| Text | Sieve tube elements are
also long, tube-like structures, arranged longitudinally and are associated with companion cells. Their end walls are perforated in a sieve-like manner to form the sieve plates. A mature sieve element possesses a peripheral cytoplasm and a large vacuole but lacks a nucleus. The functions of sieve tubes are controlled by the nucleus of companion cells Sieve cells are present in Lower plants rather than Tubes |
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