GCSE Biology - Transpiration & Translocation

⭐️ https://www.cognito.org/ ⭐️

** 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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