e average rate of water loss for Plant P between 2 hours and 4 hours. Include the correct unit in your answer.","markscheme":"- Identifies volume lost by Plant P at $2\\text{ hours}$ is $12\\text{ cm}^3$ and at $4\\text{ hours}$ is $28\\text{ cm}^3$, and finds change in volume: $28 - 12 = 16\\text{ cm}^3$ M1\n- Divides by the time elapsed ($2\\text{ hours}$): $\\frac{16}{2}$ M1\n- States correct rate of $8$ with unit $\\text{cm}^3/\\text{hour}$ (or $\\text{cm}^3\\text{ hour}^{-1}$) A1","marks":3,"order":1,"markingRubric":null,"explanation":{"methods":[{"id":"change_over_time","label":"Change in volume over time","steps":[{"type":"text","order":0,"title":"Read the two values","content":"Use the **Plant P** line only. At 2 hours, the volume lost is $12\\text{ cm}^3$; at 4 hours, it is $28\\text{ cm}^3$.","highlights":[{"text":"Calculate the average rate of water loss for Plant P between 2 hours and 4 hours.","location":"specification"}]},{"type":"hyper_latex","block":{"nodes":[{"latex":"\\htmlData{anchor=volume-change}{28\\text{ cm}^3-12\\text{ cm}^3}"},{"latex":"\\htmlData{anchor=volume-lost}{16\\text{ cm}^3}"}],"highlights":[{"color":"green","style":"box","anchor":"volume-lost"}],"connections":[{"to":"volume-lost","from":"volume-change","color":"sky","label":"subtract"}]},"order":1,"title":"Find the volume change","description":"The readings of 12 cm³ at 2 hours and 28 cm³ at 4 hours give 28 - 12 = 16 cm³; this earns the first method mark (M1)."},{"type":"hyper_latex","block":{"nodes":[{"latex":"\\text{average rate}=\\frac{\\text{change in volume}}{\\text{time taken}}"},{"latex":"\\frac{16\\text{ cm}^3}{2\\text{ hours}}=\\htmlData{anchor=final-rate}{8\\text{ cm}^3\\text{ hour}^{-1}}"}],"highlights":[{"color":"green","style":"box","anchor":"final-rate"}]},"order":2,"title":"Divide by elapsed time","description":"Average rate means change in volume divided by time taken. The interval from 2 to 4 hours lasts 2 hours, so this division earns the second method mark (M1). The answer is 8 cm³ hour⁻¹. Including this unit earns the accuracy mark (A1)."}]}],"generatedAt":"2026-07-22T11:42:10.055Z","modelVersion":"gpt-5.6-terra+diagrams-1","explanationVersion":"v3"},"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"4e5964ea-da2e-4627-9d76-71353e9c3cef","revisionId":"c5c737cb-7f79-44ae-9959-b4f0f7ab4c43","questionNumber":null,"questionType":"LA","specification":"Table 1 shows the mean rate of transpiration for four different tomato cultivars under controlled conditions.\n\n| Tomato cultivar | Mean rate of transpiration ($\\text{g}\\ \\text{m}^{-2}\\ \\text{h}^{-1}$) |\n| :---: | :---: |\n| P | 5.82 |\n| Q | 2.14 |\n| R | 1.68 |\n| S | 3.45 |","difficulty":3,"difficultyBand":"easy","totalMarks":2,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"2ea764bd-acf5-40c6-a5c1-e5668ec4ce57","label":null,"content":"Calculate how many times greater the mean rate of transpiration of cultivar P is than the mean rate of transpiration of cultivar R.\n\nGive your answer to 2 significant figures.","markscheme":"- Shows a correct calculation setup by dividing the transpiration rate of cultivar P by that of cultivar R: $\\dfrac{5.82}{1.68}$ (or obtains $3.464...$) M1\n- Gives the final answer rounded correctly to 2 significant figures: $3.5$ A1","marks":2,"order":0,"markingRubric":null,"explanation":{"methods":[{"id":"compare_rates","label":"Divide to compare rates","steps":[{"type":"text","order":0,"title":"Choose the comparison","content":"“How many times greater” asks for a ratio. Divide cultivar P’s mean rate by cultivar R’s mean rate, in that order.","highlights":[{"text":"how many times greater the mean rate of transpiration of cultivar P is than the mean rate of transpiration of cultivar R","location":"specification"}]},{"type":"hyper_latex","block":{"nodes":[{"latex":"\\htmlData{anchor=fraction}{\\dfrac{5.82}{1.68}}"},{"latex":"\\htmlData{anchor=quotient}{=3.464285714\\ldots}"}],"highlights":[{"color":"sky","style":"

2.3 Plant tissues, organs and systems

Question 2

2.3 Plant tissues, organs and systems Questions

2.3 Plant tissues, organs and systems

Question 2

2.3 Plant tissues, organs and systems Questions