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Rajasthan Board Class 10 (RBSE) Biology — practice by topic

Browse 103 questions across 11 Biology topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Biology topics

Life Processes (38)Science (32)Control and Coordination (28)Heredity (16)Heredity and Evolution (12)Biology (6)C10excretion (4)C10heredity (4)C10respiration (3)Lifelines of National Economy (3)Our Environment (3)

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As per your syllabus, in AEROBIC respiration, where in the cell does the breakdown of PYRUVATE using oxygen take place?Read the answer and worked solution →As per your syllabus, what does ANAEROBIC respiration in YEAST produce from pyruvate?Read the answer and worked solution →As per your syllabus, what is the energy released when the TERMINAL PHOSPHATE bond in ATP is broken using water?Read the answer and worked solution →As per your syllabus, Biology Ch 5, how many CHAMBERS does the human heart have?Read the answer and worked solution →

Worked practice questions

As per your syllabus, in AEROBIC respiration, where in the cell does the breakdown of PYRUVATE using oxygen take place?

  1. Cytoplasm only
  2. Ribosomes
  3. Nucleus
  4. Mitochondria
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Correct answer: D. Mitochondria

As per your syllabus, aerobic respiration of pyruvate occurs in mitochondria — the cell's powerhouse. The first step (glycolysis) is in cytoplasm.

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As per your syllabus, what does ANAEROBIC respiration in YEAST produce from pyruvate?

  1. Pure CO₂
  2. Ethanol (alcohol) + CO₂ — this is fermentation
  3. Pure water
  4. Lactic acid
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Correct answer: B. Ethanol (alcohol) + CO₂ — this is fermentation

As per your syllabus, yeast fermentation: pyruvate → ethanol + CO₂. Lactic acid is the muscle-cell pathway under low oxygen.

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As per your syllabus, what is the energy released when the TERMINAL PHOSPHATE bond in ATP is broken using water?

  1. About 30.5 kJ/mol
  2. About 100 J
  3. Several MJ
  4. Zero — no energy
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Correct answer: A. About 30.5 kJ/mol

As per your syllabus, ATP box, terminal phosphate hydrolysis releases ~30.5 kJ/mol — used to drive endothermic cellular reactions.

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