Commercial glucose is obtained by hydrolyzing starch through boiling it with dilute H₂SO₄ at 393 K under pressure. Starch serves as the raw material for this process.
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Glucose can be prepared from sucrose by boiling it with dilute HCl or H₂SO₄ in alcoholic solution. The products obtained are equal amounts of glucose and fructose through the hydrolysis of sucrose.
A strip of secondary meristem located in the cortex of older plants forms cork tissue, which constitutes the outer protective layer. This process is known as cork cambium activity.
The outer layer of a branch of a tree typically undergoes changes as the plant ages, forming cork tissue to provide additional protection. In contrast, the outer layer of a young stem may consist of primary meristem and epidermal tissue.
Desert plants often have a thick waxy coating of cutin on the outer surface of their epidermis. This cuticle acts as a waterproof barrier, reducing water loss through transpiration and helping the plant conserve water in arid environments.