Improvement in Food Resources — Flashcards
Gujarat Board · Class 9 · Science
22 flashcards for Improvement in Food Resources (Gujarat Board Class 9 Science) to test yourself on key terms and facts.
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What are the three major groups of activities for improving crop yields?
Answer
1. Crop variety improvement - selecting better varieties through breeding and genetic modification 2. Crop production improvement - better farming practices including nutrient management, irrigation, …
Define Kharif and Rabi seasons with examples of crops grown in each.
Answer
Kharif season: Rainy season crops grown from June to October Examples: Paddy, soybean, pigeon pea, maize, cotton, green gram, black gram Rabi season: Winter season crops grown from November to April …
What is hybridisation in crop improvement and what are its three types?
Answer
Hybridisation: Crossing between genetically dissimilar plants to incorporate desirable characteristics Three types: 1. Intervarietal - between different varieties 2. Interspecific - between two diffe…
List the 16 essential nutrients for plants and their sources.
Answer
From Air: Carbon, Oxygen From Water: Hydrogen, Oxygen From Soil: Macronutrients: Nitrogen, Phosphorus, Potassium, Calcium, Magnesium, Sulphur Micronutrients: Iron, Manganese, Boron, Zinc, Copper, Moly…
Compare manure and fertilizers in terms of composition, benefits, and effects on soil.
Answer
Manure: - Organic matter with small amounts of nutrients - Improves soil structure and water retention - Environmentally friendly, long-term soil fertility - Made from biological waste Fertilizers: -…
What is organic farming and what practices does it include?
Answer
Organic farming: Farming system with minimal or no use of chemicals, maximum use of organic inputs Practices include: - Use of organic manures and recycled farm waste - Bio-agents like blue-green alg…
Distinguish between mixed cropping, intercropping, and crop rotation.
Answer
Mixed cropping: Growing two or more crops simultaneously on the same land randomly (wheat + gram) Intercropping: Growing two or more crops simultaneously in definite row patterns (soybean + maize) C…
What are the four main types of irrigation systems used in India?
Answer
1. Wells - Dug wells and tube wells with pumps 2. Canals - Elaborate system with main canals, branch canals, and distributaries 3. River Lift Systems - Direct water drawing from rivers 4. Tanks - Smal…
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