structureorganization213-page3

structureorganization213-page3 - • Plants respond...

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Plant Structure and Organization - 3 Regulation As with animals, hormones (regulatory chemicals) control much of plant metabolism. In addition, environmental cues such as light, touch and gravity are important to plant growth and development. Response to Stimuli Living organisms respond to stimuli, both external and internal. Some plants close their leaves when they are touched; others track the sun's path. Wound tissue forms when branches are broken from trees and chemical signals are relayed from one area of a plant to other areas in response to stimuli. For example: Stomata open and close in response to water stress.
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Unformatted text preview: • Plants respond structurally to conditions of their environment. • Tree ring analysis reveals both past and current climate information. • Trees grow directionally in response to wind. Defense Plants may have more need to defend against potential predators and competitors than many animals. Most plants lack motility and are fixed in space once germinated. They have evolved a delightful array of physiological (secondary metabolite) defenses as well as structural defenses to deter potential predators....
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