The protoxylem is primary xylem and the metaxylem is secondary xylem.
举一反三
- The protoxylem is primary xylem and the metaxylem is secondary xylem. A: 正确 B: 错误
- In the secondary structure of roots, xylem rays and phloem rays belong to ( ). A: Secondary rays B: Vascular rays C: Pith rays
- Which one is not a complex tissue? A: Xylem B: Phloem C: Vascular tissue D: Vessel
- The sequence of rape flower bud differentiation is A: A. Main stem, primary branch, secondary branch B: B, primary branch, secondary branch, main stem C: C. Secondary branching, primary branching, main stem D: D, simultaneous differentiation
- Primary and secondary education system in the UK is compulsory.( )