PPT-Plant Hormones

Tropisms Uses of plant hormones How do plants always grow the right way up What conditions will affect how a plant grows Plants are very sensitive and their growth is affected by their environmental conditions. continued. Water. Plants require water for growth, temperature regulation, and for support. . Remember . that water is one of the reactants needed for photosynthesis. A plant that does not have sufficient amounts of water will wilt. . Plant Hormones. Plant Hormones. Naturally occurring compounds produced by the plant to accelerate or inhibit the rate of growth or maturation. Produced in minute quantities, but can have a large affect on growth. L2: Hormones. Learning Objectives:. Describe what a hormone is.. Describe the menstrual cycle and the role of hormones.. Explain how hormones play a role in contraceptives and fertility treatments.. Describe the role of plant hormones in plant development.. Plant . hormones . are chemical signals that modify or control one or more specific physiological processes within a plant. © 2011 Pearson Education, Inc.. The Discovery of Plant Hormones. Any response resulting in curvature of organs toward or away from a stimulus is called a . . Growth Retardants. . Synthetic and natural growth retardants are sold under the trade names A-Rest. ®. , B-Nine. ®. , Bonzi. ®. , Sumagic. ®. , Cycocel. ®. , and others.. Used on florist crops such as poinsettia & chrysanthemum.. Plant Hormones. Hormones are chemical signals that coordinate the various parts of an organism. A hormone is a compound produced in one part of the body which is then transported to other parts of the body, where it triggers responses in target cells and tissues. Why? We love plants. 9.3 Growth in plants. Nature . of science: . Developments . in scientific research follow improvements in analysis and deduction—improvements in analytical techniques allowing the detection of trace amounts of substances has led to advances in the understanding of plant hormones and their effect on gene expression. (1.8. Write down two differences between the hormonal system and nervous system . Nervous system – nerve cells pass electrical impulses along their length and stimulate target cells by neurotransmitters. Define plant hormones. Outline some of the effects of plant hormones. Explain some of the observations when carrying out experiments into plant hormones. Give examples of how they are used in food production. Fig. 32-1a, p.540. Impacts, Issues: . . Foolish Seedlings, Gorgeous Grapes. . . Hormones – signaling molecules that stimulate or inhibit gene activity. Gibberellins are a class of plant hormones that stimulate stem lengthening. Lesson . 2. Plant Responses. plant hormones produced by root tips that increase the rate of cell . division. cytokinins. plant hormones produced by root tips that increase the rate of cell . division. Plant Growth and Development. Hormones . diffuse throughout the plant to promote growth and development.. What is a Plant Hormone?. A . naturally-occurring. compound which regulates change in . physiology. Dr. Anju Singh. Assistant Professor . School of Pharmaceutical Sciences. CSJMU, Kanpur. Plant Hormones and Their Applications. Plant hormones or phytohormones are chemicals that regulate plant growth. Plant hormones are signal molecules produced within the plant and occur in extremely low concentrations. Hormones regulate cellular processes in targeted cells locally and then moved to other locations, in other locations of the plant. They affect gene expression and transcription levels, cellular division, and growth. There are five major classes of plant hormones.. Chemicals that are made in one part of an organism, but affect another part of the organism. Allows a plant to respond to some stimulus in the environment. Allows it to bloom at an appropriate time. Allows it to grow toward a light source.