PLANT HORMONES

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What are plant hormones?

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Plant hormones, also known as phytohormones, are chemical substances produced in plants that regulate growth, development, and responses to environmental stimuli.

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What is auxin?

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Auxin is a type of plant hormone that promotes cell elongation, root formation, and is involved in regulating plant responses to light and gravity.

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What is phototropism?

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Phototropism is the growth of a plant in response to light direction, where plants bend towards the light source.

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What is thigmonasty?

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Thigmonasty is a plant's response to touch or mechanical stimulation, resulting in movement, such as the closing of a Mimosa plant's leaves when touched.

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What is seismonasty?

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Seismonasty is a non-directional response of plants to mechanical stimuli, such as shaking or vibrations, often seen in plants like Mimosa pudica.

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What is phototaxis?

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Phototaxis is the movement of organisms, such as Euglena, towards or away from light, typically seen in unicellular organisms.

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What is the role of gibberellins?

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Gibberellins are plant hormones that promote stem elongation, seed germination, and flowering.

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What is the difference between tropism and nastic movements?

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Tropism is a directional growth response to stimuli (e.g., light, gravity), while nastic movements are non-directional responses (e.g., closing of leaves) to stimuli.

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What is abscisic acid?

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Abscisic acid is a plant hormone that helps regulate water loss, promotes seed dormancy, and plays a role in stress responses.

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What is the function of cytokinins?

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Cytokinins are plant hormones that promote cell division, shoot formation, and delay leaf senescence.