7-2 Formation and Structure of Xylem Vessels (Cambridge AS A Level Biology, 9700)
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- เผยแพร่เมื่อ 9 ก.พ. 2025
- Please note that ADAPTATIONS of Xylem Vessels are NOT covered in this video.
We are just focusing on the structure of the xylem vessels, here.
keywords:
Lignified walls (walls covered with lignin)
Pits (portions of the xylem vessels that aren't lignified, covered with cellulose )
Video on the Plasmodesmata
• 1-9 Organelles in a ty...
Excellent explanation sir! Have not watched anything better than this yet. Nailed it! Hope to see more of such apt and perfect videos.
Thank you.
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the plan is to cover everything from AS to A2. I'm glad you're excited for it. Good luck!
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From where lignin is come in vessel ?
Sir 4:34 does the lignin form in the cell wall or around the cell wall…
@@O901s around the cell wall
Pls continue creating such contet
Excellent....Sir I have a query. If the arrangement of vascular bundle in roots is radial and to that of stem it is arranged in the form of ring....then, how do the root vascular bundle and stem vascular bundle form a continuous tube. Aso there are more number of vascular bundles in stem compared to that of root, then how common tube is formed....
Sir waiting eagerly for reply
the root just isn't a single entity of its own, as it has many branches. It might help to think that each vascular bundle in the stem is connected to a main root extension instead.
Thank you so much sir
Please continue this content
Respected sir,
Query 1- Do xylem vessels have perforated end walls as found in the seive tubes of phloem?
Query 2- How does water get into the tracheids of xylem if they have lignified walls and pits, and no perforations?
Praying for your good health.
Thank you sir.
Query 1: nope, no perforated end walls.
Query 2: so, tracheids are a little bit annoying. For the purpose of A levels, we focus only on dicotyledon plants (monocots are ignored).
In dicots, the tracheids are fully closed and therefore have no water in them. But in monocots, the tracheids actually help conduct water because they have holes at the ends of the tapering.
@@OtterBioTutor Thank you so much sir. Blessed to have a great teacher like you,
Nice drawings!
Special ultra class video
Sir, please explain tracheids, xylem fibre and xylem parenchyma.
Thank you.
Tracheids are just elongated dead cells
Xylem fibres are just sclerenchyma cells providing support
xylem parenchyma are living cells that helps store water and minerals.
@@OtterBioTutor Thank you sir. Huge respect.
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after chapter 11 yeah
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