Homeostasis & ResponseKey Facts

Commercial Uses of Plant Hormones

Part of Plant Hormones — GCSE Biology

This key facts covers Commercial Uses of Plant Hormones within Plant Hormones for GCSE Biology. Topic 11: Plant Hormones It is section 3 of 12 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 3 of 12

Practice

15 questions

Recall

20 flashcards

📌 Commercial Uses of Plant Hormones

Auxins: Weed killers (make weeds grow too fast), rooting powder
Ethene: Ripens fruit (bananas picked green, ripened with ethene)
Gibberellins: Promote seed germination, increase fruit size

Visual: Plant Hormones & Tropisms

Plant hormones diagram showing phototropism (response to light), gravitropism (response to gravity), how auxin controls growth in shoots and roots, and commercial uses of auxins, ethene, gibberellins and cytokinins.

Remember: Auxin in SHOOTS: more = more growth | Auxin in ROOTS: more = less growth | This explains tropisms!

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 How It Works: Auxin and Phototropism Tropisms — Plant Responses to Stimuli Required Practical 8: Investigating Plant Responses

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).

15 questions on Plant Hormones — practise free

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Auxin — How It Works

How It Works: Auxin and Phototropism