Thursday, September 22, 2022
问题:下列重要经济作物、果树各属哪个科:油茶:(),油菜:()。...
Thursday, September 15, 2022
Thursday, September 15, 2022
问题:无限花序中花的开放顺序是()或();而有序花限中花的开放顺序是()或()。...
Thursday, September 22, 2022
Thursday, September 15, 2022
Thursday, September 15, 2022
Thursday, September 15, 2022
Thursday, September 22, 2022
问题:根维管形成层首先起始于()。A、初生韧皮部内方的薄壁细胞B、初生木质部辐射角处的中柱鞘细胞C、初生韧皮部外方的薄壁细胞D、初生木质部细胞...
Thursday, September 22, 2022
问题:如果在郊区存在较大面积的森林植被,有利于促进城市与郊区之间的空气...
Thursday, September 15, 2022
问题:试从藻类植物光合色素的种类、贮藏物质的类别、鞭毛的有无与类型等三个方面,简述各门藻类的亲缘关系和演化关系?...
Thursday, September 22, 2022
Thursday, September 22, 2022
Thursday, September 22, 2022
问题:菊科植物的头状花序,在虫媒传粉适应的意义上,相当于一朵花。...
Thursday, September 15, 2022
问题:水仙的形态特征描述正确的有()A、鳞茎卵球形B、叶狭长带状C、伞房花序顶生D、花白色,芳香...
Thursday, September 22, 2022
Thursday, September 15, 2022
Thursday, September 15, 2022
Thursday, September 15, 2022
Thursday, September 22, 2022
问题:根据子房与花托结合的程度,子房的位置可分为()、()和()三类。...
Sunday, May 14, 2023