托福阅读练习--植物细胞组成
发布：深圳环球雅思英语学校 点击数： 发布时间：2014-3-18 15:02:09
摘要: 深圳环球雅思小编为大家带来托福阅读练习--植物细胞组成，考生可以借鉴参考一下，以下是具体内容： thecellsofaplantareorganizedintothreetissuesystems:dermal,vascular,andg
深圳环球雅思小编为大家带来托福阅读练习--植物细胞组成，考生可以借鉴参考一下，以下是具体内容：
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
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