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Unformatted text preview: es responsible for its production are the vascular cambium tissue and the secondary vascular tissue. secondary growth = growth in width ONLY (not length) 16. By increasing cell number, cell division in meristems increases the potential for growth. However, it is cell expansion (particularly cell elongation) that accounts for the increase in size. cell division in meristems increases potential for growth when you increase cell number 17. The plane in which a plant cell divides is determined during late interphase. late interphase determines where plant cell divides 18. The orientation of cellulose microfibrils in a plant wall can control the direction of cell expansion because they do not stretch, so the cell expands mainly perpendicular to the “grain” of the microfibrils. cellulose microfibrils expand perpendicular to grain of microfibrils 19. The significant way in that plant developmental phases differ from those observed with animals are that plants developmental phases occur within a single region, the shoot apical meristem. The morphological changes that arise from these transitions in shoot apical meristem activity are called phase changes. plants developmental phases occur ONLY in the shoot apical meristem 20. Organ Identity Gene is a plant homeotic gene that uses positional information to determine which emerging leaves develop into which types of floral organs. The ABC model of flower formation explains the formation of the four types of floral organs by: A gene activity = sepals A+B gene activity = petals B+C gene activity = stamens C gene activity = carpels *Be able to recognize mutant floral patterns Chapter 36: Resource Acquisition and Transportation in Petals 1. C otransport - the coupling of the “downhill” diffusion of one substance to the “uphill” transport of another against its own concentration gradient O smosis - the diffusion of water across a selectively permeable membrane S olute potential - a component of water potential that is proportional to the molarity of a solution and that measures the effects of solutes on the direction of water movement; also called osmotic potential, can be either zero or negative P ressure potential - A component of water potential that consists of the physical pressure on a solution, which can be positive, zero, or negative T urgor pressure - the force directed against a plant cell wall after the influx of w...
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This document was uploaded on 03/02/2014 for the course BIO 109 at University of Missouri-Kansas City .

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