Active transport — Easy
Recall and familiar applications. Optional hints help you find a first step.
Includes extension practice
Active transport and root-hair ion uptake are required. The separate protein-carrier mechanism in this shared set adds detail beyond the listed combined-science outcomes.
Easy, Normal and Difficult describe practice demand; they are not the official Core and Extended tiers.
- Cambridge 0653 syllabus2028–2029 · B3.3.1–2
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