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GCSE Biology · key term
An insoluble carbohydrate into which plants convert glucose for storage.
Used by AQA and OCR
Specification 4.4.1.3 · Paper 1
Revise: Glucose UtilizationA plant can convert glucose into insoluble starch. Because starch is insoluble, it can be stored in plant tissues, including roots, stems and leaves. When glucose is later needed—for example, when photosynthesis is not occurring—the stored starch can be broken down to provide glucose.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A carbohydrate made from glucose that plants can store; iodine solution turns blue-black in its presence.
Revise: Process of PhotosynthesisA plant can use some of the glucose in respiration, convert some into starch for storage, and use some to make substances needed for growth.
Link each conversion to its purpose: starch and fats/oils for storage, cellulose for cell-wall strength, and amino acids for making proteins.
A blue-black iodine result shows starch is present. Compare a treated leaf with a suitable control before concluding which condition photosynthesis requires.
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