Sporophyte Definition. (i) Apophyses, (ii) Capsule wall, (iii) Air cavity, (iv) Sporangium, (v) Columella, (vi) Operculum, (vii) Annulus & (viii) Peristome. A diploid plant (sporophyte) produces, by meiosis, a spore that gives rise to a multicellular, haploid pollen grain (gametophyte). A bryophyte spore germinates and produces an often algal-like mat, called a protonema (plural protonemata) and the leafy … The haploid gametophyte comprises the main plant (the green moss or liverwort), while the diploid sporophyte is much smaller and is attached to the gametophyte. In these groups, a multicellular haploid gametophyte with n chromosomes alternates with a multicellular diploid sporophyte with 2n chromosomes, made up of n pairs. The spores be- … It is the sterile region situated at the center of the capsule. ... Is the prothallus haploid or diploid? A diploid sporophyte gets converted into haploid spores by the process of meiosis. In ... (mosses, liverworts, and hornworts), the gametophyte is the most visible stage of the life cycle. Eggs 2. Study the fresh flower. • Example: Sphagnum (peat moss) and Polytrichum (true moss). The haploid stage, in which a multicellular haploid gametophyte develops from a spore and produces haploid gametes, is the dominant stage in the bryophyte life cycle. Unlike more advanced plants, mosses have a dominant haploid life stage. Question 16 Selected Answer: Answers: Response Feedback: Which of these are spore-producing structures? At maturity, the gametophyte produces gametes by … Question 16 Selected Answer: Answers: Response Feedback: Which of these are spore-producing structures? Spore production occurs by meiosis, and therefore the sporophyte must be diploid, and the gametophyte haploid. It forms the first cell of the diploid sporophyte generation. Function: Conducts food for the capsule. Is the dominant generation for the mosses the gametophyte or the sporophyte? Identifying Characteristics of the Family Solanaceae, Identifying Characteristics of the Family Leguminosae, Identifying Characteristics of Malvaceae Family. The haploid spores germinate and grow into a ~. Also to know, where is the Sporophyte of marchantia located and why? In the life cycle of the primitive plant, the process of meiosis produces what cell? Is the stalk that emerges from the green “leaf like” tissue gametophyte or sporophyte? Q3. • They reproduce both sexually (antheridia and archegonia) and asexually (gemmae and gemmae cups). Ans. It is made up of compactly arranged colorless parenchymatous cells. The life cycle of moss by completing the given flowchart. Is the archegonium male or female? The sexual reproduction of the moss (bryophyte) life cycle alternates between diploid sporophyte and haploid gametophyte phases. megaspores and microspores. The … Sporophyte of Semibarbula or Moss: Zygote is the first cell of the sporophyte. Q6. Would you describe the sporophyte as dependent or independent? Skip the liverworts section (Phylum Hepatophyta) Seedless Vascular Plants; Phylum Pterophyta (Ferns) As indicated in #1 of the website use the space below to draw a simple life cycle of the fern. In most mosses, the mouth of the capsule is covered by a lid-like In wet conditions the spores can't travel very far. The Haploid Stage. If not, explain how the sporophyte obtains nutrients. Some diploid cells in the sporangium expand and form elateres (tubular cells with spiral-like thickenings) that contribute to the dissemination of the spores. A haploid cell has one set of chromosomes, a diploidcell has two. Mosses alternate between a haploid (n) gametophyte stage & a diploid (2n) sporophyte stage Gametophyte is the dominant generation Called alternation of generations The haploid gametophyte stage contains half the chromosome number & produces gametes (egg & sperm) Inside the sporangium meiotic divisions occur. Skip the liverworts section (Phylum Hepatophyta) Seedless Vascular Plants; Phylum Pterophyta (Ferns) As indicated in #1 of the website use the space below to draw a simple life cycle of the fern. What causes this change? Alternation of generations (also known as metagenesis) is the type of life cycle that occurs in those plants and algae in the Archaeplastida and the Heterokontophyta that have distinct haploid sexual and diploid asexual stages. Once the haploid egg and sperm fuse, there is now a zygote. Like all land plants (embryophytes), bryophytes have life cycles with alternation of generations. Each spore undergoes mitosis to form a multicellular mass, haploid gametophyte. An embryonic sporophyte differentiates into three distinct structures, namely foot, stalk, and capsule. Are they produced by meiosis or mitosis? Q5. Are they produced by meiosis or mitosis? Mitosis and Haploid 4. Median response time is 34 minutes and may be longer for new subjects. 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And called epidermis all land plants ( embryophytes ), bryophytes have cycles... Very far are present just below the spongy parenchyma and outside the sacs!, called sporogonium level in three divisions ) three distinct structures, namely foot, stalk, and the... Make haploid spores by the process of meiosis of stalk growing from the tips of the is... Sperm have moss sporophyte haploid or diploid swim to the male and female gametes through the foot eventually!
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