Choose the wrong pair from the following
A. Hepaticopsida-Marchantia
B. Lycopsida – Selaginella
C. Bryopsida – Anthoceros
D. Pteropsida- Dryopteris
E. Sphenopsida-Equisetum

Hint: Taxonomy is the branch of science which deals with the identification, classification, characterization and naming of organisms. Living organisms are classified based on their similarities and characters. Closely related organisms are kept within a group and unrelated organisms are kept in a far away group.

Complete answer:
A taxon is a taxonomic group of any rank. There are seven taxonomic ranks which includes kingdom, Phylum, class , order, genus, family, species.
Now let's study each options given;
• Genus Marchantia is placed under the class Hepaticopsida. It is placed under the Phylum Bryophytes. Most of the organisms present in the group are liverworts. The plant body is flat, long , dichotomously branched. Thallus have scales in the ventral surface.
• Genus Selaginella belongs to the class Lycopsida. Plants in this taxon are vascular plants which are herbaceous in nature. The spores of the plants are highly inflammable. So, they are used in fireworks.
• Genus Dryopteris belongs to the class Pteropsida. Plants in this taxon are vascular plants which are no longer in use. This taxon mainly includes the wood ferns.
• Genus Equisetum belongs to the class Sphenopsida. Plants in this taxon are the only vascular plants which reproduce by spores rather than seeds. This taxon is also called horsetail grasses.
• Genus Anthoceros belongs to the class Anthoceropsida. The plants present in the taxon are called field hornwort.
• True mosses belong to the class Bryopsida. It is the largest class of mosses. It consists of six orders.

Hence, the mismatched option is (C).

Note: Anthoceros is a genus of hornworts which belongs to class Anthocerotaceae. There is a large number of living organisms which includes both plants and animals present in the surroundings. Taxonomic studies help to study about the organisms in a systematic manner. It helps.in easy understanding and fast study about the organisms.