Lakhmir Singh's Science For Class 8

Lakhmir Singh's Science For Class 8
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Lakhmir Singh's Science For Class 8

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Publisher: SChand Publications
ISBN: 9789352530243
Author:
Number of Pages: 361
Availability: In Stock
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or warranty with respect to the accuracy or completeness of the contents of this publication and are selling this publication on the condition and understanding that they shall not be made liable in any manner whatsoever. The publisher and the authors expressly disclaim all and any liability responsibility to any person, whether a purchaser or reader of this publication or not, in respect of anything and everything forming part of the contents of this publication. The publisher and authors shall not be responsible for any errors, omissions or damages arising out of the use of the information contained in this publication. Further, the appearance of the personal name, location, place and incidence, if any in the illustrations used herein is purely coincidental and work of imagination. Thus the same should in no manner be termed as defamatory to any individual.
Lakhmir Singh s Science Class 8
CONTENTS 1. CROP PRODUCTION AND MANAGEMENT
1 22
Types of Crops Kharif Crops and Rabi Crops Basic Practices of Crop Production Preparation of Soil Agricultural Implements
Plough, Hoe and Cultivator Sowing of Seeds and Transplanting Adding Manures and Fertilisers Crop Rotation Irrigation Sprinkler System and Drip System Removing the Weeds Harvesting and Storage of Food Grains Food from Animals
2. MICRO-ORGANISMS FRIEND AND FOE
23 42
Major Groups of Micro-organisms Bacteria, Viruses, Protozoa, Some Fungi and Algae Useful and Harmful Micro-organisms Diseasecausing Micro-organisms in Humans Carriers of Disease-causing Micro-organisms Housefly and Mosquito Disease-causing Microorganisms in Animals and Plants Food Poisoning and Preservation of Food Nitrogen Fixation and Nitrogen Cycle
3. SYNTHETIC FIBRES AND PLASTICS
43 58
Natural Fibres and Synthetic Fibres Polymers Types of Synthetic Fibres Rayon, Nylon, Polyester and Acrylic PET Characteristics of Synthetic Fibres Plastics Polythene, Polyvinyl Chloride PVC , Bakelite, Melamine and Teflon Types of Plastics Thermoplastics and Thermosetting Plastics Useful Properties of Plastics Biodegradable and Non-biodegradable Materials Plastics and Environment
4. MATERIALS METALS AND NON-METALS
59 80
Elements Types of Elements Metals, Non-metals and Metalloids Physical Properties of Metals and Non-metals Malleability, Ductility, Conductivity, Lustre, Strength, Sonorousness and Hardness Chemical Properties of Metals and Non-metals Reaction with Oxygen, Water,