}\$","markscheme":"- Calculates the earliest day of the fertile window by subtracting sperm survival days from ovulation day: $15 - 4 = 11$ M1\n- Calculates the latest day of the fertile window by adding egg survival days to ovulation day: $15 + 2 = 17$ M1\n- Concludes the correct range is from day $11$ to day $17$ A1","marks":3,"order":0,"markingRubric":null,"explanation":{"methods":[{"id":"survival_window","label":"Use cell survival times","steps":[{"type":"hyper_latex","block":{"nodes":[{"latex":"\\text{earliest day}=15-\\htmlData{anchor=sperm}{4}"},{"latex":"\\text{earliest day}=\\htmlData{anchor=earliest}{11}"}],"connections":[{"to":"earliest","from":"sperm","color":"orange","label":"calculate"}]},"order":1,"title":"Find earliest day","description":"Sperm can survive for 4 days, so count back from ovulation on day 15. Subtracting the 4-day sperm survival time from day 15, giving 15 - 4 = 11, earns M1 for calculating the earliest day."},{"type":"hyper_latex","block":{"nodes":[{"latex":"\\text{latest day}=15+\\htmlData{anchor=egg}{2}"},{"latex":"\\text{latest day}=\\htmlData{anchor=latest}{17}"}],"connections":[{"to":"latest","from":"egg","color":"orange","label":"calculate"}]},"order":2,"title":"Find latest day","description":"The egg can survive for 2 days after ovulation, so count forwards from day 15. Adding the 2-day egg survival time to day 15, giving 15 + 2 = 17, earns M1 for calculating the latest day."},{"type":"text","order":3,"title":"State the range","content":"Therefore, the correct range is from day 11 to day 17. This earns A1 because the range itself is correct; include both endpoints and use the requested wording.","highlights":[{"text":"From day \$\\text{A}\$ to day \$\\text{B}\$","location":"specification"}]}]}],"generatedAt":"2026-07-22T11:29:43.224Z","modelVersion":"gpt-5.6-terra+diagrams-1","explanationVersion":"v3"},"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"7547bce8-c548-4848-b8d5-c604ab3a6a8f","revisionId":"0292bd16-e402-48d5-93fa-6124e09552eb","questionNumber":null,"questionType":"LA","specification":"The diagram shows the daily water intake for an adult on a temperate day. ![A pie chart titled 'Figure 1' showing the sources of daily water intake. The sectors are: Drinks (1350 cm³), Food (900 cm³), and Cellular respiration (250 cm³).](https://assets.mathsgenie.co.uk/aqa-qb/fd3ff914-896c-404d-953f-a967f764504b.png) The total water intake was \$2500\\text{ cm}^3\$.","difficulty":2,"difficultyBand":"easy","totalMarks":2,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"e1bd34f2-6045-40a1-a7f2-146a6c0a5ba8","label":null,"content":"Calculate the percentage of the total water intake that came from food.","markscheme":"- Sets up the calculation to find the percentage of water intake from food: $\\dfrac{900}{2500} \\times 100$ M1\n- Obtains $36\\%$ A1","marks":2,"order":0,"markingRubric":null,"explanation":{"methods":[{"id":"percentage_calculation","label":"Calculate the percentage","steps":[{"type":"text","order":0,"title":"Identify the two values","content":"Use the amount from **food** as the part, $900\\text{ cm}^3$, and the **total** intake as the whole, $2500\\text{ cm}^3$.\n\nA percentage tells you how many parts out of $100$ the food intake represents.","highlights":[{"text":"Food (900 cm³)","location":"specification"},{"text":"The total water intake was \$2500\\text{ cm}^3\$.","location":"specification"}]},{"type":"hyper_latex","block":{"nodes":[{"latex":"\\text{percentage from food}=\\htmlData{anchor=setup}{\\color{@sky}{\\frac{900}{2500}\\times100}}\\quad\\text{(M1)}"},{"latex":"\\text{percentage from food}=\\htmlData{anchor=result}{\\color{@green}{36\\%}}\\quad\\text{(A1)}"}],"highlights":[{"color":"sky","style":"text-color-with-background","anchor":"setup"},{"color":"green","style":"text-color-with-background"

5.3 Hormonal coordination in humans

Question 7

5.3 Hormonal coordination in humans Questions

5.3 Hormonal coordination in humans

Question 7

5.3 Hormonal coordination in humans Questions