write 5 points about sievetubes and companion cells
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SIEVE TUBES
- They are slender,tube like structure..
- They are composed of elongated thin walled cells places end to end...
- Walls of sieve tubes are perforated...
- Their nucleus degenerates at maturity...
- Cutoplasm persist in mature cells...
COMPANION CELLS
- They are found within the phloem of flowering plants...
- Usually clesely associated with a sieve element...
- Takes part in loading and unloading sugar into the sieve element..
- They contain mitochondria
- Regulate the activity of the adjacent elements ..
Hope it helps...!!!
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