木质素组织包括厚壁组织和木质部。
厚角组织及厚壁组织为植物的支持组织。
Question 16. Collenchyma and sclerenchyma are plant support tissues.
为厚壁组织中除纤维外的所有细胞种类。
厚壁组织细胞是一种常见的支持细胞类型。
Sclerenchyma cells are a more common type of supporting cell.
厚壁组织由两种形式截然不同的细胞组成：较长的纤维和较短的石细胞。
Sclerenchyma is often found associated with vascular tissue and exists as two distinct types of cell: the long FIBER and the shorter SCLEREID.
它们的内部结构是由气道、不同大小的维管束、基本组织以及厚壁组织组成。
Their internal structures consist of air passages, vascular bundles of various size, ground tissues and sclerenchyma.
不同部位的木质化的程度不同，原生木质部中只有轻微的加厚，而在厚壁组织和一些木质部导管中则进一步加厚，平均含25%-30%的木质素和50%的纤维素。
The degree of lignification varies from slight in protoxylem to heavy in sclerenchyma and some xylem vessels, but values of 25-30% lignin and 50% cellulose are average.
不同部位的木质化的程度不同，原生木质部中只有轻微的加厚，而在厚壁组织和一些木质部导管中则进一步加厚，平均含25%-30%的木质素和50%的纤维素。
The degree of lignification varies from slight in protoxylem to heavy in sclerenchyma and some xylem vessels, but values of 25-30% lignin and 50% cellulose are average.
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