The protoxylem is primary xylem and the metaxylem is secondary xylem.
The protoxylem is primary xylem and the metaxylem is secondary xylem.
The protoxylem is primary xylem and the metaxylem is secondary xylem. A: 正确 B: 错误
The protoxylem is primary xylem and the metaxylem is secondary xylem. A: 正确 B: 错误
Which one is not a complex tissue? A: Xylem B: Phloem C: Vascular tissue D: Vessel
Which one is not a complex tissue? A: Xylem B: Phloem C: Vascular tissue D: Vessel
In the secondary structure of roots, xylem rays and phloem rays belong to ( ). A: Secondary rays B: Vascular rays C: Pith rays
In the secondary structure of roots, xylem rays and phloem rays belong to ( ). A: Secondary rays B: Vascular rays C: Pith rays
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