The small intestine is the longest section of the digestive tube and consists of three segments forming a passage from the pylorus to the large intestine: Duodenum: a short section that receives secretions from the pancreas and liver via the pancreatic and common bile ducts. Once double fertilization occurs, the egg cell becomes the zygote which is then considered sporophyte tissue. All land plants have alternation of generations. Quiz Mark Biology Assuming that they all belong to the same plant, arrange the following structures from largest to smallest. Douglas Fisher, Helen Fisher, Eric Fisher, Ministry of Livestock and Fisheries, Latris, fish, Medialuna, Tripod fish, Fisherville, Fisholme, Fishcross Pollen grains are male gametophytes, which contain the sperm (gametes) of the plant. Even though angiosperms have fancy fruits and flowers, they still have gametophytes, gametes, spores and sporophytes. In mosses and their relatives (Bryophytes), the haploid gametophyte is the dominant generation, and the diploid sporophytes are sporangium-bearing stalks growing from the gametophytes. Gametophytes are haploid (n) and have a single set of chromosomes, whereas Sporophytes are diploid (2n), i.e., they have two sets of chromosomes. Microspores develop into pollen grains, which are the male gametophytes, while megaspores form an ovule that contains the female gametophytes. A. Sori contain sporangia. A. charophyte B. fern C. green alga Chlamydomonas D. moss E. liverwort 44. In the ovule, the megasporocyte undergoes meiosis, generating four megaspores; three small and one large; only the large megaspore survives and produces the female gametophyte (embryo sac). Pogil activity on the digestive system answers On the small end of the spectrum, some species have mature female gametophytes with only 4 cells, each with one nuclei. B. Spores are haploid. The gametophytes of seed plants are microscopically small and develop from spores retained within the moist sporangia of the parental sporophyte. For which of the following organisms is the sporophyte stage the dominant stage in the life cycle? Conversely, some species have 10 celled mature female gametophytes consisting of 16 total nuclei. The alternation of generations is an important concept in the evolution of plants. C. Gametophytes have rhizomes. Pollen grains can travel far from their original sporophyte, spreading the plant’s genes. Which one of the following statements about a typical fern life cycle is false? In seed plants, the delicate female gametophyte and the young sporophyte embryo are protected from many environmental stresses, … The angiosperm life cycle looks like this: If you can ignore the flower for the moment, you’ll notice that on the sides of the diagram, a spore is just … An independent sporophyte is the dominant form in all clubmosses, horsetails, ferns, gymnosperms, and angiosperms (flowering plants) that have survived to the present day. Pogil activity on the digestive system answers. Gross and Microscopic Anatomy of the Small Intestine. Most algae have dominant gametophyte generations, but in some species the gametophytes and sporophytes are morphologically similar (isomorphic). The small haploid (1n) cells are encased in a protective coat that prevents desiccation (drying out) and mechanical damage. D. 1. antheridia 2. gametes 3. gametophytes 4. gametangia All multicellular plants have a life cycle comprising two generations or phases. 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