| 释义 |
Definition of sieve cell in English: sieve cellnoun Botany A sieve element of a primitive type present in ferns and gymnosperms, with narrow pores and no sieve plate. Example sentencesExamples - Vessel elements, tracheids, fibres, sieve tube elements, sieve cells, and parenchyma cells are the major components of vascular tissue.
- Sieve tube members occur in angiosperms, while sieve cells are found in other vascular plants.
- These are the sieve cells, through which the nutrients are transported, and the companion cells.
- When coupled with a thick layer of cuticle or bark, the self-sealing mechanisms of sieve cells apparently protect phloem sap from most herbivores.
- Sieve tubes and sieve cells both lose their nuclei when they become functional as conduits for photosynthates.
Definition of sieve cell in US English: sieve cellnoun Botany A sieve element of a primitive type present in ferns and gymnosperms, with narrow pores and no sieve plate. Example sentencesExamples - Vessel elements, tracheids, fibres, sieve tube elements, sieve cells, and parenchyma cells are the major components of vascular tissue.
- When coupled with a thick layer of cuticle or bark, the self-sealing mechanisms of sieve cells apparently protect phloem sap from most herbivores.
- Sieve tube members occur in angiosperms, while sieve cells are found in other vascular plants.
- These are the sieve cells, through which the nutrients are transported, and the companion cells.
- Sieve tubes and sieve cells both lose their nuclei when they become functional as conduits for photosynthates.
|