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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. [2] medium thorough-understanding
Both gibberellins and abscisic acid are plant hormones with contrasting roles. Describe the role of each hormone in the plant, and give ONE observable situation in which abscisic acid acts on a plant structure to restrict or slow down a process.
Generated by claude-sonnet-4-6 · 2026-06-26 01:02 · grounding rag
Model Answer

Gibberellins promote growth in plants — they stimulate cell elongation and help in stem elongation, seed germination, and fruit development.

Abscisic acid (ABA) is a growth inhibitor — it inhibits growth and promotes responses such as seed dormancy and wilting.

Observable situation: When a plant is under water stress, abscisic acid causes stomata to close, restricting water loss and slowing transpiration.

Explanation

The question asks for contrasting roles (gibberellin = promoter; ABA = inhibitor) and ONE observable example of ABA restricting a process. Stomatal closure under drought stress is the classic, textbook-expected example. Note: though the source passages do not detail these hormones explicitly, these are standard NCERT Class 10 Science (Chapter 6) facts examiners expect. Award marks are split: ~1 mark for describing both hormones' roles, ~1 mark for the ABA example.

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