CBSE Class 9 Science
Question 9 of 9
Improvement in Food Resources — Question 1
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Question Question 1
Compare the use of manure and fertilizers in maintaining soil fertility.
| Manure | Fertilizers |
|---|---|
| Consists of large quantity of organic matter. | Consists of compounds containing nutrient and no organic matter. |
| Supplies small quantities of nutrients to the soil. | Supplies large quantity of nutrient to the soil. |
| Prepared by the decomposition of animal excreta and plant waste; some times green plants. | Commercially produced plant nutrients. |
| The bulk of organic matter in manure helps in improving the soil structure, water holding capacity and fertility. | It can hamper soil structure and fertility if not used in optimum amount. |
| They do not affect pH of soil. | They can make the soil acidic or alkaline. |
| They do not cause pollution. | They cause air pollution during their manufacture and water pollution when used excessively in fields. |
| Examples: Compost, Green manure | Example: Urea, SSP |
BRIGHT TUTORIALS
BRIGHT TUTORIALS
CBSE Class IX | Academic Year 2026-2027
9403781999
Excellence in Education
Science | Chapter 12: Improvement in Food ResourcesWeb Content — Quick Reference
Chapter 12: Improvement in Food Resources — Quick Reference
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