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Improvement in Food Resources — Question 5

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Question 5

How do storage grain losses occur?

Answer

During the storage of grains both biotic and abiotic factors cause losses to the grain. Biotic factors such as insects, rodents, mites, fungi etc. and various abiotic factors such as moisture, temperature, lack of sunlight, etc. are responsible for losses of grains. These factors cause loss in weight, degradation in quality and poor germination rate.

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Science | Chapter 12: Improvement in Food ResourcesWeb Content — Quick Reference

Chapter 12: Improvement in Food Resources — 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 — they are frequently asked in exams.
  • Focus on comparison tables, diagrams, and definitions — 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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