JAMB 2015 Biology · Question 1
Angiosperms belong to the class
Options
- A.bryophyte
- B.pteridophyta
- C.spermatophyte
- D.thallophytic
Answer: C. spermatophyte
Explanation written with AI and checked against the answer key
Step 1: Analyze the question The question asks which major plant group (the JAMB option calls it a "class") angiosperms belong to. Angiosperms are flowering plants.
Step 2: Explain the concept Plants are classified into major groups based on structure and how they reproduce:
- Thallophyta: simple plants with no true root, stem or leaves (algae, fungi in old classification)
- Bryophyta: mosses and liverworts. They have no vascular tissue and reproduce by spores.
- Pteridophyta: ferns. They have vascular tissue and reproduce by spores, with no seeds.
- Spermatophyta: seed-bearing plants. This group has two subdivisions: • Gymnosperms: naked seeds (e.g. pine) • Angiosperms: flowering plants whose seeds are enclosed in fruits (e.g. mango, beans, maize, hibiscus)
Step 3: Work through the options
- A. Bryophyte: produces spores, not seeds or flowers. Wrong.
- B. Pteridophyta: produces spores, not seeds or flowers. Wrong.
- C. Spermatophyte: produces seeds, and angiosperms are one of its two subgroups. Correct.
- D. Thallophytic: has no true roots, stems or leaves, and no flowers. Wrong.
Step 4: Answer Angiosperms are seed-producing plants, so they belong to the Spermatophyta.
Exam tip: "Sperm" in Spermatophyta relates to "seed" (Greek sperma). Remember the seed-bearing order: Spermatophyta → Gymnosperms (naked seeds) + Angiosperms (covered seeds). If an option says "seed-bearing" or "flowering", think Spermatophyta. Also note that strictly speaking Spermatophyta is a division/group, not a class, but JAMB uses the word loosely here.
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