Which of the following living tissues of plants generally lacks nucleus?

• a. Vessels of xylem
• b. Parenchyma of pith
• c. Cambium of roots
• d. Sieve tubes of the phloem

The living tissues of plants that generally lack a nucleus are primarily found in specific structures. Among the options provided, the correct answer is:

Vessels of Xylem

Xylem vessels are specialized for water transport and are composed of dead cells at maturity, which means they do not contain a nucleus. This adaptation allows for efficient water flow from roots to leaves.

Other Options Explained

• Parenchyma of Pith: This tissue is living and contains a nucleus, playing a role in storage and photosynthesis.
• Cambium of Roots: Cambium is a layer of actively dividing cells that also have nuclei, contributing to growth.
• Sieve Tubes of Phloem: While sieve tubes are involved in transporting nutrients, they do have a modified nucleus.

In summary, xylem vessels are the only option listed that typically lacks a nucleus, making them unique among these plant tissues.