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Difficulty: MediumSpermatophytes: Gymnosperms and Angiosperms

In gymnosperms, the phloem tissue lacks companion cells and instead contains specialized albuminous cells to support sieve cells.

Answer: Answer

Answer

True
The statement is correct because companion cells are absent in gymnosperms, where albuminous cells serve as the metabolic support units for sieve cells.

Step-by-Step Solution

1
Analyze the phloem cellular components of gymnosperms.
Gymnosperms contain primitive sieve cells rather than sieve tube elements and lack companion cells.
Companion cells are ontogenetically and functionally tied to sieve tube elements in angiosperms.
2
Identify the functionally equivalent cells in gymnosperms.
Albuminous cells (Strasburger cells) perform the metabolic support functions for sieve cells in gymnosperms.
Anatomical evolutionary differences distinguish the conducting and supportive tissue elements between gymnosperms and angiosperms.

Key Concept

Phloem cellular organization in Gymnosperms versus Angiosperms
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Topics

Spermatophytes: Gymnosperms and Angiosperms

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