NCERT Class 9 Science Chapter 12 – Improvement in Food Resources

NCERT Class 9 Science Chapter 12 explains scientific methods used to increase food production through crop management, animal husbandry and modern agricultural practices. NCERT Class 9 Science Chapter 12 builds strong conceptual clarity about food security, sustainable agriculture and biological resource management.

The chapter discusses crop variety improvement, nutrient management, irrigation methods, cropping patterns and crop protection techniques. It highlights the impact of the Green Revolution (1960s) in India and the development of high-yielding varieties under agricultural scientists like Dr. M.S. Swaminathan.

NCERT Class 9 Science Chapter 12 also explains animal husbandry practices including cattle farming, poultry farming, fisheries and apiculture. It introduces biotechnology-based improvements such as Bt cotton, tissue culture and biofertilisers.

These concepts are essential for understanding agriculture, environment and applied biology in higher classes and competitive examinations.

For structured preparation of NCERT Class 9–12 for UPSC, BPSC and State PCS examinations, strengthen your basics with our complete NCERT Book Notes PDF for Class 9-12, available inside the NCERT foundation course level-2.

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1. Introduction

• India has a large population, and ensuring food security requires improvement in food production.
• The increase in food production began significantly during the Green Revolution (1960s) in India.
• Improvement in food resources involves better crop production, animal husbandry, fisheries and biotechnology.
• Scientific management of agriculture increases both yield and quality.
• Main crops are classified as cereals, pulses, oilseeds, fruits and vegetables.

2. Crop production management

• Crop yield depends on variety, nutrients, irrigation and protection from pests.
• Agricultural practices include preparation of soil, sowing, adding manure and fertilisers, irrigation, protection and harvesting.
• Crops are classified as Kharif and Rabi crops.
• Kharif crops sown in June–October, example: Paddy, Maize, Cotton.
• Rabi crops sown in October–March, example: Wheat, Gram, Mustard.

3. Crop variety improvement

• Involves selecting plants with desired traits.
• Objectives include higher yield, disease resistance, early maturity and better quality.
• Hybridisation combines desirable characters.
• Genetic engineering introduces specific genes.
• Example: High-yielding wheat varieties developed by Dr. M.S. Swaminathan in India.

4. Nutrient management

• Plants require macronutrients and micronutrients.
• Macronutrients include Nitrogen, Phosphorus, Potassium, Calcium, Magnesium and Sulphur.
• Micronutrients include Iron, Zinc, Manganese, Copper, Boron, Molybdenum.
• Manure improves soil structure and fertility.
• Fertilisers provide specific nutrients like Urea (Nitrogen).

5. Irrigation

• Irrigation ensures adequate water supply.
• Methods include Canal system, Wells, Tubewells, River lift system.
• Modern methods include Sprinkler and Drip irrigation.
• Drip irrigation reduces water wastage.
• Rainfall in India mainly from South-West Monsoon.

6. Cropping patterns

• Mixed cropping – Growing two or more crops together.
• Intercropping – Growing crops in definite row patterns.
• Crop rotation – Growing different crops sequentially.
• Improves soil fertility and reduces pest attacks.

7. Crop protection management

• Weeds reduce crop yield.
• Weeds controlled by manual removal or weedicides like 2,4-D.
• Pests include insects, rodents and fungi.
• Use of pesticides and biological control methods.
• Proper storage prevents loss due to moisture and pests.

8. Harvesting and storage

• Harvesting done manually or by combine harvesters.
• Crops dried before storage to prevent fungal growth.
• Storage structures include silos and granaries.
• Government agencies like Food Corporation of India (FCI) manage storage.

9. Animal husbandry

• Scientific management of domestic animals for food and other products.
• Includes cattle farming, poultry farming, fisheries and bee-keeping.
• Focus on breeding, feeding and disease control.

10. Cattle farming

• Two purposes: Milk production (dairy farming) and draught labour.
• Indigenous breeds: Sahiwal, Red Sindhi.
• Exotic breeds: Jersey, Brown Swiss.
• Balanced diet improves milk yield.
• Artificial insemination improves breeds.

11. Poultry farming

• Provides eggs and meat.
• Improved varieties produce more eggs.
• Proper housing and vaccination necessary.
• Broilers raised for meat, layers for eggs.

12. Fisheries

• Involves production of fish from water bodies.
• Marine fisheries operate in seas like Arabian Sea and Bay of Bengal.
• Inland fisheries include rivers, ponds and reservoirs.
• Fish culture called pisciculture.
• Composite fish culture involves multiple species.

13. Bee-keeping

• Also called apiculture.
• Provides honey and beeswax.
• Common species: Apis cerana indica.
• Increases pollination and crop yield.

14. Biotechnology in agriculture

• Involves use of modern techniques for crop improvement.
• Genetic engineering produces pest-resistant crops.
• Example: Bt cotton resistant to bollworm.
• Tissue culture used for rapid plant propagation.
• Biofertilisers improve soil fertility naturally.

15. Sustainable agriculture

• Focus on long-term soil fertility.
• Use of organic farming.
• Reduced chemical fertilisers.
• Integrated pest management.
• Conservation of water resources.

16. Conclusion

• Improvement in food resources essential for growing population.
• Scientific crop production increases yield.
• Animal husbandry contributes to food and income.
• Fisheries and biotechnology enhance productivity.
• Sustainable practices ensure environmental balance.

17. Exam oriented facts

• Green Revolution (1960s) – Increased wheat and rice production in India.
• Kharif crops – Sown June–October.
• Rabi crops – Sown October–March.
• Macronutrients – Nitrogen, Phosphorus, Potassium.
• Drip irrigation – Water-efficient method.
• Sahiwal breed – Indigenous dairy cattle.
• Apis cerana indica – Indian honeybee species.
• Bt cotton – Genetically modified pest-resistant crop.
• Mixed cropping – Two crops grown together.
• Crop rotation – Sequential cropping for soil fertility.

Understanding NCERT Class 9 Science Chapter 12 is essential for linking biology with real-life agricultural production and food security.

This chapter forms the base for higher topics such as plant breeding, biotechnology, sustainable agriculture and environmental management.

For school examinations, students must focus on cropping seasons (Kharif and Rabi), macronutrients and micronutrients, irrigation methods, animal husbandry practices and biotechnology applications.

For competitive examinations like NEET and agricultural entrance tests, NCERT Class 9 Science Chapter 12 provides fundamental clarity about crop improvement, food production systems and biological resource management.

This completes NCERT Class 9 Science. Students can now revise all chapters systematically for strong conceptual foundation and competitive preparation.

FAQs

Q1. What is NCERT Class 9 Science Chapter 12 about?
It explains scientific methods for improving food production through crop management, animal husbandry, fisheries and biotechnology.

Q2. What are Kharif and Rabi crops?
Kharif crops are grown during the monsoon season (June to October), while Rabi crops are grown during the winter season (October to March).

Q3. What is the Green Revolution?
The Green Revolution refers to the agricultural transformation in the 1960s that increased food production in India through high-yielding varieties and modern farming techniques.

Q4. What is Bt cotton?
Bt cotton is a genetically modified crop that contains a gene from Bacillus thuringiensis, making it resistant to certain insect pests.

Q5. Why is NCERT Class 9 Science Chapter 12 important for competitive exams?
It builds foundational knowledge about agriculture, biotechnology and sustainable resource management, which are important topics for medical and agricultural entrance examinations.

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