Скачать или смотреть Crop Variety Improvement | Class 9th Science | Chapter 12 Improvement in Food Resources

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What's Food Resources


This approach depends on finding a crop variety that can give a good yield.
Varieties or strains of crops can be selected by breeding for various useful characteristics such as disease
Disease resistance,
Response to fertilisers,
Product quality and
High yields.
One way of incorporating desirable characters into crop varieties is by hybridisation.
Hybridisation refers to crossing between genetically dissimilar plants.
This crossing may be
Intervarietal (between different varieties),
Interspecific (between two different species of the same genus) or
Intergeneric (between different genera).
Another way of improving the crop is by introducing a gene that would provide the desired characteristic.
This results in genetically modified crops.
For new varieties of crops to be accepted, it is necessary that the variety produces high yields under different conditions that are found in different areas.
Farmers would need to be provided with good quality seeds of a particular variety.
Cultivation practices and crop yield are related to weather, soil quality and availability of water.
Weather conditions such as drought and flood situations are unpredictable, varieties that can be grown in diverse climatic conditions are useful. .