EASY REVISION AQA A-Level Biology 3.3.4.2 Mass transport in plants

This episode focuses on topic 3.3.4.2 (Mass transport in plants) of the AQA A Level Biology specification. I cover the phloem and xylem and how the cohesion-tension theory and mass flow hypothesis work. I will cover the factors affecting transpiration rate and look at evidence for and against the mass flow hypothesis.

00:00 Introduction
0:11 specification overview
0:56 introduction to phloem and xylem
01:26 xylem & cohesion-tension theory
03:15 factors affecting transpiration
05:04 investigating transpiration
06:34 phloem & translocation
09:10 evidence for mass flow hypothesis
10:49 evidence against mass flow hypothesis
11:16 specification round-up

[gloria]

When do you think you’ll have control of gene expression uploaded ?