Consider the following components of vascular tissues: (a) Tracheids (b) Vessels (c) Sieve cells (d) Sieve tube elements (e) Companion cells (f) Albuminous cells How many of the above structures are normally present in the complex tissues of a typical gymnosperm?

Step-by-step solution

In gymnosperms, the xylem consists mainly of tracheids, while vessels are generally absent. The phloem of gymnosperms contains sieve cells and albuminous cells, but lacks sieve tube elements and companion cells. Evaluating the given list: (a) Tracheids - Present (b) Vessels - Absent (c) Sieve cells - Present (d) Sieve tube elements - Absent (e) Companion cells - Absent (f) Albuminous cells - Present Thus, exactly three of the listed structures are present in the complex tissues of a typical gymnosperm. Answer: Thre