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托福阅读材料：植物细胞构成

2015-01-22 17:37:45来源：网络

　　托福阅读备考我们需要掌握大量的词汇以及长难句的理解和一些背景材料，如果勤练习真题加上方法技巧，相信大家会有不错的收获。下面是新东方在线托福小编整理的托福阅读材料：植物细胞构成，供同学们参考!

　　The cells of a plant'are organized into three tissue systems: dermal,vascular, and ground tissue. Each tissue system is continuous throughout theplant's body. The specific characteristics of each tissue, however, are different in the different organs ofthe plant.

　　The dermal tissue system is the "skin" of the plant. The dermal system, or epidermis,is a single layer of cells covering the entire body of the plant. The mailn function of the epidermis is to protect the plant. The epidermis also has specialized characteristics for the particular organs it covers. For example, the epidermis ofleaves and stems has a waxy coating that helps the plant conserve water, and the epidermal cells near the tips of the　plant's roots help the plant absorb water and nutrients from the soil.

　　The second tissue system-the vascular system-is the transportation system for water and nutrients. Vascular tissue also helps to support the plant's structure. The third system- the ground tissue-makes up the bulk of a plant, filling all of the spaces between the dermal and vascular tissue systems. Ground tissue functions in photosynthesis, storage, and support.

　　1、How are the three tissue systems of a piant similar to each other?

　　They all continue throughout the plant's body

　　They all have a protective waxy coating.

　　They all consist of a single layer of cells.

　　They all perform the same bodily functions.

　　2、which ofthe following statements best scribes the plant's epidermis?

　　It helps the plant to stand upright

　　It transports water and nutrients.

　　It covers the plant's entire body.

　　It is found only in young plants.

　　3. Which type of tissue does a plant's body mainly consist of?

　　Dermal

　　Vascular

　　Epidermis

　　Ground

　　以上就是新东方在线托福小编整理的托福阅读的相关内容，更多资讯敬请访问新东方在线托福频道，祝大家取得理想的成绩!


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