Unit 3 Lesson 5 Plant Hormones and Their Effects

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Presentation transcript:

Unit 3 Lesson 5 Plant Hormones and Their Effects 1/17/2019 Unit 3, Lesson 5, Plant Hormones and Their Effects

Functions of Plant Hormones Plant hormones are chemicals that are produced in one part of the plant and transported to another part, where it causes a physiological change. 1/17/2019 Unit 3, Lesson 5, Plant Hormones and Their Effects

Types of Plant Hormones There are four common types of plant hormones: Auxins Gibberellins Cytokinins Ethylene 1/17/2019 Unit 3, Lesson 5, Plant Hormones and Their Effects

Unit 3, Lesson 5, Plant Hormones and Their Effects Description of Auxins With Auxins Auxins promote cell elongation. It weakens the connections between the cellulose fibers in the cell wall, which allow them to stretch and grow longer. Auxins promote stem growth Without Auxins 1/17/2019 Unit 3, Lesson 5, Plant Hormones and Their Effects

Description of Gibberellins Gibberellins also promote cell elongation. Dwarf plants are often “dwarfed” because they cannot produce gibberellins or can’t process it. Fruit farmers use it to enhance fruit formation. 1/17/2019 Unit 3, Lesson 5, Plant Hormones and Their Effects

Description of Cytokinins Cytokinins stimulate cell division (cytokinesis). They produce more proteins by promoting mitosis. Cytokinins are produced in the roots. 1/17/2019 Unit 3, Lesson 5, Plant Hormones and Their Effects

Description of Ethylene Gas Ethylene is a simple, gaseous compound composed of carbon and hydrogen that speeds the ripening of fruit. Ethylene causes the cell walls to become soft and causes the fruit to become sweet. 1/17/2019 Unit 3, Lesson 5, Plant Hormones and Their Effects

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