Welcome to BiologyDiscussion! Its diploid nucleus divides mitotically to make diploid Ectocarpus plant. (With Methods)| Industrial Microbiology, How is Cheese Made Step by Step: Principles, Production and Process, Enzyme Production and Purification: Extraction & Separation Methods | Industrial Microbiology, Fermentation of Olives: Process, Control, Problems, Abnormalities and Developments, The best answers are voted up and rise to the top. a) Sporophyte: The sporophyte is diploid. Discovery, Classification and Structure. Share Your PPT File. The egg and antherozoids produced by the mature mega-gametangia and micro-gametangia fuse to form zygospore. These gametes are morphologically identical but one is less active, becomes passive after a short period and behaves as female gamete. Whereas, the diploid zoospores serve to multiply the diploid individuals—the sporophytes. The anterior flagellum is longer, pantonematic and directed forward while the posterior is shorter, acronematic and directed backward Fig. In isogamous species the fusing gametes are morphologically and physiologically similar. Both Ectocarpus sexual and asexual life cycles are displayed. Ectocarpus has a haploid–diploid life cycle, involving alternation between two multicellular generations, the sporophyte and the gametophyte. No reduction division takes place during zoospore formation, hence all the zoospores are diploid. There are four types of life cycle in algae such as; 1. 102 D to F). The former produce diploid zoospores and the latter produce haploid zoospores. This sporangial initial becomes enlarged and undergoes repeated mitotic division, thus cells are formed. What do you mean by permeability of membrane? Its diploid nucleus divides mitotically to make diploid Ectocarpus plant. The two gametes of same gametangium or from two different gametangium of same thallus fuse to from zygospore. Haplontic Life Cycle. The alga has an isomorphic, alternation of generations, the gametophyte and the spoiophvte being essentially alike in appearance. The nuclear divisions are not followed by wall formation and the sporangium remains unilocular (Fig. Liberation of the swarmer is through a pore on the cell wall (Fig. a) Sporophyte: The sporophyte is diploid. A large number of male gametes are attracted and cluster around female gamete to make clump formation (Fig. In this article we will discuss about the life cycle of ectocarpus, explained with the help of suitable diagrams. The terminal cell of the branchlet gradually increases in size and becomes ellipsoidal. 2 A). The sporophytic diploid plant forms two types of sporangia: These two types of zoosporangia may be produced on the same plant or on different plants. Our mission is to provide an online platform to help students to share notes in Biology. The haploid plants bear plurilocular gametangia. 2. 102D). Search. The isogametes or anisogametes fuse to form diploid zygospore. The formation of unilocular and plurilocular sporangia is affected by environmental conditions like temperature and salinity of water. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. The diploid zoospores germinate to give rise to diploid individuals which bear plurilocular and unilocular sporangia. It repeatedly undergoes transverse divisions to form a row of 5-12 cells (Fig. In this article we cyfle discuss about the life cycle of ectocarpus, explained with the help of suitable diagrams. Here’s how it works: The zoospores of plurilocular and unilocular sporangia are identical in structure but zoospores of plurilocular sporangia are diploid and zoospores of unilocular sporangia are haploid. TOS4. The sexual thalli of Ectocarpus are haploid. The smaller gametes are produced in micro-gametangia and the larger are produced in bigger mega-gametangia. E. siliculosus produces unilocular sporangia at 13°C, plurilocular at 19°C and both unilocular and plurilocular at 16°C. 104). Name the types of nitrogenous bases present in the RNA. The unilocular sporangia develop singly on tips of small branchlets. The asexual reproduction takes places with the help of biflagellate zoospores. Whereas, the unilocular sporangia produce haploid zoospores. Plants are usually attached to other submerged plants, sometimes to stones or similar other objects. The cells are arranged in regular rows. 4A). Again the plurilocular sporangia borne on the sporophytic plant resemble morpho­logically the plurilocular gametangia, but they produce diploid zoospores and not gametes (Fig. The haploid plants bear plurilocular gametangia. They named the plurilocular reproductive structures as neutral sporangia. Life Cycle of Ectocarpus (With Diagram) | Algae. Life Cycle of Ectocarpus (With Diagram) | Algae. Plants are filiform and more or less branched, or sub-simple from a creeping, penetrating, or disciform base; generally uniseriate but occasionally some segments in the lower part with one or two longitudinal septa; reproductive organs lateral, re­placing branchlets, or intercalary from transformed vegetative cells. Whereas, the diploid zoospores serve to multiply the diploid individuals—the sporophytes. The mature zoospores are liberated from the sporangium through apical or lateral pores. from Roscoff , France, has been studied in culture. With the completion of the nuclear division there is a cleavage into uninucleate protoplasts. Zoospores are produced by mitosis (mitozoospores) in plurilocular sporangia. Further divisions are transverse and vertical in these cells to make hundreds of cubical cells arranged in 20-40 transverse layers. This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. 2 E). 3C). 4B). While the one formed by the direct germination of the zygote bearing unilocular sporangia and plurilocular sporangia is the sporophyte having diploid cells. Skip navigation Sign in. Life Cycle of Ectocarpus (With Diagram) | Phaeophyta. After sometime one male gamete fuses egg to make zygospore and other gametes detach themselves from female gamete. What is its function? What is a mushroom shaped gland? The former produce diploid zoospores and the latter produce haploid zoospores. Structure and life cycle of Ectocarpus Ms. Inderveena Sharma H.O.D. The largest mega-gametangia represent oogonia and the smallest micro-gametangia represent antheridia Fig. The haploid plants bear plurilocular gametangia. Life Cycle of Ectocarpus (With Diagram) | Phaeophyta. 5A-E). The micro-and macrogametes after liberation fuse and form zygote, (Fig. What is the significance of transpiration? Reproductive Structures of Ectocarpus | Algae, Modes of Reproduction in Ectocarpus (404 Words), Sargassum: Occurrence, Structure and Reproduction. They remain motile for about 30 minutes. Like unilocular sporangia, the plurilocular sporangia also develop from the terminal cells of the branchlets of diploid sporophytic plant. 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. Many transverse and vertical divisions result in llfe of cubical cells arranged in transverse tiers Fig. Discovery, Classification and Structure. Ectocarpus Life Cycle and Reproduction. Sexual reproduction may be isogamous, anisogamous or oogamous type. 36 A-D). The zoospores discharge en-masse in gelatinous matrix through a terminal pore in sporangium. The zygote so formed germinates- directly producing a diploid plant—the sporophyte which resembles in every respect, the gametophyte that has produced plurilocular gametangia, only difference being the diploid plant bears plurilocular sporangia also known as neutral sporangia (Fig. Some species of Ectocarpus are epiphytic e. In many species of Ectocarpus, the thallus is sparingly to profusely branched, the cells are uniseriate, joined end to end in a ccycle. In physiologically anisogamous species, gametes from two filaments of different strains fuse. 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