Question

A vesselless piece of stem possessing prominent sieve tubes would belong to

• A. Grass
• B. Trochodendron
• C. Pinus
• D. Eucalyptus

Answer 1

The correct option is B Trochodendron

Xylem vessels

• Xylem vessel is one of the important tissues of the xylem.
• It consists of many cells forming a long cylindrical tube-like structure, having a central cavity and pits in it.
• The presence of xylem vessels is the characteristic feature of angiosperms.
• Gymnosperms and primitive angiosperms do not have xylem vessels.

Among the four given options, Trochodendron is a primitive angiosperm that lacks xylem vessels but they have prominent sieve tubes. Eucalyptus, Grass belong to angiosperms. They possess xylem vessels. Pinus is a gymnosperm that lacks xylem vessels and prominent sieve tubes.

Final answer: Option d. Trochodendron.