| X-chromosome |
| One of the sex chromosomes. |
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| x-ray diffraction |
| Technique utilized to study atomic structure of crystalline substances by noting the patterns produced by x-rays shot through the crystal. |
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| xerophytic leaves |
| The leaves of plants that grow under arid conditions with low levels of soil and water. Usually characterized by water-conserving features such as thick cuticle and sunken stomatal pits. |
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| xylem |
| Tissue in the vascular system of plants that moves water and dissolved nutrients from the roots to the leaves; composed of various cell types including tracheids and vessel elements. Plant tissue type that conducts water and nutrients from the roots to the leaves. |
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