IB Biology Topics 9.1 & 9.2 (HL): Transport in the Xylem and Phloem of Plants

This video starts by reviewing the basic structure of plant stems and roots, including micrographs of both. It then discusses the phloem and its loading via the apoplast and symplast routes. This is followed by the adaptations of the phloem, and how aphids are used to quantify phloem rate. Next it covers the structure of the xylem and how water moves via the transpiration stream. After this, the basics of leaf structure, transpiration and factors of transpiration are introduced, along with the measurement of transpiration rate via a photometer. Finally, the video covers water conservation.

00:00 Introduction
00:41 Plant stems
00:58 Vascular structure
02:26 Micrographs
02:41 Phloem
05:15 Phloem adaptations
05:40 Aphids
06:23 Xylem
07:56 Xylem models
08:39 Root absorption
09:36 Preview finished!

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[Zen-ztuk]

You have no idea how much of clutch this is when my bio mocks are coming up, thanks Teach Tiber

[Dan-dbyt]

you have no idea how much this is saving me, thank you so much

[haya-hu]

On the phloem adaptations part. Instead of the sieve tube cells having a Lot of mitochondrias and folded membrane, Don’t do companion cells actually have this characteristics? In my IB book it says that the companion cells are the ones with mitochondria because of active transport happening in these cells

[mainishizawa]

Do you have the adhesion and cohesion switched? 7:18