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Showing posts with label Class 8th Science. Show all posts
Showing posts with label Class 8th Science. Show all posts
Class 8th Science Chapter 2 Summary
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Micro Organisms:
By: Simple Science
Viruses:
By: Khan Academy
Class 8th Science Chapter 1 Notes
- In order to provide food to our growing population, we need to adopt certain agricultural practices.
- Same kind of plants grow and cultivated at a place constitute a crop.
- In India, crops can be broadly categorized into two types based on seasons - rabi and kharif crops.
- It is necessary to prepare soil by tilling and levelling, ploughs and levellers are used for this purpose.
- Sowing of seeds at appropriate depths and distances gives good yield. Good variety of seeds are sown after selection of healthy seeds. Sowing is done by seed drills.
- Soil needs replenishment and enrichment through the use of organic manure and fertilizers. Use of chemical fertilizers has increased with the introduction of new crop varieties.
- Supply of water to crops at appropriate intervals is called irrigation.
- Weeding involves removal of unwanted and uncultivated plants called weeds.
- Harvesting is the cutting of the manure crop manually or by machines.
- Separation of the grains from the chaff is called threshing.
- Proper storage of grains from the chaff is called threshing.
- Proper storage of grains is necessary to protect them from pets and microorganisms.
- Food is also obtained from animals for which animals are reared. This is called animal husbandry.
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