Which one of the following statements is correct ?

Options

A. Horsetails are gymnosperms
B. Selaginella is heterosporous , while Salvinia is homosporous
C. Ovules are not enclosed by ovary wall in gymnosperms
D. Stems are usually unbranched in both Cycas and Cedrus.

Explanation

In gymnosperm ovules are not enclosed by ovary wall . Seeds do not occur inside a fruit . They are naked . Horsetail is the common name of Equisetum . Pteridophytes like Selaginella and Salvinia are heterosporous and possess two types of spores , i.e. microspores and megaspores . Cycas has an unbranched columnar stem while Cedrus possess branched stem .
Therefore , only statement (c) is correct.