Improvement in Food Resources
CBSE · Class 9 · Science
Flashcards for Improvement in Food Resources — CBSE Class 9 Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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Get startedWhat are the three major groups of activities for improving crop yields?
Answer
The three major groups are: 1. Crop variety improvement - selecting better varieties through breeding and hybridisation 2. Crop production improvement - better farming practices including nutrient man…
Define hybridisation in crop improvement.
Answer
Hybridisation refers to crossing between genetically dissimilar plants to incorporate desirable characters into crop varieties. It can be: - Intervarietal (between different varieties) - Interspecific…
What are Kharif and Rabi crops? Give examples of each.
Answer
Kharif crops: Grown in rainy season (June to October) Examples: Paddy, soybean, pigeon pea, maize, cotton, green gram, black gram Rabi crops: Grown in winter season (November to April) Examples: Whea…
List the 16 essential nutrients required by plants and their sources.
Answer
Air: Carbon, Oxygen Water: Hydrogen, Oxygen Soil Macronutrients: Nitrogen, Phosphorus, Potassium, Calcium, Magnesium, Sulphur Soil Micronutrients: Iron, Manganese, Boron, Zinc, Copper, Molybdenum, Chl…
Compare manure and fertilizers in terms of their characteristics and effects.
Answer
Manure: - Contains organic matter - Supplies nutrients slowly - Improves soil structure and water retention - Environmentally friendly - Made from biological waste Fertilizers: - Commercially produce…
What is organic farming?
Answer
Organic farming is a farming system with minimal or no use of chemicals (fertilizers, herbicides, pesticides) and maximum input of: - Organic manures - Recycled farm wastes - Bio-agents (blue-green al…
Differentiate between mixed cropping and intercropping.
Answer
Mixed cropping: Growing two or more crops simultaneously on the same piece of land without a definite pattern Example: Wheat + gram, groundnut + sunflower Intercropping: Growing two or more crops sim…
What is crop rotation and what are its benefits?
Answer
Crop rotation is growing different crops on a piece of land in pre-planned succession. Benefits: - 2-3 crops can be grown per year - Prevents soil nutrient depletion - Breaks pest and disease cycles …
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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