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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] medium exam-ready
When germinating bean seeds are placed so that only one side receives light, the shoots bend towards the light source. Which hormone, and from where, is responsible for this bending?
  1. A Gibberellin, synthesised in the roots
  2. B Auxin, synthesised at the shoot tip and diffusing to the shady side
  3. C Cytokinin, synthesised in the leaves and moving to the stem
  4. D Abscisic acid, synthesised throughout the plant body
Generated by claude-sonnet-4-6 · 2026-06-26 01:00 · grounding rag
Model Answer

Answer: B

Auxin, synthesised at the shoot tip, diffuses to the shady side of the shoot, causing cells there to grow longer, making the shoot bend towards light.

Source: Chapter 6, Section 6.2.2 – Movement Due to Growth

Explanation

The passage explicitly states: "a hormone called auxin, synthesised at the shoot tip, helps cells grow longer… auxin diffuses towards the shady side… the plant appears to bend towards light." This makes B the only correct option. Remember: auxin = shoot tip, moves to shady side = bending towards light.

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