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Module 3: Exchange and transport
Quick questions on Transport in plants: xylem, cohesion-tension, phloem translocation and xerophytes - OCR A-Level Biology A
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is factors affecting transpiration?Show answer
Transpiration rate rises with anything that steepens the water vapour gradient or speeds diffusion:
What is the mass flow hypothesis of translocation?Show answer
Translocation moves assimilates (sucrose) through the phloem from a source (where they are made or released, for example a photosynthesising leaf) to a sink (where they are used or stored, for example a root or growing tissue):
What are xerophyte adaptations?Show answer
Xerophytes are plants adapted to dry conditions, with features that reduce transpiration:
What is q1?Show answer
Explain why xylem vessels are lignified. [2 marks]
What is q2?Show answer
State two factors that increase the rate of transpiration and explain one of them. [3 marks]
What is q3?Show answer
Name the process by which sucrose is loaded into the phloem at the source. [1 mark]
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