The Black Sea, located in the Middle East. Aurelia with special reference to structure, reproduction, development & Polymorphism. Graphic outline of life cycle of a typical pteridophyte (fern). Coelenterata: Structure, reproduction and development of Obelia. The male sponge releases sperm into the water which travels towards and enters the female sponge. "Class Demospongiae Sollas, 1885". There are many sponge species in which each sponge is considered male and female. Polymorphism. Importance of Phylum Nematoda Parasitic diseases. Wiki User Answered . Rhabditis: This genus contains many species. Human intrusion in coral reefs. A brief account of Corals and Coral reefs. Table of Content1. Coelenterata: Aurelia with reference to structure, reproduction and development. They continually bring the lower soil … SNAIL Earthworms are of great economic importance to man. When it comes to sexual reproduction, a sponge can play either role. Systema Porifera. Coelenterata: Habit, habitat, structure, reproduction and development of Obelia. e. By means of stamen character only, how will you differentiate the various families which are included in your syllabus. (iii) Identify and describe the beak or feet. (a) Useful role of bacteria: • Medicine: antibiotics, serums and vaccines • Agriculture: nitrogen cycle (role of nitrogen fixing, nitrifying and denitrifying bacteria) • Industry -curing of tea, tanning of leather. Aschelminthes has many important parasites. Top Answer. Economical Importance of Sponges •At one time there was a market for sponges to be used in the bathroom and the kitchen because of their ability to absorb water, however synthetic sponges have replaced this industry Sea sponge Skeleton to be used in the bathroom for washing 10 . 5) Ecological and economical importance of Porifera is that it is in all aquatic habitats, microbial sumbionts, and creates habitats for other organisms, sponge beds are also “hotspots” for diversity. (12 lec.) Coral and dinoflagellate symbiosis and coral bleaching. 5. Porifera has been derived from 2 Greek words. Sponges can reproduce sexually and asexually. (ii) Economic importance of Bacteria. Definition of homospory and heterospory with relevant examples. Economic damage by D. dipsaci depends on a combination of factors, such as host plant susceptibility, infection level of the soil, soil type and weather conditions. Earthworms in Agriculture: Earthworms make burrows and hence aerate the soil. Their tunnels act as water storage, which is important when rain is scarce. 3 Ratings, (9 Votes) weeds are unwanted plants in human controlled settings and as such have no value.however in the correct... solution.pdf. Polymorphism. Animalia - non-chordates from Porifera to Echinodermata and Chordates - all five Classes. We cannot deny the fact that sponges are somewhat a threat to oyster industry because they grown on oyster shells covering its surface and thus preventing the oyster from getting food and as a result oyster dies. How weird would it sound if it was called Porifera Bob Square Pants? Article Shared by. 5 Que. They are found in soil, organic matter, water and feces of man and animals. They are sedentary and sessile except the free swimming, larval form. f. Energy flow in an ecosystem is always unidirectional. The sponge species Geodia barretti can filter up to 1,000 liters of water per kilogram of tissue ADVERTISEMENTS: 1. A brief account of corals & coral reefs and their importance. These bacteria cause some very serious diseases in man and plants. (b) Submission of any five pests. Economic importance. Economic importance of Coelenterates. The economic is that they can absorb water and filter shit, Medicine. economic importance of hydra Jun 30 2011 10:46 AM. Flatworms are … 1 Approved Answer . J. N. A. Hooper and R. W. M. van Soest (2002). Scientists estimate that there may be another 1 to 8 million undiscovered species of organisms living in and around reefs (Ocean Service Education) Coral also has a very big economical importance. Phylum porifera 1. Poros – pure and ferre – to bear Important characters: Their body possesses numerous, minute pores called ostia. 6. (c) Pteridophyta: characteristics; classification into classes: psilopsida (Psilotum), lycopsida (Selaginella, Lycopodium), sphenopsida (Equisetum) and pteropsida (Dryopteris, Pteris and Adiantum). Protozoan - Protozoan - Ecological and industrial importance of protozoans: Protozoans play important roles in the fertility of soils. Porifera Life Cycle. Ecological role and potential economic value of sponges to the Torres Strait: Annual Report 2009 1 Summary Sponges are a key representative group throughout the coral reefs of Torres Strait. (ii) Identify and give its economic importance. Read along to find more interesting bits of scientific information about Porifera. Answer. 3. Asked by Wiki User. (a) Find out the effect of neem extract on mosquito larvae or on given pest. They play an important role in agriculture and are the best friends of farmers as they are continuously ploughing and manuring the soil. Flatworms have been an important part of biological communities since well before any animals emerged on land. These are harvested by divers and can also be grown commercially. In this article we will discuss about various economic importance of protozoa. Economic importance of Coelenterates. Edible Molluscs: (i) Edible Oysters: From ancient times the Romans and Greeks used the oysters as a main dish in their meals. 52-90 4 Phylum Coelentrata: General Characters, Classification up to order. Since Ctenophora reproduce quickly and are good predators, they can easily bring down an ecosystem where they have no predators. 2012-10-12 01:06:17 2012-10-12 01:06:17. Any fluke, including the human liver and lung flukes, is a type of flatworm. ECONOMIC IMPORTANCE OF EARTHWORM. Related Questions. Ask your question! Some growth habits and forms Corals have huge ecological importance. They are aquatic, mostly marine and few are fresh water. For example, they live in water, in moist surface of soil, in air and even as commensals and parasites in animals and plants. However, a few species of earthworms are harmful. The Red Indians were great oyster eaters. Teredo, the shipworm burrows into wooden structures immersed in the sea, it causes serious damage … S. No. Pest management. Coral and dinoflagellate symbiosis and coral bleaching. Flatworms have multiple parasitic forms that can be devastating for humans and other animals. chitra says: at 2:18 pm how we have to download. Que. The infamous tapeworm is another very specialized form of parasitic flatworm.

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