Free daily NEET & JEE PYQs, quizzes & mock tests on TelegramJoin free →

NEET Biology: Classification aldoses and ketoses monosaccharides and oligosaccharides Practice Questions

13 free multiple-choice questions on Classification aldoses and ketoses monosaccharides and oligosaccharides (Carbohydrates) for NEET Biology, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.

Practice thousands more NEET questions in the app →

  1. Q1. Sucrose, a common table sugar, is an example of which type of carbohydrate?

    • AMonosaccharide
    • BKetose
    • CDisaccharide
    • DAldose
    Show answer & explanation

    Correct answer: C — Disaccharide

    Sucrose is formed by the linkage of two monosaccharide units (glucose and fructose), making it a disaccharide.

  2. Q2. Sucrose is a disaccharide formed by the linkage of which two monosaccharides?

    • AGlucose and Fructose
    • BGlucose and Ribose
    • CFructose and Galactose
    • DGlucose and Galactose
    Show answer & explanation

    Correct answer: A — Glucose and Fructose

    Sucrose is a disaccharide formed from the covalent linkage of one molecule of glucose and one molecule of fructose.

  3. Q3. Fructose is an example of which type of monosaccharide?

    • AKetose
    • BAldohexose
    • CAldose
    • DAlditol
    Show answer & explanation

    Correct answer: A — Ketose

    Fructose is a ketohexose, meaning it is a ketose and has six carbon atoms.

  4. Q4. Which classification of carbohydrates consists of a single sugar unit?

    • APolysaccharides
    • BMonosaccharides
    • CDisaccharides
    • DOligosaccharides
    Show answer & explanation

    Correct answer: B — Monosaccharides

    Monosaccharides are the simplest form of carbohydrates, consisting of a single sugar unit (e.g., glucose, fructose).

  5. Q5. Which class of monosaccharides contains a ketone functional group in its open-chain form?

    • AAldohexoses
    • BAlditol
    • CAldoses
    • DKetoses
    Show answer & explanation

    Correct answer: D — Ketoses

    Ketoses are monosaccharides that possess a ketone functional group in their open-chain form, distinguishing them from aldoses which possess an aldehyde group.

  6. Q6. Which of the following functional groups defines an aldose sugar?

    • AAn ether group
    • BAn aldehyde group
    • CA hydroxyl group
    • DA ketone group
    Show answer & explanation

    Correct answer: B — An aldehyde group

    Aldoses are monosaccharides that contain an aldehyde functional group (R-CHO).

  7. Q7. Which relationship is correctly defined between monosaccharides and polysaccharides?

    • AMonosaccharides are the basic building blocks of polysaccharides.
    • BPolysaccharides are only aldoses.
    • CMonosaccharides are only found in fats.
    • DPolysaccharides are simple sugars.
    Show answer & explanation

    Correct answer: A — Monosaccharides are the basic building blocks of polysaccharides.

    Monosaccharides (like glucose) serve as the fundamental monomer units that link together to form complex carbohydrates known as polysaccharides (like starch or cellulose).

  8. Q8. Which molecule is an example of an oligosaccharide?

    • ASucrose
    • BGlucose
    • CRibose
    • DFructose
    Show answer & explanation

    Correct answer: A — Sucrose

    Oligosaccharides are carbohydrates composed of more than one monosaccharide unit. Sucrose is a disaccharide (formed by glucose and fructose), making it an oligosaccharide.

  9. Q9. Aldoses are generally more readily oxidized than ketoses in aqueous solution because:

    • AKetones are more stable in the presence of water.
    • BThe geometry of the aldehyde group facilitates easier oxidation.
    • CThe aldehyde group is more easily oxidized to a carboxyl group.
    • DAldoses have a higher electronegativity.
    Show answer & explanation

    Correct answer: C — The aldehyde group is more easily oxidized to a carboxyl group.

    The aldehyde group in aldoses is more readily oxidized (more easily loses electrons) to form a carboxyl group than the ketone group in ketoses.

  10. Q10. Ketoses are characterized by the presence of which functional group in their open-chain form?

    • AAldehyde
    • BAlcohol
    • CKetone
    • DCarboxyl
    Show answer & explanation

    Correct answer: C — Ketone

    Ketoses are monosaccharides that possess a ketone functional group (C=O) in their structure, distinguishing them from aldoses which have an aldehyde group.

  11. Q11. Which of the following is a pentose sugar?

    • AFructose
    • BGalactose
    • CGlucose
    • DRibose
    Show answer & explanation

    Correct answer: D — Ribose

    Pentose sugars are monosaccharides that have five carbon atoms, such as ribose and deoxyribose.

  12. Q12. Which of the following monosaccharides is an aldose?

    • AFructose
    • BRibulose
    • CSucrose
    • DGlucose
    Show answer & explanation

    Correct answer: D — Glucose

    Aldoses are monosaccharides containing an aldehyde functional group. Glucose, ribose, and aldonic acids are examples of aldoses. Fructose is a ketose, and sucrose is a disaccharide.

  13. Q13. Which type of carbohydrate is primarily known as a polysaccharide?

    • ASucrose
    • BStarch
    • CGlucose
    • DFructose
    Show answer & explanation

    Correct answer: B — Starch

    Polysaccharides are complex carbohydrates made up of many monosaccharide units linked together (e.g., starch, glycogen).

Keep going — practice on Padhai Karlo

Padhai Karlo gives you unlimited NEET practice: chapter-wise questions, timed quizzes, and full mock tests with an All-India Rank — free to start.

Get the free Android app →

More Carbohydrates topics

← All Carbohydrates practice