Bacteria are often maligned as the causes of human and animal disease (like this one‚ Leptospira‚ which causes serious disease in livestock). However‚ certain bacteria‚ the actinomycetes‚ produce antibiotics such as streptomycin and nocardicin; others live symbiotically in the guts of animals (including humans) or elsewhere in their bodies‚ or on the roots of certain plants‚ converting nitrogen into a usable form. Bacteria put the tang in yogurt and the sour in sourdough bread; bacteria help to break
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MATERIALS : METALS AND NON-METALS Y Iron Coal ou are familiar with a number of materials like iron‚ aluminium‚ copper‚ etc. Some materials have been given in Table 4.1. Table 4.1 : Appearance and Hardness of materials Object /Material Appearance Hardness (Shiny/Dull) (Very hard/ Not very hard) similar change if we try to beat a wood log ? Let us find out. Activity 4.1 Take a small iron nail‚ a coal piece‚ a piece of thick aluminium wire and a pencil lead. Beat the iron nail with
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Research 1. Assess evidence‚ which indicates increases in atmospheric concentration of oxides of sulfur and nitrogen. Thorough collection of data‚ surveys‚ and tests from the 1950’s indicate a rising trend in atmospheric concentrations of oxides of sulfur and nitrogen. An enhancement in funding‚ technological and information resources‚ has led to wider and more detailed analyses of oxides of sulfur and nitrogen concentrations‚ and as the diagrams indicate (see diagrams) there is a clear rise in
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INTRODUCTION Extracts from black pepper discourage insect pests from laying eggs on leaves and pose lower risk to humans and the environment than other pesticides‚ a University of Ottawa researcher says. The more susceptible species were pine sawflies‚ which are passed on ornamental plants and caterpillars such as the eastern tent caterpillar Black Pepper worked better when insects are soft-bodied during the larval stage because the chemical is able to penetrate
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precipitation generally has a pH less than 5and some times much lower depending upon the concentration of acidic components. Acidic deposition principally by the pollutant gases such as sulphur dioxide (so2) and the nitrogen oxides cause acidic deposition. The burning of fossil fuels‚ such as coal‚ forms Sulphur dioxide. that contain high quantities of sulphur; nitrogen oxides are contributed from various industrial activities and from car exhaust fumes. Acid rain is linked with damage to and death of forests
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Here is cbse 2007 question paper of science: CBSE X SCIENCE AND TECHNOLOGY (Theory) 2007 (OUTSIDE DELHI) Time allowed: 2 hours 15 mins; Maximum Marks: 100 General Instructions: | 1) | The question paper comprises of two sections A and B. You are to attempt both sections. | 2) | You are advised to attempt all the questions of Section A and Section B separately. | 3) | All questions are compulsory. | 4) | There is no overall choice. However‚ internal choice has been provided in some questions
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able to melt many metals‚ and non metals. As a solution‚ nitric acid is known as a good conductor of electricity. When combining ammonia and oxygen‚ water and nitrogen‚ it is known as nitric acid. The word equation of form nitric acid is nitrogen dioxide+ oxygen+ water nitric acid. The chemical equation for nitric acid is N02+ H20+ O2 HNO3. The balanced chemical equation for nitric acid is 4NO2
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Investigate the Effect of Acid Rain on Building Materials Question: What is the effect of 6M sulfuric acid (H2SO4) on the corrosion rate of the 3 grams of steel as the amount (number of sprays) of sulfuric acid increases? Variables: Independent variable: the number of sprays of 6M sulfuric acid (0‚ 5‚ 10‚ 15‚ 20‚ 25 times) to observe its effect on the corrosion rate. Each spray will contain about 10mL. Dependent variable: The corrosion rate. It will be calculated by measuring the mass of steel
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Investigatory Project CHAPTER 1 I. INTRODUCTION: Nowadays ‚people can’t oppose the boosting of the countless pests and insects that disturb our daily habits. Controlling of insects and pests is one of the main problems of most farmers and gardeners. So‚ instead of buying commercial and expensive inorganic insecticides‚ an alternative and economical insect repellant made up of the sap of euphorbia plant‚ garlic‚ and siling labuyo‚ all natural insecticides derived from different plants which
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What is APSA-80? APSA-80‚ a product of Amway is an all purpose spray adjuvant which on mixing with insecticides‚ fungicides‚ herbicides and defoliators increases their efficacy. As a result of that‚ the crops‚ fruits and vegetable are better protected from diseases‚ pests and unwanted herbs‚ resulting in more productive yield. This adjuvant has 80% of active ingredients and this can be mixed in any solution to improve its performance many times Note : APSA-80 is neither an insecticide nor a fertiliser
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