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  Class 10 Science Assertion Reason Quiz | 50 Questions | StudyBeacon Class 10 Science – Assertion & Reason Online Quiz (50 Questions) Instructions: Select the correct option and click Show Answer to reveal explanation. Options: A. Both A and R are true and R is the correct explanation B. Both A and R are true but R is not the correct explanation C. A is true but R is false D. A is false but R is true Q1. Assertion: Mitochondria are called powerhouse of the cell. Reason: They synthesize ATP during respiration. A B C D Answer: A Explanation: ATP is the energy currency produced by mitochondria. Show Answer Q2. Assertion: Anaerobic respiration produces less energy. Reason: Glucose is incompletely oxidized. A B C D Answer: A Explanation: Partial breakdown of glucose releases less energy. Show Answer Q3. Assertion: Alveoli increase efficiency of respiration. Reason: They provide large surface area. A B C D Answer: A...

  Class 10 Science Most Important MCQs | Top 25 Questions | StudyBeacon Home › Class 10 Science › Most Important MCQs Class 10 Science – 25 Most Important MCQs (All Chapters) These 25 MCQs are the highest-yield questions repeatedly asked or implied in CBSE exams. Focus on concepts, not memorization. Biology (Q1–Q9) Q1. Energy currency of cell is: [Easy] ADP ATP NADH FAD Answer: ATP stores usable energy. Q2. Which tissue transports food in plants? [Easy] Xylem Phloem Cortex Cambium Answer: Phloem → translocation. Q3. Site of fertilization in humans: [Easy] Uterus Fallopian tube Ovary Cervix Answer: Ampulla of oviduct. Q4. Which gas is released in photosynthesis? [Easy] CO₂ O₂ N₂ H₂ Answer: Oxygen is by-product. Q5. Longest part of human brain: [Moderate] Cerebellum Midbrain Medulla oblongata Pons Answer: Controls vital reflexes. Q6. Which blood vessels have valves? [Moderate] Arteries Vein...