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Plant Biology & Photosynthesis

Plant Biology & Photosynthesis. 9.1 Transport in the xylem of plants 9.2 Transport in the phloem of plants 2.9 & 8.3 Photosynthesis 9.3 Growth in plants 9.4 Reproduction in plants. Transport in the xylem of plants.

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Plant Biology & Photosynthesis

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  1. Plant Biology & Photosynthesis • 9.1 Transport in the xylem of plants • 9.2 Transport in the phloem of plants • 2.9 & 8.3 Photosynthesis • 9.3 Growth in plants • 9.4 Reproduction in plants

  2. Transport in the xylem of plants • Essential idea: Structure and function are correlated in the xylem of plants.

  3. Transport in the xylem of plants • Skill: Drawing the structure of primary xylem vessels in sections of stems based on microscope images.

  4. Transport in the xylem of plants • Transpiration is the inevitable consequence of gas exchange in the leaf. • Plants transport water from the roots to the leaves to replace losses from transpiration.

  5. Transport in the xylem of plants • The cohesive property of water and the structure of the xylem vessels allow transport under tension.

  6. Lignified xylem

  7. Transport in the xylem of plants • The adhesive property of water and evaporation generate tension forces in leaf cell walls. • Application: Models of water transport in xylem using simple apparatus including blotting or filter paper, porous pots and capillary tubing.

  8. Transport in the xylem of plants • Skill: Measurement of transpiration rates using potometers. (PP7) • Skill: Design of an experiment to test hypotheses about the effect of temperature or humidity on transpiration rates.

  9. Transport in the xylem of plants • Active uptake of mineral ions in the roots causes absorption of water by osmosis.

  10. Transport in the xylem of plants • Application: Adaptations of plants in deserts and in saline soils for water conservation.

  11. Xerophytic adaptations

  12. Sorghum Stonecrop

  13. Transport in the phloem of plants • Essential idea: Structure and function are correlated in the phloem of plants.

  14. Transport in the phloem of plants • Skill: Identification of xylem and phloem in microscope images of stem and root.

  15. Transport in the phloem of plants • Plants transport organic compounds from sources to sinks. • Incompressibility of water allows transport along hydrostatic pressure gradients.

  16. Transport in the phloem of plants • Active transport is used to load organic compounds into phloem sieve tubes at the source. • Application: Structure–function relationships of phloem sieve tubes.

  17. Transport in the phloem of plants • High concentrations of solutes in the phloem at the source lead to water uptake by osmosis. • Raised hydrostatic pressure causes the contents of the phloem to flow towards sinks.

  18. Transport in the phloem of plants • Skill: Analysis of data from experiments measuring phloem transport rates using aphid stylets and radioactively-labelled carbon dioxide.

  19. Photosynthesis • Essential idea: Light energy is converted into chemical energy.

  20. Photosynthesis

  21. Growth in plants • Essential idea: Plants adapt their growth to environmental conditions.

  22. Growth in plants

  23. Reproduction in plants • Essential idea: Reproduction in flowering plants is influenced by the biotic and abiotic environment.

  24. Reproduction in plants

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