Sieve tube elements, associated with companion cells, are longitudinally arranged with perforated end walls forming sieve plates; they lack a nucleus and their function is controlled by companion cells. Sieve cells are found in lower plants instead of sieve tubes.
Sieve tube elements are<br>also long, tube-like structures, arranged {{c1::longitudinally}} and are<br>associated with {{c1::companion cells}}. Their end walls are {{c2::perforated}} in a<br>sieve-like manner to form the {{c1::sieve plates}}. A mature sieve element<br>possesses a {{c3::peripheral}} cytoplasm and a large vacuole but lacks a {{c3::nucleus}}.<br>The functions of sieve tubes are controlled by the nucleus of companion<br>cells<br><br>{{c1::Sieve cells}} are present in Lower plants rather than {{c1::Tubes}}
| 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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Tags: neet-biology::unit-2::anatomy-of-flowering-plants
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