OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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Study for the OCR GCSE Biology Exam. Use multiple choice questions and quiz flashcards with explanations and hints. Excel in your exams!

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What role does gibberellin play in plant growth?

Inhibits root growth
Stimulates flower production
Stimulates seed germination and stem growth
Inhibits leaf growth

The correct answer is: 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.