Perhaps the best known and most widely used food alga in Western Europe in recent centuries was Irish moss, or carragheen Chondrus chrispuswhich was cooked with milk, seasoned with vanilla or fruit, and made into a highly palatable dish known, as blancmanges. The plant is fixed to the substratum by means of highly branched multicellular rhizoids.
Some are even equipped with cellulases to break this intractible beta The euglenoids, or Euglenophyta, are single-celled, protozoan-like algae, mostly occurring in freshwater.
The answer to the first question forms the subject matter of this present article; but the answer to the second is much more diffuse and will be found scattered throughout the rest of this series of articles.
Certain algae like chlamydomonas are being used in genetical studies. The stage develops in response to toxic chemicals and unfavorable water conditions.
The contribution of the second category is worked out as 1. In the tanning industry agar imparts a gloss and stiffness to finished leather.
Zygote develops into a resting thick walled zygospore. Both free floating and attached forms occur. A direct result of human interference, eutrophication is caused by the addition of excess nutrients runoffs of phosphate and nitrate from chemical fertilizers and sewage disposal to the water that encourage algae to grow abundantly.
Brown seaweeds provide a natural source for the manufacture of chemicals called alginates that are used as thickening agents and stabilizers in the industrial preparation of foods and pharmaceutical drugs.
The alginates are used in rubber-tyre industry, paints, and ice-creams and in preparation of flame proof fabrics and plastic articles. Asexual reproduction in most brown algae is by biflagellate zoospores that are pear-shaped and have two unequal laterally attached flagella.
Zoospores are flagellate spores while aplanospores and hypnospores are non-motile. From above discussion it is clear that algae are great importance for human being. Several writers have implied that people used to eating seaweed may have brought about the selection of intestinal micro-organisms capable of processing this type of food.
Because the algae are photosynthetic they must be synthesizing throughout this aquatic environment enormous quantities of organic matter — in other words, their contribution to the credit side of the biological bank-balance of energy must be colossal. We can now get some idea of the standing crop of plant material: Male sex organs or antheridia produce uniflagellate sperms.
They have no flagella and typically grow attached to a hard surface or on other algae. Volvoxnon-flagellate colonies e. As such it is indispensable in bacteriological laboratories, because no adequate substitute for agar is known.
Because of their photosynthetic abilities the algae are the primary producers of the aquatic environments. Sodium laminarin sulphate is blood anticoagulant. The large forms often possess air vesicles or bladders for providing buoyancy. Modern industry has refined and expanded these uses to meet new needs in the manufacturing of such items as photographic film, shoe polish, dental impression molds, shaving soaps, and hand lotions.
Early industrial uses of agar in the Orient included sizing fabric, water-proofing paper and cloth, and making rice paper more durable.
Geliduim, Gracillaria algae are chief source of agar agar. In oogamy there is a large food laden non-flagellate female gamete called egg or oosphere.
Green algae occur in all types of habitats. Parphyratenesa is very popular and eaten throughout Japan. The vegetative cells have a cellulosic wall usually covered on the outside by a gelatinous coating of algin. These are alginic acid and their derivatives, the most common being algin.
Freshwater algae can also cause problems when they are overly abundant.Many slimy rocks are covered with algae such as diatoms or cyanophytes, and algae are the cause of green or golden sheens on pools and ponds.
Algae are the base of the food chain for all marine organisms since few other kinds of plants live in the oceans. Nov 22, · Economic importance of Algae Since from olden days Algae species are intimately connected with human beings as a source food, medicine and other uses.
Fungi have established mutualistic symbioses with cyanobacteria and chlorophycota (green algae) to form lichens. Fungi often form symbiotic associations with the roots of plants (bryophytes, pteridophytes, gymnosperms and angiosperms) in mycorrhizae.
Importance of the Ecological Footprint Everyone has desire, and it will never get satisfied. Because of our desire, we use all the resources we can reach or find to produce better product and develop the technology to make our life better and easier.
Ecological importance of algae Economic products obtained from algae Anyway, what about the importance of algae in environmental control. Cassidy. Dec 14, @ pm. Love this site! But i hate the work i have to do in science class so BYE! sidra. Ecological importance of algae Microscopic algae are the source of much of Earth's oxygen.
Algae are also very important ecologically because they are the beginning of the food chain for other animals.Download