Essential idea: Structure and function are correlated in the phloem of plants.
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The tendency of water to flow across a semipermeable membrane from the area of low solute concentration to the area of higher concentration is termed. Mark cuban. Osmotic pressure Like vasopressinconstricts the blood vessels, compensating for the drop in blood pressure. The Well Control System or the Blowout Prevention System on a drilling rig is the system that prevents the uncontrolled, catastrophic release of high-pressure fluids (oil, gas, or salt water) from subsurface formations. Dnd calculate damage. These uncontrolled releases of formation fluids are referred to as Blowouts.Due to the explosive nature of oil and gas, any spark on the surface can result in the ignition of.
The lower power scanning electron micrograph images above show the sieve end plates found on phloem sieve tubes. These perforated walls (in combination with the reduced cytoplasm in sieve cells) gives sieve cells a low resistance to the flow of sap enabling efficient translocation of substances, e.g. sucrose throughout the plant.
Understandings, applications and skills
| 9.2.U1 | Plants transport organic compounds from sources to sinks. |
| 9.2.U2 | Incompressibility of water allows transport along hydrostatic pressure gradients. |
| 9.2.U3 | Active transport is used to load organic compounds into phloem sieve tubes at the source. |
| 9.2.U4 | High concentrations of solutes in the phloem at the source lead to water uptake by osmosis. |
| 9.2.U5 | Raised hydrostatic pressure causes the contents of the phloem to flow towards sinks. |
| 9.2.A1 | Structure–function relationships of phloem sieve tubes. |
| 9.2.S1 | Identification of xylem and phloem in microscope images of stem and root. |
| 9.2.S2 | Analysis of data from experiments measuring phloem transport rates using aphid stylets and radioactively-labelled carbon dioxide. |
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Presentation and NotesThe presentation is designed to help your understanding. The notes outline is intended to be used as a framework for the development of student notes to aid revision.
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Nature of science
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Developments in scientific research follow improvements in apparatus—experimental methods for measuring phloem transport rates using aphid stylets and radioactively-labelled carbon dioxide were only possible when radioisotopes became available. (1.8)