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Science — AI-generated practice question

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

Q1. [2] medium initial-understanding
How many chambers does a fish heart have, and how many times does blood pass through it in one cycle?
Generated by claude-sonnet-4-6 · 2026-06-10 02:57 · grounding rag
Model Answer

A fish heart has two chambers — one atrium and one ventricle. Blood passes through the fish heart only once in one complete cycle (single circulation). The blood is pumped from the heart to the gills for oxygenation, then directly to the rest of the body.

Source: Chapter 5, Section 5.4.1 — Transportation in Human Beings

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Explanation

The examiner expects two clear facts: (1) two chambers, and (2) single circulation (blood passes once). Naming the chambers (atrium and ventricle) adds accuracy and may fetch full marks. Contrast with double circulation in other vertebrates is not required here but briefly mentioning "single circulation" by name shows command of terminology.

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