Questions
2–4 questions in biology sections
Difficulty
Easy
Importance
Low weightage but easy marks
Overview
Improvement in Food Resources explores the agricultural and animal husbandry practices required to achieve food security in a growing population. It focuses on scientific approaches to maximizing yield through crop variety, protection, and systematic livestock management. This topic is essential for conceptual clarity in biology and environmental science sections.
Crop Production Improvement
Crop improvement focuses on increasing yield through genetic manipulation and effective farming practices. Understanding the selection criteria for seeds and the cycle of crop growth is vital for answering production-related questions.
- Hybridization involves crossing genetically dissimilar plants
- Genetically Modified Crops (GMC) introduce specific desired genes
- Photoperiods relate plant growth to sunlight duration
- Kharif crops: June to October (monsoon)
- Rabi crops: November to April (winter)
Manures and Fertilizers
Soil fertility is maintained by adding external nutrients, categorized into manures (organic) and fertilizers (inorganic). The distinction between their long-term impact on soil health is a frequent examination focus.
- Compost is prepared from organic waste and excreta
- Vermicompost uses earthworms for faster decomposition
- Green manure consists of leguminous plants plowed into soil
- Fertilizers provide specific nitrogen, phosphorus, and potassium (NPK)
- Excessive fertilizer use causes water pollution and soil degradation
Crop Protection Management
To prevent pre-harvest and post-harvest losses, crops must be protected from weeds, pests, and diseases. Control methods emphasize integrated strategies rather than sole reliance on chemicals.
- Weeds compete for nutrients, light, and space
- Pesticides include herbicides, insecticides, and fungicides
- Preventive measures: seed treatment and resistant varieties
- Biotic factors: insects, rodents, and fungi
- Abiotic factors: moisture, temperature, and humidity
Animal Husbandry
This subtopic covers the scientific management of livestock, including cattle, poultry, and fish farming. Key concepts involve balancing nutritional needs with disease control and high-yield breed selection.
- Cattle farming focuses on milk production (milch) and labor (draught)
- Poultry farming involves egg and meat production (broilers vs layers)
- Marine fisheries include capture and culture fisheries
- Composite fish culture uses multiple species in one tank
- Apiary management focuses on honey production and pollination
Formula Sheet
NPK ratio representation
Crop rotation index calculation
Exam Tip
Focus on the environmental impact difference between fertilizers and manures, as examiners frequently use this for comparison-based questions.
Common Mistakes
- Confusing the specific roles of Macro-nutrients and Micro-nutrients in soil
- Failing to distinguish between capture fisheries and culture fisheries
- Misclassifying common crops between Kharif and Rabi seasons
More Revision Notes
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