April, 2020

• 19 April

  Defense Against Disease : Active And Passive Immunity

  

  We now want to tell in detail something that was too important for our immune system. Our ability to defend ourselves against infection by pathogens (disease-causing organisms). We have seen that some people experience few or no symptoms when exposed to certain infectious diseases. Even though a person may be …

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• 19 April

  Enzyme & Their Substrates: Mode of Action

  

  Enzymes are protein molecules that can be defined as biological catalysts. A catalyst is, “A molecule which speeds up a chemical reaction but remains unchanged at the end of the reaction“.Virtually every metabolic reaction which takes place within a living organism is catalyzed by an enzyme and enzymes are therefore …

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• 19 April

  Key: A plant Identifying Method

  

  It is estimated that in the present world, the number of plant species is as many as five million. Among them about 391,000 species of vascular plants-are currently known to science of which nearly 369,000 species (94%) are phanerogamic or flowering plants as other 6% is consisted with cryptogamic or …

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• 19 April

  An Overview of Chytridiomycetes

  

  The phylum Chytridiomycota contains five orders, 900 species and the single class Chytridiomycetes which contains a number of parasitic species. At least two species in this class are known to infect a number of amphibian species. These are the only members of the kingdom Fungi that produce motile cells at …

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• 18 April

  Fungi: Vegetative Structures & Growth

  

  With the invention of the microscope by van Leeuwenhoek in the seventeenth century, the systematic study of fungi began. And the man who deserves the honor of being called the founder of the science of mycology is Pier Antonio Micheli, the Italian botanist who, in 1729, published Nova Plantarum Genera, …

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• 18 April

  Fungal classification: Lower & Higher Fungi

  

  Biologists use the term ‘fungus’ to include eukaryotic, spore-bearing, achlorophyllous organisms that generally reproduce sexually and asexually. They are usually made up of filamentous, branched somatic structures which are typically surrounded by cell walls containing chitin or cellulose, or both of these substances. The fungi originated as a distinctive group …

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• 18 April

  An Introduction to Fungi

  

  A fungi is a group of eukaryotic heterotphic organisms members of which have chitinous cell wall and are differentiated from other living organisms by their special vegetative structure   and nutrient intake. Members of this group include yeast, rusts, mildews, molds, mushrooms etc. Mycology The discipline of bioscience that deals with …

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• 18 April

  Transpiration Mechanism in Plant Body

  

  Good to know A living cell can concentrate the solute, dead cell can’t. The suction pump can lift up to 34 ft in 1 atm pressure. Harry Cole tree was the highest plant up to 1988-89. Insoluble substances if added can not alter the osmotic potential. Only soluble substances can. …

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• 18 April

  Ascent of Sap

  

  The upward movement of water inside the plant is called ascent of sap. Pathway: Xylem. Prove that xylem is the pathway of ascent of sap. 1st experiment A leafy twig of balsum plant…………………………………………. 2nd experiment: Ringing experiment A leafy twig from a tree is cut……………………………………. Mechanism of ascent of sap …

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• 18 April

  Water Absorption by Plants

  

  Uptake of water by plants more specifically by plant root hair is called water absorption. It is a vital process in case of plants as uptaken water along with minerals are mandatory for the survival of the plant body. In case of lower plants, the whole body acts as water …

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