Question

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 phloem

Answer 1

The correct option is D Sieve tubes of phloem

The phloem is the plant tissue involved in the transportation of the food in the form of sucrose. The phloem is composed of sieve tubes, companion cells, phloem parenchyma and fibres. The sieve tubes are the tube-like cells without the nucleus. These cells have lignified cell wall and perforations for the conduction of food. The companion cells are adjacent cells of sieve tube which control the function of sieve cells.