3 Brown Algae Nearly all multicellular marine organisms. Commonly referred to as seaweeds.They have cell walls made of cellulose and alginic acid.Large flat fronds that are useful for withstanding tidal forces.
4 Brown AlgaeThey have holdfasts at their bases that prevent them from being washed out to sea.They form the kelp forests off the coast of Northern California.It is the only multicellular protist that has well-differentiated tissues: used to carry nutrients through the large fronds.
6 Dinoflagellates Unicellular Photosynthetic Mostly marine Their protective coats are made of stiff cellulose platesIdentified as a group by the presence of two flagellaeThey are extremely numerous and form an important food source for small marine animalsTheir reproduction is usually cell division even though they are capable of sexual reproduction
7 DinoflagellatesIn certain conditions they can increase rapidly in population and form a red tide. That big of a population produce toxins that can kill fish poison people who eat shellfish that have fed on algae.Some species of Dinoflagellates are symbiotic, living in bodies of invertebrates such as sea anemones, molluscs and corals called zooxanthellae which lack the characteristic cellulose pates of this phylum This symbiotic relationship is the main reason for the high productivity of coral reefs in nutrient poor waters
10 Red Algae are delicate, muticellular seaweed found mostly in warm seawaters. They are hard and crusty due to calcium carbonate deposits by species called coralline.
11 Red algae get their colour because their pigments absorb green, blue and violet light efficiently. Since these light rays penetrate the deepest past the water’s surface, red algae has the ability to grow at deeper depths than other types of algae.
12 Red algae is very important to sea life Red algae is very important to sea life. Red algae and coral animals together help build coral reefs.Some species of red algae contain material in their cell walls that is the source of agar.
13 Euglenoids Kingdom Protista Small and unicellular freshwater organisms They have two flagellae (one usually longer)Classified among plant like protistsOver half do not have chloroplasts and are heterotrophs
14 Information cont’dEuglenoids with chloroplasts raised without light loose them.They ingest or absorb foodThese algae can be autotrophic or heterotrophic
18 DIATOMS Diatoms are unicellular algae found in oceans Diatoms are one of the biggest components of planktonDiatoms are a major food resource at the base of marine and freshwater food websThey are also a major source of oxygen
19 DIATOMS Diatoms have rigid cell wells with an outer layer of silica They look like small jewel boxesDiatom skeleton is divided into two part one epitheca and the other hypotheca. Both of these are made out of two parts. The valve and the flattened plate.
20 DIATOMSDuring asexual reproduction, they spilt in two, then grows a new half to fit inside the old oneThe rigid cell wall cannot grow once formed, so every generation of diatoms is smaller then the one beforeReduction in size continues until they reproduce sexually, producing a zygote that grows to original size, creating a new cell wall
22 Green Algae What is Green Algae? Green algae is the most plant-like of the algaeThey share the same types of chlorophyll and same colour as most land plants.Like plants, their cell walls contain cellulose and they store food reserves in the form of starch.
23 Green Algae Where they live: Most commonly found in freshwater and damp places on land.Some are known to live in the wet fur of tropical rainforest’s tree sloths.Ulva, a common marine algae, can be found attached to exposed rocks during low time.
24 Green Algae - Properties Some are unicellularSome are colonialSome form filamentsOthers are multicellularGreen Algae can produce both sexually and asexuallyAsexual reproduction, the cell divides to form flagellated spores that resemble the parentChlamydomonas can also reproduce sexually forming gametes of two different types that fuse to form a zygote.This occurs during unfavorable conditions
25 Green Algae - ExamplesThe Chlamydomonas, Ulva, and Volvox are three of the most common Green Algae.Algae, like the Ulva, can grow to be one metre in length and produce spores with flagellae the flagellae helps them swim.Algae, like the Chlamydomanas, have what is called an eye-spot this helps it swim towards light and conduct photosynthesis.A Volox colony is composed of hundreds of flagellated cells arranged in a single layer - This forms a hollow ball-shaped structure