Transport in xyloem expectations
9.1.U1Transpiration is the inevitable consequence of gas exchange in the leaf. 9.1.U2Plants transport water from the roots to the leaves to replace losses from transpiration. 9.1.U3The cohesive property of water and the structure of the xylem vessels allow transport under tension. 9.1.U4The adhesive property of water and evaporation generate tension forces in leaf cell walls. 9.1.U5Active uptake of mineral ions in the roots causes absorption of water by osmosis. 9.1.A1Adaptations of plants in deserts and in saline soils for water conservation. 9.1.A2Models of water transport in xylem using simple apparatus including blotting or filter paper, porous pots and capillary tubing. 9.1.S1Drawing the structure of primary xylem vessels in sections of stems based on microscope images. 9.1.S2Measurement of transpiration rates using potometers. (Practical 7) 9.1.S3Design of an experiment to test hypotheses about the effect of temperature or humidity on transpiration rates. |
Transport in phloem expectations
9.2.U1Plants transport organic compounds from sources to sinks. 9.2.U2Incompressibility of water allows transport along hydrostatic pressure gradients. 9.2.U3Active transport is used to load organic compounds into phloem sieve tubes at the source .9.2.U4High concentrations of solutes in the phloem at the source lead to water uptake by osmosis. 9.2.U5Raised hydrostatic pressure causes the contents of the phloem to flow towards sinks 9.2.A1Structure–function relationships of phloem sieve tubes. 9.2.S1Identification of xylem and phloem in microscope images of stem and root. 9.2.S2Analysis of data from experiments measuring phloem transport rates using aphid stylets and radioactively-labelled carbon dioxide. |
The Making of a Giant Biographic
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These are all old syllabus references
Bio Ninja-------->
Stephen Taylor pdf -----> Click 4 Biology -------> 15 Summary Facts------> and command term ref ---> IB Paper II Q w/ --------> markscheme Crash Course ---->>> |
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