Science · Class 9
Improvement in Food Resources
Crop varieties, animal husbandry, fish culture, and bee-keeping.
4 sections15–25 min read6 MCQs · 2 examples
Chapter Overview
Sustainable agriculture and animal husbandry meet India's food needs. Covers crop variety improvement, production practices, nutrient management, irrigation, cropping patterns, animal breeding, and fish production.
Crop Improvement
- Desirable traits: high yield, biotic/abiotic resistance, quality
- Methods: hybridisation, GM crops, tissue culture
- Macro nutrients: N, P, K; micro: Fe, Mn, Zn, Cu, B, Mo
Cropping Patterns
- Mixed cropping: two+ crops together (e.g. wheat + gram)
- Intercropping: rows of different crops
- Crop rotation: different crops on same land in sequence
Animal Husbandry
- Cattle: milk yield, disease resistance (cross-breeding)
- Poultry: broilers and layers
- Pisciculture: composite fish culture
- Bee-keeping (apiculture) for honey and wax
Solved Examples
Step-by-step solutions — read each step before checking the final answer.
Crop rotation benefit
Why rotate legumes with cereals?
- 1Legumes fix nitrogen via Rhizobium
- 2Replenishes soil nitrogen
- 3Reduces fertiliser need
Answer
Nitrogen fixation improves soil fertility
Hybridisation
What is hybridisation in crop improvement?
- 1Cross plants with desired traits
- 2Produce hybrids with combined qualities
- 3Example: high yield + pest resistance
Answer
Crossing varieties for better traits
Key Points to Remember
- ✓ Green Revolution increased food grain production
- ✓ Organic farming avoids synthetic chemicals
- ✓ Composite fish culture uses multi-layer feeders
Exam Tips
- • Know examples of Rabi and Kharif crops
- • List macro vs micro nutrients
- • Distinguish mixed, inter, and crop rotation
Practice MCQs — Improvement in Food Resources
Test your understanding with topic-wise multiple choice questions. Explanations appear after each answer.
Question 1 of 6Score: 0/0
Nitrogen-fixing bacteria in legumes: