Question 1

Question 3What are the advantages of inter-cropping and crop rotation?

Accepted Answer

Advantages of inter-cropping:Crops give better return.Spread of insect-pest is less.Weed infestation is less.Maintain soil health.Reduced need of fertilizers.Advantages of crop rotation:Prevents soil nutrition loss or replenishes nutrition.Maintains soil texture.Prevents infestation of weeds, insects and pests.Gives better return.

Web Content: Improvement in Food Resources | Bright Tutorials

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BRIGHT TUTORIALS
  BRIGHT TUTORIALSCBSE Class IX | Academic Year 2026-20279403781999Excellence in Education
  Science | Chapter 12: Improvement in Food ResourcesWeb Content &mdash; Quick Reference
  
    Chapter 12: Improvement in Food Resources &mdash; Quick Reference

crop improvement
      animal husbandry
      fish farming
      bee keeping
      manure
      fertiliser
      irrigation

Quick Revision Points
      
        Crop improvement: hybridisation (intervarietal, interspecific, intergeneric), GMOs
Macronutrients: N, P, K, Ca, Mg, S. Micronutrients: Fe, Mn, B, Zn, Cu, Mo, Cl
Manure (organic, humus, slow) vs Fertiliser (chemical, specific, fast)
Cropping: mixed (seeds mixed), inter (definite rows), rotation (successive seasons)
Cattle: milch (milk) vs draught (labour); Poultry: broilers (meat) vs layers (eggs)
Fish: marine (sea) vs inland (freshwater); Composite fish culture: 5-6 species together
Bee keeping: Apis cerana indica, Apis mellifera; depends on pasturage

Exam Tips for Chapter 12
      
        Read the detailed chapter notes for complete coverage of all NCERT topics.
        Practice all NCERT in-text and back exercise questions &mdash; they are frequently asked in exams.
        Focus on comparison tables, diagrams, and definitions &mdash; these are high-scoring areas.
        For numericals (if applicable), practice at least 20 problems of varying difficulty.
        Refer to the practice question bank (200+ questions) for thorough preparation.

Related Resources
      
        Detailed Notes: ch12-improvement-in-food-resources.html
        Practice Questions: 100+ questions with answers in 05-practice-questions/
        Chapter Test: 30-mark test paper in 06-tests/chapter-tests-30marks/
        Formula Sheet: Complete formula reference in 03-teacher-aid/formula-sheet.html

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Question 2

Question 4What is genetic manipulation? How is it useful in agricultural practices?

Accepted Answer

Genetic manipulation is a process in which genes of desirable characters are transferred from a plant to another plant by the technique of hybridisation. Genetic manipulation helps in obtaining desirable agronomic characters liked dwarfness in cereals, tallness and profuse branching in fodder crops. It is useful in developing varieties with higher yield, good quality, biotic and abiotic resistance, short maturity period, wider adoptability and other desirable agronomic characteristics.