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Biology Chapter 2 : Topic 5
Structure and Functions of Carbohydrates
1 / 15
Carbohydrates are organic compounds mainly composed of:
Reasoning: Carbohydrates contain carbon, hydrogen, and oxygen, usually in a 1:2:1 ratio.
2 / 15
Which statement best defines carbohydrates?
Reasoning: Carbohydrates are the primary source of energy in living organisms.
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The basic building blocks of carbohydrates are:
Reasoning: Simple sugars (monosaccharides) are the structural units of carbohydrates.
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Which carbohydrate is directly used by cells to release energy?
Reasoning: Glucose is the main fuel used in cellular respiration.
5 / 15
A student eats bread before an exam. The immediate energy obtained from the bread is mainly due to:
Reasoning: Bread is rich in carbohydrates that are converted into glucose for energy.
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Which food contains the highest proportion of carbohydrates?
Reasoning: Rice is rich in starch, a carbohydrate.
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Which function of carbohydrates is most important during vigorous exercise?
Reasoning: Carbohydrates are rapidly broken down to provide energy.
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Starch is best described as:
Reasoning: Plants store excess glucose in the form of starch.
9 / 15
Which pair is correctly matched?
Reasoning: Starch is the storage carbohydrate in plants.
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Which carbohydrate is a major component of plant cell walls?
Reasoning: Cellulose provides strength and support to plant cell walls.
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An athlete requires a quick source of energy before a race. Which nutrient is most suitable?
Reasoning: Carbohydrates are the body's fastest available energy source.
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Which of the following is NOT a carbohydrate source?
Reasoning: Butter is mainly composed of lipids (fats).
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If carbohydrate intake becomes very low, the body will first experience difficulty in:
Reasoning: Carbohydrates are the body's primary source of readily available energy.
14 / 15
Which structure is common to all carbohydrates?
Reasoning: All carbohydrates contain carbon, hydrogen, and oxygen.
15 / 15
A plant stores excess food mainly in the form of:
Reasoning: Starch is the principal storage carbohydrate in plants.
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