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Xylem sap differs from phloem sap because it is

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Unformatted text preview: stomata from uptake & loss of K ions by guard cells 13. Light stimulates guard cells to accumulate K+ and become turgid (triggered by illumination of blue light receptors in plasma membrane of guard cells). Stoma also open in response to depletion of CO2 within leaves air spaces. The internal “clock” in the guard cell ensures daily rhythm of opening and closing. stoma open from light stimulation accumulating K+ & becoming turgid & from depletion of CO2 14. The effect of water deficiency on stomata is that it causes stomata to close during daytime by loss of turgor. stomata need water or will close from loss of turgor 15. Xylem sap differs from phloem sap because it is unidirectional while phloem sap moves from sites of sugar production to sites of sugar use or storage. xylem sap= unidirectional phloem sap= moves from sites of sugar production to sites of sugar use or storage 16. Sucrose uptake into the phloem at the leaves usually requires an active transport because: 17. The sap flow through a sieve tube differs from that of a sap flow through a: *Be able to use water potential equation for determining movement of water in a defined system, i.e. between a plant cell and its aqueous environment (Ψ= Ψs + Ψp ) • Measured in units of pressure called megapascals (MPa) --1 MPa = 10 atmospheres • Ψs proportional to number of dissolved solutes; always negative • Addition of water soultes reduces water potential • Physical pressure increases water potential/Neg pressure decreases Chapter 38: Angiosperm Reproduction 1. C omplete flower - a flower that has all four basic floral organs; sepals, petals, stamens, and carpels I ncomplete flower - a flower in which one or more of the four basic floral organs are either absent or nonfunctional I nflorescence - a group of flowers tightly clustered together M icropyle - a pore in the integument of an ovule I ntegument - layer of sporophyte tissue that contributes to the structure of an ovule of a seed plant 2. The dominant generation of an ang...
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