GCSE Biology - Transpiration & Translocation

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*** WHAT'S COVERED ***
1. Mass Transport Systems in Plants
* Introduction to translocation (sugar transport) and transpiration (water transport).
2. Translocation via Phloem
* How sugars made during photosynthesis are transported.
* Structure of phloem cells and tubes (including sieve plates).
* Movement of cell sap (sugar and water mixture).
* Uses of transported sugars (energy and storage).
* Bidirectional nature of phloem transport.
3. Water and Mineral Transport via Xylem
* Structure of xylem tubes (dead cells, lignin reinforcement).
* Transport pathway from roots to leaves.
4. Transpiration Process
* Evaporation of water from leaves via stomata.
* Explanation of the transpiration stream mechanism.
5. Factors Affecting Transpiration Rate
* Influence of light intensity.
* Influence of temperature.
* Influence of air flow (wind).
* Influence of humidity.
* Role of water concentration gradients.

*** CHAPTERS ***
0:00 Introduction to Mass Transport Systems
0:11 Translocation (Sugar Transport)
0:36 Phloem Structure and Function
1:26 Xylem Structure and Function
1:55 Transpiration and the Transpiration Stream
2:47 Factors Affecting Transpiration Rate
2:59 Light Intensity
3:26 Temperature
3:39 Air Flow and Humidity

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