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Science (086) — AI-generated practice question

AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.

Q1. [1] straightforward exam-ready
Respiration is classified as an exothermic reaction because: (A) It produces carbon dioxide as a waste product (B) It requires sunlight to proceed (C) Energy is released during the breakdown of glucose (D) It takes in oxygen from the surroundings
  1. A It produces carbon dioxide gas
  2. B It requires sunlight to proceed
  3. C It releases energy in the form of heat
  4. D It absorbs oxygen from the atmosphere
Generated by claude-sonnet-4-6 · 2026-06-26 00:53 · grounding rag
Model Answer

(C) It releases energy in the form of heat

During respiration, glucose (organic compound) is broken down, releasing energy. Since energy is released in the process, it is classified as an exothermic reaction.

Explanation

The key link is between two chapters: Ch. 1 defines exothermic reactions as those in which heat/energy is given out, and Ch. 5 states that during respiration, organic compounds like glucose are broken down to provide energy. Option C correctly combines both ideas. Options A and D describe products/reactants of respiration, not why it is exothermic. Option B describes photosynthesis, not respiration.

Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.