Relevance. • In bryophytes and pteridophytes, flagellated sperm must swim through a film of water to reach eggs cells in archegonia. • In seed plants, the use of resistant, far-traveling, airborne pollen to bring gametes together is a terrestrial adaptation. By the time the pollen tube reaches the archegonium, both the egg and sperm are fully mature, and the egg is ready to be fertilized. The tiny diploid sporophytes, which remain attrached to the parent plant, have a very simple structure. Bryophytes require water to reproduce (at least most of them)...can I assume the sperm have flagella?-Thanks. •While some primitive gymnosperms have flagellated sperm cells, the sperm in most gymnosperms and all angiosperms lack flagella. Archegonia are present in the female gametophytes of Ephedra, but only eggs occur in those of Gnetum and Welwitschia. 0 2 0. These spores are surrounded by curious long and twisted moist cells called elaters. Ginkgos and cycads show a transitional stage between the primitive ferns and the more advanced conifers and flowering plants. Textbook solution for BIOLOGY:CONCEPTS+APPL.
(LOOSELEAF) 10th Edition STARR Chapter 21 Problem 6SA.
Why is the presence of flagellated sperm in cycads surprising? Indeed, all taxa of bryophytes requires water because they have flagellated sperm, so you are correct. c. Pollen grains in some rare taxa are flagellated. They have flagellated sperm, but the male gametophyte grows a pollen tube, a long filament through which the sperm can safely swim to the egg. 22. (LOOSELEAF) 10th Edition STARR Chapter 21 Problem 6SA.
• In seed plants, the use of resistant, far-traveling, airborne pollen to bring gametes together is a terrestrial adaptation. a. All Plants: eukaryotic, multicellular, autotrophic, possess chlorophyll a and b, cellulose in cell walls, practically immotile.
Pteridophytes do not have true roots, but have hyphae instead, which do not contain vascular tissue. A.Both kinds of plants have flagellated sperm that need water to reach the female gamete. In all living gymnosperm groups, the visible part of the plant ... cycads and Ginkgo are the only seed plants with flagellated sperm. Anonymous. Conifer sperm do not have flagella but rather move by way of a pollen tube once in contact with the ovule. We have step-by-step solutions for your textbooks written by Bartleby experts! b. Flagellated sperm only swim internally. Login to reply the answers Post; Still have … No egg cells have flagella. This new sporophyte is called a fiddlehead, and will eventually grow into a mature sporophyte. The sporophyte generation is much larger than the gametophyte generation in ferns but is smaller than the gametophyte generation in mosses. Meiosis within the sporophyte produces a number of haploid spores. Favorite Answer. Conifer sperm do not have flagella but rather move by way of a pollen tube once in contact with the ovule. We have step-by-step solutions for your textbooks written by Bartleby experts!