er temperature reduces the kinetic energy of water molecules and the rate of evaporation, limiting transpiration.","order":3}],"explanation":null,"firstAttemptFullMarks":null},{"id":"cef1281e-8c67-4034-9b64-d3456daa6f4a","revisionId":"1ba22a31-fea0-43b9-9827-5e39b90f6e8e","questionNumber":null,"questionType":"LA","specification":"Multicellular organisms require specialised transport systems and exchange surfaces to move substances efficiently throughout their bodies.","difficulty":3,"difficultyBand":"easy","totalMarks":6,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"be23bdea-01f3-484f-97e7-bc5ae3ac726e","label":"a","content":"The words in the list below represent various organs, vessels, tissues, and processes in animals and plants.\n\n* Coronary arteries\n* Phloem\n* Renal artery\n* Renal vein\n* Translocation\n* Ureter\n* Vena cava\n* Xylem\n\nAnswer parts **(i)**, **(ii)**, and **(iii)** using words from this list.\n\n**(i)** Name the blood vessels that branch off the aorta to supply oxygenated blood directly to the heart muscle.\n\n**(ii)** Name the plant tissue responsible for transporting dissolved sugars (such as sucrose) from the leaves to the rest of the plant.\n\n**(iii)** Name the major vein that returns deoxygenated blood from the body back to the right atrium of the heart.","markscheme":"- (i) Coronary arteries B1\n- (ii) Phloem B1\n- (iii) Vena cava B1","marks":3,"order":0,"markingRubric":null,"explanation":{"methods":[{"id":"match_transport_terms","label":"Match each transport clue","steps":[{"type":"text","order":1,"title":"Match the heart supply","content":"For **(i)**, focus on the vessel that supplies the heart muscle itself. The aorta carries oxygenated blood away from the heart, and the vessels branching from it to feed the heart muscle are the **coronary arteries**.\n\nWrite **Coronary arteries**. This exact identification earns **B1**.","highlights":[{"text":"branch off the aorta to supply oxygenated blood directly to the heart muscle","location":"specification"}]},{"type":"text","order":2,"title":"Match the sugar tissue","content":"For **(ii)**, the clue is **dissolved sugars** moving away from the leaves. **Phloem** is the plant tissue that transports dissolved sugars, including sucrose, around the plant.\n\nWrite **Phloem**. This exact identification earns **B1**.","highlights":[{"text":"transporting dissolved sugars (such as sucrose) from the leaves to the rest of the plant","location":"specification"}]},{"type":"text","order":3,"title":"Match the returning vein","content":"For **(iii)**, look for the large vein returning blood from the body to the right atrium. The **vena cava** carries deoxygenated blood back to the heart.\n\nWrite **Vena cava**. This exact identification earns **B1**.","highlights":[{"text":"returns deoxygenated blood from the body back to the right atrium of the heart","location":"specification"}]}]}],"generatedAt":"2026-07-22T09:00:30.900Z","modelVersion":"gpt-5.6-terra+diagrams-1","explanationVersion":"v3"},"options":[]},{"id":"4f25d8bf-5edb-45b0-ad2b-b2140d07009b","label":"b","content":"Substances move into and out of cells across exchange surfaces via different transport mechanisms.\n\nDecide which method of transport is used for each process. Copy the table or select the correct cell for each row:\n\n| Process / Substance movement | Active transport | Diffusion | Osmosis |\n| :--- | :---: | :---: | :---: |\n| Oxygen gas moving from the air in the alveoli into the surrounding capillary blood | | | |\n| Nitrate ions being absorbed from a lower concentration in the soil into root hair cells | | | |\n| Water being reabsorbed from the filtrate in the kidney tubules back into the blood | | | |","markscheme":"- Oxygen gas moving: **Diffusion** B1\n- Nitrate ions being absorbed: **Active transport** B1\n- Water being reabsorbed: **Osmosis** B1","marks":3,"order":1,"markingRubric":null,"explanation":{"methods":[{"id":"identify_transport","label":"Identify the transport method","s

The challenges of size

Question 8

The challenges of size Questions

The challenges of size

Question 8

The challenges of size Questions