Question

explain the life cycle of acellular mould

Answer 1

Answer:

Explanation:

Acellular slime moulds are referred as Plasmodia slime moulds. They are found in decayed material in vegetable. A free living somatic phase of this type of slime mould is known as Plasmodium. Plasmodium is multi nucleate and is colored. It possesses number of branches referred as veins in which protoplasm shows reversible streaming movement. Along with the movement of plasmodium veins appear and disappear. The movement of plasmodium occurs by pseudopodia. They have saprotrophic mode of nutrition. Plasmotomy is other mode of reproduction in which plasmodium undergoes division. Perennation is the mode of reproduction in which slime moulds can survive extreme conditions like high temperature and low pH. They form cyst and a thick covering is formed around mould referred as Sclerotium. Cyst and sclerotium remain inactive for long periods. When there is scarcity of food all the products of plasmodium aggregate at one or more point and form papilla that grows into stalks referred as sporophores. It bears fruiting bodies known as sporangia. It has hard and brittle wall known as Peridium. Sporangium has many diploid nuclei which undergo meiotic division and change multinucleate into uni nucleate segments by cleavage. They later on become spore. They are dispersed by air and some of them show allergic reaction. After this spore germinates and release biflagellate swarm cell and aflagellate myxamoeba. They require water for germination. These cells later fuse and form zygote. Zygote moves over the substratum and attacks bacteria, yeast. It increases in size. Zygote goes under mitotic division and becomes multinucleate amoeboid structure known as Plasmodium.