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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 thorough-understanding
Glucose is a six-carbon molecule. When it is broken down during cellular respiration, the first step produces a three-carbon molecule. What is this molecule, and where in the cell does this first step occur?
Generated by claude-sonnet-4-6 · 2026-06-26 01:00 · grounding rag
Model Answer

The three-carbon molecule produced is pyruvate. This first step of cellular respiration (glycolysis) occurs in the cytoplasm of the cell.

Explanation

CBSE expects students to name the product (pyruvate/pyruvic acid) and the location (cytoplasm). Exercise Q4 of Chapter 5 confirms that the breakdown of pyruvate occurs in mitochondria — implying glycolysis (the prior step producing pyruvate) happens in the cytoplasm. Both facts are needed for full credit in a 1-mark question like this.

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