Auxin

The First Plant Hormone Auxin is the first plant hormone to be discovered and probably the best known of all plant hormones. It plays a major role in the regulation of plant cell elongation and in the growth responses of plants to unidirectional stimuli, known as tropism. Discovery Discovery of auxin is attributed to Charles Darwin and his son Francis ...

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KINGDOM FUNGI

Occurrence of fungi Fungi are found in wide variety of habitats. These habitats are water, soil, dead and decaying organic matter. Fungi are heterotrophic. The./ cannot synthesize their food. Therefore, they get their food from different sources. I. 3aprophytes: These fungi get their food from dead organic matter. They secretes enzyme in their substratum. These enzymes break the organic matter ...

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mucor

Occurrence Minor is a genus of about 3000 species of moulds. . It is a common saprophytic fungus. It grows on dead organic materit I. It is commonly found in soil, digestive systems,plant surfaces,and rotten vegetable matter. In laboratory we can culture this fungus by keeping moist bread under bell jar for two or three days. The fungal mycelium looks ...

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PLASMODIOPHOROMYCOTA

Phytomyxea Occurrence Gen JS Plasmodiophora has single specie. Plasmodiophora brassicae. It is intracellular parasite in the roots of members of family brassicae like cabbage. turnips etc. It causes disease club roots or longer-and toe disease. In this disease the roots are swelled and become club like. General structure This fungus is present in the form of mass of protoplasmic bodies ...

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Plant Growth

 Growth Regulators Growth can be defined as an irreversible increase in dry mass of living material. It actually reflects an increase in amount of protein which has been synthesized, therefore the process of protein synthesis forms the basis of growth. Starting with an individual cell, growth of a multicellular organisms can be divided into three phrases: Cell Division: An increase ...

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Cell wall

Structure of cell wall Cell wall is present only in plant cells. Cell wall is non-protoplasmic. It is considered as metabolic byproduct of the protoplast. Cell wall provides support and protection to cell. It also plays an important role in absorption, translocation and secretion. Cell wall is divided into different layers. Cell twills vary greatly in composition and morphology. It ...

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PYTHIUM

Occurrence It is common in soil water. Its various species live as saprophyte. Some of them live on decaying plant as parasites. The parasitic stage attacks the roots and the seedlings. It causes disease Damping-off. Pyd him debaryanum causes this disease. Some species are parasitic on some freshwater algae. General structure The mycelium of Pythium consists of coenocytic, unseptate and ...

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Ascomycota

Occurrence Penicillium is a common mold. It is found on different substrata. It is most commonly found on citrus and other fruits. It is also found on f000stuffs, jellies, old leather, and paper and in the soil. Pencillium is used for the production of certain acids like fumaric, citric, oxalic. and Gallic acids. It is also used in the production ...

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Plant Tissue

Tissues The group of cells performing some collective function is called tissue. Tissues organize the body of plant for performing different function. Many types of tissues associate with each other to form tissue system. Vascular system is an example of tissue system. The tissues have following characteristics: Tissues are composed of many cells. These cells may be of one type ...

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SACCHAROMYCES-YEAST

YEAST Yeast are common in soil and on decay fruits. Yeasts are found in ails substrates which are rich in sugary substance. Yeast has great industrial importance. They are used in fermentation of sugar into alcohol. Yeasts are extensively used in bakeries and breweries. S’acc haromyces cerevisiae is commonly used yeast. Yeats extract is commercially used for vitamins synthesis. Yeasts ...

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