Xylem and Phloem - AS Biology Revision - OCR (Unit 1.2.3)
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Lignin is also for waterproofing
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@anon3339 Thank you. This video really helped aswell..please do some more
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@debby101 Florence and the machine- dog days are over
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What is this song called?
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Thanks, that was very useful,!
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thank you very much that was very useful! :)
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its good except it goes to fast..
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thank you so much :)
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Will you sit my exam tomorrow?
Thank you kind sir x
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Dont you mean plants have a large sa : vol ratio instead of small?????
jalalpurjattan 1 year ago
@jalalpurjattan nope, plants have a small surface area to volume ratio!
OCRBiologyAS 1 year ago
@jalalpurjattan Plants dont need a transport system for oxygen and co2 because their matabolism is lower, sa to vol ratio is large and diffusion thorugh air spaces and cells suffice!!
jalalpurjattan 1 year ago
@jalalpurjattan From the OCR textbook: "there are many cells inside the plant that are not near the surface of the plant which need a transport system to provide it with water and nutrients to survive".
Also, "Once a multicellular organisms becomes larger, its surface-area-to-volume ratio becomes smaller and its cells needs more supplies".
OCRBiologyAS 1 year ago