第三单元 第二章 第二节 植株的生长 Flashcards

1
Q

根尖的结构及各部分的作用

A

①根冠:保护根尖;
②分生区:不断分裂产生新细胞,补充根冠和伸长区细胞,是分生组织;
③伸长区:根生长最快的部位,细胞伸长成为成熟区细胞;
④成熟区:长有大量根毛,是根尖吸收水和无机盐的主要部位。

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2
Q

幼根的生长的原因

A

一方面要靠分生区细胞的分裂增加细胞的数量;另一方面靠伸长区细胞体积的增大。所以,根的生长和分生区 以及伸长区有关。

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3
Q

植物茎加粗生长的原因

A

形成层细胞分裂和分化的结果

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4
Q

芽发育成枝条的原因

A

芽顶端有大量的分生组织

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5
Q

幼叶发育成?

A

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6
Q

芽轴发育成?

A

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7
Q

芽原基发育成?

A

侧芽

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8
Q

植株生长需要的主要营养物质有哪几类?

A

水、无机盐(如氮、磷、钾等)、有机物(叶片通过光合作用制造)

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