Question

An extinct order of Gymnosperm that includes Paleozoic fossil plant is

• A. Cordtail
• B. Cordaitales
• C. Basidiomycetes
• D. Ascomycetes

Hint:

In biological nomenclature, plant orders systematically end with the suffix "-ales" (e.g., Cordaitales, Ginkgoales).
Fungi classes or phyla typically end in "-mycetes" (e.g., Ascomycetes, Basidiomycetes).
This suffix rule allows for rapid elimination of choices in paleobotanical questions.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Gymnosperms are seed-producing plants without enclosed seeds.
The geological record preserves several extinct lineages of gymnosperms that dominated ancient terrestrial landscapes during the Paleozoic era.

Step 2: Detailed Explanation:
The Cordaitales is an extinct order of primitive, woody gymnosperms that flourished primarily from the Carboniferous to the Permian periods of the Paleozoic era.
These plants were large, monopodial trees, sometimes reaching heights of up to 30 meters, and resembled modern conifers in their growth habit.
They possessed strap-like leaves with parallel venation and produced seed-bearing cones.
The wood of Cordaitales was pycnoxylic (dense), and their fossil remains are major contributors to Carboniferous coal seams.
Analyzing the options:
- "Cordtail" is a non-scientific distractor.
- Basidiomycetes and Ascomycetes are major taxonomic subdivisions (phyla) of fungi, not plants.
Therefore, Cordaitales is the only valid extinct order of Paleozoic gymnosperms among the options.

Step 3: Final Answer:
The extinct Paleozoic gymnosperm order is Cordaitales.