biology 2

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what are the sieve tubes adapted for
adapted for logitudinal flow of materials
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what do seive tubes form
seive elemnts
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how are the sieve plates formed
the end of the tubes dont break down but prefarate pores
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what do cytoplasmic fillamets contain
phloem [riteien extend from sieve tcell to the next through pores in seive plates
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what are sieve tubes connected to
companions cells
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what do companion cells contain
large necleus, lots of mitochindrai and dense cytoplasm
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how are the companions cells conected to seive tubes
by the plasdomata
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what ois the ringing experiment
remove the cylinder in the outer bark, the contents afo the above and below cylinder is annalysed
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aphid experiment
aphid insert stlyet into the sieve tube, the aphid is anethatiseda and the sieve tube is cut off still attched to the sieve tube, the sap is under pressure and the excudes from the tubes and is collected
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radioisotope labelling
radioactive carbon is fixed in the sugar used for photosynthesis, the 'source' leafe and the 'sink' tissues are placed in phtographis film for 2hrs,
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what does the technique show
the technique shows that the sugar is transported in a downward and upward movement
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mass flow theory
massflow is the sugars in the phloem to the leave, its there is a hogher concentration in the leaf (source) and there is a lower concentration in the issue(stem)
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arguments agaisnt the theory
does not explain the existence of the sieve tubes and does anot explain the role of tyhe cpmaanions cells, sucrose and amino acids moce in different directios and at different rates in the same tissse
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what do seive tubes form

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seive elemnts

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how are the sieve plates formed

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Card 4

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what do cytoplasmic fillamets contain

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what are sieve tubes connected to

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