Homeostasis & ResponseDeep Dive

Tropisms — Plant Responses to Stimuli

Part of Plant Hormones — GCSE Biology

This deep dive covers Tropisms — Plant Responses to Stimuli within Plant Hormones for GCSE Biology. Topic 11: Plant Hormones It is section 1 of 12 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 1 of 12

Practice

15 questions

Recall

20 flashcards

🌱 Tropisms — Plant Responses to Stimuli

Plants respond to stimuli but more slowly than animals:

Tropism	Response to	Example
Phototropism	Light	Shoots grow towards light (positive)
Geotropism/Gravitropism	Gravity	Roots grow down (positive); shoots grow up (negative)

Keep building this topic

Read this section alongside the surrounding pages in Plant Hormones. That gives you the full topic sequence instead of a single isolated revision point.

Auxin — How It Works Commercial Uses of Plant Hormones How It Works: Auxin and Phototropism

Practice Questions for Plant Hormones

When a plant shoot is lit from one side, where does auxin accumulate?

A. On the side facing the light
B. Equally on both sides
C. On the shaded side, away from the light
D. At the base of the shoot

1 markfoundation

Explain how auxin causes gravitropism (geotropism) in plant roots.

3 marksstandard

Quick Recall Flashcards

What is phototropism?

Phototropism is the growth response of a plant to light. Shoots show positive phototropism — they grow towards the light source.

What is gravitropism?

Gravitropism is the growth response of a plant to gravity. Roots show positive gravitropism (grow downward, towards gravity). Shoots show negative gravitropism (grow upward, away from gravity).

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Plant Hormones

Auxin — How It Works