AP BIOLOGY

Detailed explanation-1: -The sperm are produced within tiny, typically stalked, club-shaped structures called antheridia and you can also see bryophyte sperm referred to as antherozoids. The stalk anchors the antheridium to the gametophyte. Each antheridium produces numerous sperm.

Detailed explanation-2: -Antheridium and archegonium are reproductive organs in nonflowering plants such as ferns, mosses, and other nonflowering plants. The antheridium is the male gametophyte and produces sperm cells (male gametes). The antheridium will produce numerous sperm for fertilization.

Detailed explanation-3: -Mosses are the most common, diverse, and advanced group of bryophytes, a division of green, seedless plants that dates back to the Permian period (286 to 245 million years ago). In bryophytes, the antheridium is the male sex organ, which produces sperm.

Detailed explanation-4: -The archegonia and antheridia of mosses are large enough in many species to be just visible to the unaided eye. The jacket cells of the antheridia are often coloured bright orange or rust; their sperm are biflagellate.