A-Level Biology Specification

Edexcel B 9BI0

Section 4.7: Transport in plants

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#4.7i

Understand the structure of xylem and phloem tissues in relation to their role in transport.

#4.7ii

Understand how water can be moved through plant cells by the apoplastic and symplastic pathways.

#4.7iii

Understand how the cohesion-tension model explains the transport of water from plant roots to shoots.

#4.7iv

Understand how temperature, light, humidity and movement of air affect the rate of transpiration.

#4.7v

Understand the strengths and weaknesses of the mass-flow hypothesis in explaining the movement of sugars through phloem tissue.