Question

Sieve tubes are characterized by

• A. Absence of septa
• B. Simple oblique septa
• C. Performed longitudinal walls
• D. Perforated oblique septa

Answer 1

The correct option is D Perforated oblique septa

Sieve tube members are tubular, placed in long series and have specialized sieve areas called as sieve plates occurring at end walls. These sieve plates are often inclined obliquely. Sieve areas can be seen on lateral walls of sieve tube members. In sieve plate, sieve areas, having large pores are seen.
Thus, the correct answer is option D.