, Lesson objectives
Explain the mechanism of translocation using
the mass flow hypothesis.
, Success criteria
• Identify xylem and phloem from transverse section
of angiosperm stem and describe their functions.
• Explain mechanism of translocation in the phloem
between source and sink.
• Distinguish between source and sink
• Explain mass flow hypothesis and evidences that
support it.
• Describe evidences against mass flow hypothesis.
, Terminology
English
• Angiosperm
• Cambium
• Sieve tube elements
• Companion cells
• Source
• Sink
• Translocation
• Phloem loading
• Phloem unloading
• Mass flow