AP BIOLOGY

Detailed explanation-1: -The leaves in pteridophytes are small (microphylls) as in Selaginella or large (macrophylls) as in ferns. The sporophytes bear sporangia that are subtended by leaf-like appendages called sporophylls. In some cases sporophylls may form distinct compact structures called strobili or cones (Selaginella, Equisetum).

Detailed explanation-2: -Ferns are pteridophytes, i.e. they are land plants which reproduce through spores. These spores are formed in structures called sporangia. The leaves which bear these sporangia are called sporophylls. sori is a cluster of sporangia.

Detailed explanation-3: -The sporophytes bear sporangia that are subtended by leaf-like appendages called sporophylls.

Detailed explanation-4: -Sporophylls are the leaves which have spore bearing chambers called sporangia on their undersurface. In some pteridophytes such as Equisetum and Selaginella, the sporophylls form prominent compact structures known as strobili or cones.

Detailed explanation-5: -A leaf that bears sporangia (spore-producing structures) is called as sporophyll. They vary greatly in structure. In ferns, the sporophylls are the normal foliage leaves, produce clusters of sporangia, known as sori.