EasyBiologyHigh School (11–12)Diversity of Living Organisms › Bryophytes and PteridophytesConceptual
A college garden labels four pteridophytes: Psilotum, Lycopodium, Equisetum and Adiantum.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A college garden labels four pteridophytes: Psilotum, Lycopodium, Equisetum and Adiantum. Place each in its class, and give the common name of two of them.
Need a reminder? The key ideaShow
Pteridophytes are the first land plants with xylem and phloem. The main plant body is the diploid sporophyte, with true roots, stems and leaves. Sporangia on sporophylls make spores by meiosis (in many ferns, 16 spore mother cells give 64 spores in a sporangium); some form strobili. A spore grows into a free-living prothallus with antheridia and archegonia, and fertilisation needs water. Classes: Psilopsida, Lycopsida, Sphenopsida, Pteropsida.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Classes.
- Psilotum: Psilopsida.
- Lycopodium: Lycopsida.
- Equisetum: Sphenopsida.
- Adiantum: Pteropsida.
Step 2. Common names. Equisetum is the horsetail, Adiantum the maidenhair fern, and Lycopodium the club moss.
Answer: Psilopsida, Lycopsida, Sphenopsida and Pteropsida in that order; for example, horsetail (Equisetum) and maidenhair fern (Adiantum).
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