OCR GCSE Biology 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 1090

What role does gibberellin play in plant growth?

Inhibits root growth

Stimulates flower production

Stimulates seed germination and stem growth

Gibberellin is a key plant hormone that plays a significant role in promoting growth and development processes, particularly seed germination and stem elongation. During seed germination, gibberellins help to break down stored starches into sugars, which provide the necessary energy for the growing seedling. Additionally, gibberellins promote cell division and elongation in the stems, leading to increased height and flexibility, which helps the plant to reach sunlight for photosynthesis.

By stimulating both these crucial processes, gibberellins facilitate successful plant growth and adaptation to their environment. Therefore, the role of gibberellin in stimulating seed germination and stem growth is essential for the overall growth and development of the plant.

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Inhibits leaf growth

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