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التبادل الاعلاني


    الطحالب (Algae)

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    ذكر عدد المساهمات : 36

    الطحالب (Algae)

    مُساهمة من طرف Admin في الخميس ديسمبر 17, 2009 10:52 am


          1. Cool
            Characteristics

            Range in size from microscopic to single celled or
            ganisms to large seaweed
            Autotrophic
            Form the reproductive structures – gametangia or gamete chambers
            Aquatic and have flagella at some point in life
            Often contain pyrenoids, organelles that synthesis and store starch

            STRUCTURE[/center
            • Thallus (haploid)
            • Four types of algae
            – Unicellular
            – Colonial
            – Filamentous
            – multicellular
            [center]CLASSIFICATION OF ALGAE

            • SEVEN PHYLUM BASED ON
            – COLOR
            – TYPE OF CHLOROPHYLL
            – FOOD-STORAGE SUBSTANCE
            – CELL WALL COMPOSITION

            REPRODUCTION

            MOST REPRODUCE BOTH SEXUALLY AND ASEXUALLY
            – Most sexual reproduction is triggered by environmental stress
            – Asexual Reproduction
            • Mitosis
            – Sexual Reproduction
            • Meiosis
            • Zoospores
            • Plus and minus gametes
            • Zygospore
            Reproduction in Multicellular Algae

            • Oedogonium reproduction
            – Antheridium-release flagellated sperm that swim to the oogonium
            – Oogonium-houses the zygote which is a diploid spore
            • The spore undergoes meiosis and produces 4 haploid zoospores. One of the four cells becomes a rootlike holdfast the others divide and become a new filament.

            Ulva Reproduces by Alternation of Generations

            • Two distinct multicellular phases- one is haploid and the other is diploid
            – Gametophyte is haploid
            – Sporophyte is diploid
            Phylum Chlorophyta

            • Green algae
            • 7000 diverse species
            • Biologist reason that green algae give rise to land plants.
            • Both green algae and land plants have chlorophyll a and B as well as carotenoids and store food as starch
            • Both have walls made of cellulose
            Phylum Phaeophyta

            • 1500 species of Brown algae
            • Mostly marine and include seaweed and kelp
            • All are multicellular and large (often reaching lengths of 147 feet)
            • Individual alga may grow to a length of 100m with a holdfast, stipe and blade
            • Used in cosmetics and most ice creams


            Phylum Rhodophyta

            • 4000 species of RED Algae
            • Most are marine
            • Smaller than brown algae and are often found at a depth of 200 meters.
            • Contain chlorophyll a and C as well as phycobilins which are important in absorbing light that can penetrate deep into the water
            • Have cells coated in carageenan which is used in cosmetics, gelatin capsules and some cheeses
            Phylum Euglenophyta

            • 1000 species of Euglenoids
            • Have both plantlike and animal-like characteristics
            • Fresh water

    إسلام صلاح(المزارى)

      الوقت/التاريخ الآن هو الإثنين يناير 16, 2017 9:40 pm