Increase in height adjustment to change in light

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Unformatted text preview: following physiological responses, explain how hormones cause the response in animals. · increase in height · adjustment to change in light · adjustment to lack of water (c) Describe TWO different mechanisms by which hormones cause their effects at the cellular level. Note: Tables only provide examples. They are not inclusive. (a) 4 points maximum (Each bullet 2 points maximum). Activity · Increase in Height Response Stem elongation (meristem) How Hormone Causes Response Lowers pH increasing osmosis Loosens cell wall (cellulose xlinks) · Adjustment to change in light · Adjustment to lack of water Tropism Stomatal closing Flowering Seed germination Shade avoidance Decrease light – increase height Stomates close Root branching Dormancy Disproportionate cell elongation Causes loss of guard cell turgor Phytochrome shift Phytochrome shift Phytochrome shift Disproportionate cell elongation Causes loss of guard cell turgor Differential cell growth Production of dehydration tolerance proteins Copyright © 2003 by College Entrance Examination Board. All rights reserved. Available at apcentral.collegeboard.com. 3 AP® BIOLOGY 2003 SCORING GUIDELINES (Form B) Question 2 (continued) (b) 4 points maximum (Each bullet 2 point maximum) Increase in Height · Adjustment to change in light · Adjustment to lack of water How Hormone Causes Response Stimulates cell proliferation Stimulates liver-->IGF Day/night fluctuations in production Skin Pigmentation Antidiuresis Melanin prod/distribution fluctuations Nephron incr...
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