Normally these fungi are saprophytes but have the capacity to infect the living organisms also e. In general, a fungus reproduces by three methods: Biologically the members are parasites rusts and smuts as well as saprophytes.
Economically the members of this class are very important. A mass of loosely interwoven hyphae is called mycelium Fig. The vegetative mycelium is septate and profusely branched.
Thus, they are exogenous in origin.
Spores may be unicellular or multicellular, motile or non-motile, may Essay mould in colour, shape and size.
The association between the fungus and roots Essay mould higher plants is called mycorrhiza Gr. Aplanospores may be uninucleate or multinucleate. They are produced at the tip of vertical hyphae known as conidiophores. Thus, they are haploid to give rise to mycelium of primary nature.
Most of the members are parasitic on algae. Seven types of life patterns are shown by fungi Raper, Normally these fungi live as parasites but in the absence of the living host they may also get their food material from the dead organic matter saprophytes e.
It is called dolipore septurm. The mycelium may be intercellular present in between the cells of the host tissueintracellular penetrates in the host tissue cells in parasitic fungi or spreads as loose mass of interwoven hyphae in saprophytic fungi.
The characteristic reproductive organ of this class is basidium. These are of two types: Saucer shaped, flat open bed of condidiophores Fig. Plasma lemma forms convoluted outgrowths beneath the cell wall.
Fungi may be polymorphic producing more than one type of spores e. The primary zoospores are pear shaped and have both the flagella at the anterior end while secondary zoospores are kidney shaped and have both the flagella attached laterally.
The aseptate and multinucleate mycelium is called coenocytic e. Motile cells are absent in the life cycle of higher fungi subdivisions Ascomycotina, Basidiomycotina and Deuteromycotina.
Except subdivision Deuteromycotina sexual reproduction is present in all fungi and it is completed in three phases—plasmogamy fusion of two protoplasts of two gameteskaryogamy fusion of two nuclei of fusing gametes to form a zygote nucleus and meiosis formation of four haploid spores.
These are never involved in any type of sexual reproduction.
The thallus is coencocytic and filamentous. Some members of fungi e. Intercellular mycelium produce haustoria to absorb the food material from the cells e.
All the members of this class produce motile cells zoospores or gameteseach equipped with a single posterior, whiplash flagellum. Now-a-days fungi can be classified by using the following biochemical criteria: The gametangia of equal or unequal size unite to form the resting spore called zygospore.
Asexual reproduction takes place by bi-flagellated zoospores. Important diseases caused by the members of this class are apple scab, powdery mildew of grapes and peaches etc.
The filamentous forms are coenocytic. Except slime molds subdivision Mastigomycotina the fungal cell is bounded by a cell wall. Clamp connections are present.Instances of Mold Essay - Instances of Mold Mold is a fungus that can be found in damp places like bathrooms and basements.
Mold travels in the air as tiny spores. The spores find their way to a wet area. This is where the spores breed and grow. Bread Mold Lab Report Essay Title: Bread Mold Lab Purpose: The purpose of this lab was to test the effect of water on bread mold growth.
Hypothesis: I hypothesized bread mold would grow faster if the bread was exposed to water. Check out our top Free Essays on Bread Mold to help you write your own Essay.
Due to this reason,a large number of psycologists agreed that “languages mould the way we think” and “if all mankind spoke the same language, we would think the same way”. I do not think that this is an entirely correct opinion. Language is the way humans communicate with each other and express their idea.
Mold essays My topic was mold. Unlike mildew, mold grows when something gets old. Mold and mildew have some things in common: they can both grow on leather, and clothes but.
Bread Mold Experiment Essay Words | 9 Pages Bread Mold Experiment By: Stephanie Westover PURPOSE The purpose of this experiment will be to determine how temperature affects the growth of mold on wheat bread.Download