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GCSE Plant Hormones and Hormonal Coordination in Plants - PDF and Notes

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Aliyah

22/06/2022

Biology

GCSE AQA Biology - Plant Hormones

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Plant hormones

GCSE Plant Hormones and Hormonal Coordination in Plants - PDF and Notes

Plant hormones play a vital role in controlling growth and development in plants through complex hormonal coordination mechanisms. The key plant hormones include auxins, gibberellins, and ethene, which regulate various growth responses including phototropism and gravitropism. These hormones enable plants to respond to environmental stimuli and coordinate their growth patterns effectively.

• Auxins control directional growth responses in both shoots and roots
• Plant hormones and their functions include growth regulation, seed germination, and fruit ripening
• Tropisms are directional growth responses to specific environmental stimuli
• Different plant parts show varying responses to the same stimulus
• Role of auxin in phototropism and geotropism involves differential cell growth

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22/06/2022

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Homeostasis and response

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GCSE Plant Hormones and Hormonal Coordination in Plants - PDF and Notes

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Aliyah

@4liyah

Plant hormones play a vital role in controlling growth and development in plants through complex hormonal coordination mechanisms. The key plant hormones include auxins, gibberellins, and ethene, which regulate various growth responses including phototropism and gravitropism. These hormones enable... Show more

<h2 id="hormonalcoordination">HORMONAL COORDINATION</h2> <h3 id="planthormones">PLANT HORMONES</h3> <p>Plants require hormones to coordinat

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Page 1: Plant Hormones and Growth Responses

The page explores how plants coordinate their growth through hormonal control, particularly focusing on tropisms and specific plant hormones. The content details the mechanisms of auxins, gibberellins, and ethene in controlling plant growth and development.

Definition: Tropisms are directional growth responses of plants to specific environmental stimuli such as light or gravity.

Vocabulary: Auxins are plant growth hormones produced in shoots and roots that control directional growth responses.

Example: During phototropism, auxin accumulates on the shaded side of shoots, causing cells to elongate faster and the shoot to bend towards light.

Highlight: The concentration of auxins produces opposite effects in shoots and roots - stimulating growth in shoots but inhibiting growth in roots.

Quote: "Gibberellins are hormones that are important for starting the germination of seeds."

The page explains how negative geotropism in plants occurs in shoots, while roots exhibit positive geotropism. Similarly, shoots demonstrate positive phototropism while roots show negative phototropism. This differential response helps optimize plant growth and development. The text also includes practical applications, explaining how auxins are used in agriculture and horticulture through their growth-regulating properties.

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