CBSE Class 9 Biology Crop Improvement

• why is weedicides important  
• Is Intercroping supirior to mixed cropping?
• With diagram explain various processes in tissue culture
  
• what is harvedting
• mention the preventive and control measure used before grain are stored?  
• "Ration of crop also help in pest control." What is meant by ration of crop?
• What are the objectives of crop variety improvement 
• raw mango pieces are sprinkled with salt before pickling  
• Enlist some factors for which variety improvement is done in plants.
• Compare fertilizers and manures.

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