Unit 3 Lesson 5 Plant Hormones and Their Effects

Unit 3 Lesson 5 Plant Hormones and Their Effects

Unit 3 Lesson 5 Plant Hormones and Their Effects 02/02/20 Unit 3, Lesson 5, Plant Hormones and Their Effects 1 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. 02/02/20 Unit 3, Lesson 5, Plant Hormones and Their Effects 2 Types of Plant Hormones There are four common types of plant hormones: Auxins Gibberellins Cytokinins Ethylene

02/02/20 Unit 3, Lesson 5, Plant Hormones and Their Effects 3 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 02/02/20 Without Auxins Unit 3, Lesson 5, Plant Hormones and Their Effects 4 Description of Gibberellins Gibberellins also promote cell elongation. Dwarf plants are often

dwarfed because they cannot produce gibberellins or cant process it. Fruit farmers use it to enhance fruit formation. 02/02/20 Unit 3, Lesson 5, Plant Hormones and Their Effects 5 Description of Cytokinins Cytokinins stimulate cell division (cytokinesis).

They produce more proteins by promoting mitosis. Cytokinins are produced in the roots. 02/02/20 Unit 3, Lesson 5, Plant Hormones and Their Effects 6 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. 02/02/20 Unit 3, Lesson 5, Plant Hormones and Their Effects 7

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