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Which of the following is an aquatic pteridophyte?
1. Lycopodium
2. Azolla
3. Equisetum
4. Pteris

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Correct Answer - Option 2 : Azolla

Concept:

  • Pteridophyta: Plants from this group have well-developed roots, stem and leaves, and separate tissues for conduction of food and water. But, they do not bear flowers and fruits.

Explanation:

  • Azolla is a free-floating aquatic fern (pteridophyte).
  • There are six species of Azolla – Azolla Carolina, Azolla nilotica, Azolla filiculoids, Azolla Mexicana, Azolla microphylla and Azolla pinnata.
  • They are extremely reduced in form and specialized, looking nothing like the typical fern but more resembling duckweed or some mosses.
  • It can be used as animal feed, human food, medicine, and water purifier.
  • It is also used as a bio-fertilizer which improves soil fertility and boosting crop yields.

  • Lycopodium belongs to the class lycopsida. The plant body is differentiated into roots, stems, and leaves but the stem is not divided into nodes and internodes.  
  • Equisetum (Pipe) also called as ''horse tail'' is included in the class sphenopsida.
  • The plant body is differentiated into root, stem, and leaves. Roots are adventitious.
  • Their stem is jointed i.e. their stem is divided into nodes and internodes
  • Pteris belongs to the class pteropsida of the phylum Pteridophyta.  

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