ZIMSEC A-Level Biology
8.7.1Structure and mechanisms of transport systems in plants
Structure and mechanisms of transport systems in plants in ZIMSEC A-Level Biology: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic83 practice questions4 lessons
Learning objectives
What the syllabus expects you to be able to do.
- 8.7.1.1Describe the structures of xylem vessels, sieve tube elements and companion cells (in monocotyledonous and dicotyledonous roots and stems).
- 8.7.1.2Explain how xylem vessels and phloem tubes are adapted to their functions.
- 8.7.1.3Describe, naming the pathways (apoplast, symplast, vacuolar) and the role of the Casparian strip, how water moves from the soil to the xylem.
- 8.7.1.4Explain the mechanisms that move water from soil to xylem and from roots to leaves (osmosis, root pressure, transpiration pull, capillarity).
- 8.7.1.5Explain the translocation of sucrose (mass flow hypothesis).
Lessons
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Translocation: moving assimilates through the phloem
35 min
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Transpiration, the potometer and the cohesion-tension mechanism
40 min
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Water uptake: from the soil to the root xylem
30 min
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Xylem and phloem: structure, distribution and plan diagrams
35 min
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Sample question
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