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Growing in the Dark

Plants grow more quickly in the dark. The plants grow rapidly in order to reach the light. It is thought that gibberellins are responsible for cell elongation at the internodes.Rhubarb is sometimes grown in the dark. The plants become etiolated (thin with little chlorophyll) due to rapid growth.

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Specification: OCR Biology A (H420), A-level, 5.1.5 Plant and animal responses. Topic: Plant Responses.

Key terms in this lesson

Gibberellin
A plant hormone that stimulates stem elongation and the breaking of seed dormancy and germination.
Chlorophyll
The main photosynthetic pigment, which absorbs light energy, exciting electrons that are used in the light-dependent reactions.

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