单被、无被花比两被花(双被花)原始。()

单被、无被花比两被花(双被花)原始。( )A.正确B.错误

查看答案

()花腋生。

花腋生。A.玉兰B.含笑C.鹅掌楸D.木莲

查看答案

蕨的孢子体世代染色体为2n,下列哪些结构是孢子体世代。()

蕨的孢子体世代染色体为2n,下列哪些结构是孢子体世代。( )A.原叶体B.孢子囊C.假根D.颈卵器

查看答案

When you are little, the whole world feels like a big playground. I was living i

When you are little, the whole world feels like a big playground. I was living in Conyers, Georgia th

查看答案

芸香科植物均为柑果。()

芸香科植物均为柑果。( )A.正确B.错误

查看答案