The protoxylem is primary xylem and the metaxylem is secondary xylem.
A: 正确
B: 错误
A: 正确
B: 错误
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 pitch movement is associated with secondary stress, but not with primary stress. A: 正确 B: 错误
- There are two parallel school systems in Britain for primary and secondary education. A: 正确 B: 错误