Question

Question 9 How are polysaccharides and disaccharides digested?

Class - XI - Biology Chapter Digestion and Absorption Page No. 267

Answer 1

→Starch is converted into Maltose with the help of enzyme Amylopsin.
→That means polysaccharide is converted into disaccharide.

→Disaccharides are converted into Monosaccharide.

→Maltose is converted into Glucose + Glucose
★Enzyme used is Maltase.

→Lactose is converted into Glucose + Galactose
★Enzyme used is Lactase.

→Sucrose is converted into Glucose + Fructose
★Enzyme used is Sucrase or invertase.

Answer 2

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▶️ The digestion of carbohydrates starts in the mouth and completes in the small intestine region of the alimentary canal.

▶️ The enzymes that act on carbohydrates are collectively known as carbohydrases.

⏩ Digestion in the mouth:

▶️As food enters the mouth, it gets mixed with saliva.

▶️ Saliva – secreted by the salivary glands – contains a digestive enzyme called salivary amylase; also called as Ptyalin.

▶️ This enzyme breaks down starch into sugar at pH 6.8.

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