问题
选择题
一粒种子能够生长成一棵大树，从种子结构来说，主要是由于种子内有（ ）
A．有种皮保护
B．胚根扎根于土中
C．子叶中有营养物质
D．有完整的胚
答案
答案：D
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一粒种子能够生长成一棵大树，从种子结构来说，主要是由于种子内有（ ）
A．有种皮保护
B．胚根扎根于土中
C．子叶中有营养物质
D．有完整的胚
答案：D
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