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The type of carbohydrate predominantly found in potatoes is __________.
Sugar
Glucose
Starch
Fructose
Starch
Potatoes are a primary storage organ for plants, storing energy in the form of starch. Starch is a polysaccharide composed of repeating glucose units linked together, making it the most abundant carbohydrate in tubers.
Potatoes are a primary storage organ for plants, storing energy in the form of starch. Starch is a polysaccharide composed of repeating glucose units linked together, making it the most abundant carbohydrate in tubers.
Think of starch as a 'battery pack' for the potato plant; while glucose is like the raw electric charge, starch is the stored, stable chemical energy ready to be converted back when the plant needs to grow.
n(C6тАЛH12тАЛO6тАЛ)тЖТ(C6тАЛH10тАЛO5тАЛ)nтАЛ+n(H2тАЛO) тАФ The dehydration synthesis reaction showing glucose units forming a starch polymer.
Plants perform photosynthesis to create glucose (C6тАЛH12тАЛO6тАЛ). Since glucose is soluble and reactive, plants polymerize these molecules into long, insoluble starch chains (amylose and amylopectin) for efficient long-term energy storage within specialized organelles called amyloplasts.
Starch consists of two polysaccharides: amylose (linear) and amylopectin (branched).
Potatoes are classified as starchy vegetables due to their high carbohydrate density.
Iodine solution is the standard laboratory indicator used to test for the presence of starch, turning blue-black upon contact.
Starch is an insoluble, compact molecule allowing for high-density energy storage in plant cells.
Excessive consumption of starchy foods can lead to rapid spikes in blood glucose levels due to enzymatic breakdown.
Primary dietary energy source for human populations globally.
Industrial use in the production of bio-plastics, adhesives, and thickeners.
The empirical formula for starch is (C6тАЛH10тАЛO5тАЛ)nтАЛ.
Option A is incorrect because sugar is a general term often referring to simple disaccharides like sucrose. Option B is incorrect because glucose is the monomeric unit, not the bulk storage form. Option D is incorrect because fructose is a monosaccharide primarily found in fruits.
C is correct тАФ Starch is the complex carbohydrate (polysaccharide) stored as the main energy reserve in potatoes.
Always remember that plants store energy as starch, while animals store energy as glycogen; this is a frequent point of confusion in comparative biology.
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