CBSE Class 9 Biology Chapter 12 Improvement in Food Resources — 20 MCQs with Answers

Crop production management involves selecting the right variety, preparing soil, sowing at the correct time, providing adequate water and nutrients, and protecting the crop from pests and diseases. High-Yielding Varieties (HYV) are specially bred seeds that produce more grain per hectare than traditional varieties, but they require proper irrigation, fertilizers, and care. India's Green Revolution in the 1960s was built on HYV seeds like IR-8 rice and Sonalika wheat, which transformed the country from a food-importing nation to self-sufficient. Understanding HYV characteristics, their nutrient requirements, and the role of plant breeding is crucial for this section. These MCQs test both factual recall and application of concepts.

Irrigation is the artificial supply of water to crops when rainfall is insufficient or irregular. India has diverse irrigation systems: canal irrigation (surface water from rivers), well and tube-well irrigation (groundwater), sprinkler systems (water sprayed like rain, suitable for uneven land), and drip irrigation (water delivered directly to roots, most efficient). Drip irrigation saves 30-50 percent water compared to flood irrigation and is increasingly adopted in water-scarce regions like Rajasthan and Maharashtra. The 2025 CBSE exam often asks about the advantages and suitability of different irrigation methods for specific crops or terrains. These MCQs cover factual knowledge and application scenarios.

Healthy soil is the foundation of productive agriculture. Plants require macronutrients—Nitrogen (N), Phosphorus (P), and Potassium (K)—in large quantities, and micronutrients like Iron, Zinc, and Manganese in trace amounts. Nitrogen promotes leafy growth, Phosphorus aids root and seed development, and Potassium strengthens plants and improves disease resistance. Manures (organic matter like compost, farmyard manure) improve soil structure and add nutrients slowly. Chemical fertilizers (Urea, DAP) provide nutrients quickly but can degrade soil health if overused. Crop rotation, especially with legumes (which fix atmospheric nitrogen through root nodules), naturally replenishes soil fertility. These MCQs test understanding of nutrient roles, manure vs fertilizer, and sustainable practices.

Pests (insects, rodents) and diseases (caused by fungi, bacteria, viruses) can destroy 20-30 percent of crop production in India. Integrated Pest Management (IPM) is an eco-friendly approach combining cultural methods (crop rotation, removing infected plants), biological control (using natural predators like ladybird beetles), and judicious use of chemical pesticides only when necessary. Overuse of pesticides kills beneficial insects, pollutes soil and water, and causes pests to develop resistance. IPM balances effectiveness with environmental safety. The CBSE board exam frequently asks about IPM components, biological control examples, and the drawbacks of excessive pesticide use. These MCQs cover both conceptual understanding and real-world application.

Animal husbandry is the branch of agriculture concerned with the breeding, feeding, health care, and management of livestock—cattle, buffalo, goats, sheep, poultry, and fish. India is the world's largest milk producer (over 220 million tonnes annually), thanks to systematic dairy farming. Cattle breeds are classified into indigenous (Gir, Sahiwal, Red Sindhi—disease-resistant, adapted to Indian climate, moderate milk yield) and exotic (Jersey, Holstein—high milk yield but need cooler climate and intensive care). Crossbred cattle (indigenous × exotic) combine the advantages of both. Proper housing, balanced nutrition (green fodder, grains, supplements), regular vaccination, and breeding management are essential for profitable dairy farming. These MCQs test knowledge of cattle breeds, dairy management, and the importance of livestock in rural livelihoods.

Poultry farming involves raising chickens, ducks, and turkeys for eggs and meat. It is the fastest way to produce affordable animal protein with minimal land and water. Poultry breeds are classified into layers (egg-laying varieties like White Leghorn, producing 250-300 eggs per year) and broilers (meat varieties like Plymouth Rock, reaching market weight in 6-8 weeks). Good poultry management requires proper housing (ventilated, clean, temperature-controlled), balanced feed (grains, protein supplements, vitamins), regular vaccination, and disease monitoring. Poultry farming is popular among small and marginal farmers, especially women, due to low initial investment and quick returns. These MCQs assess understanding of poultry types, management practices, and nutritional benefits.

Fish is a rich source of protein, omega-3 fatty acids, vitamins, and minerals. India has diverse fishery resources—marine (sea fishing), inland (rivers, lakes), and aquaculture (controlled fish farming in ponds). Composite fish culture is a popular method where five or six fish species with different feeding habits are grown together in the same pond, maximizing space and nutrient use. For example, Catla feeds on surface, Rohu in middle water, and Mrigal and Common Carp at the bottom. This polyculture system yields 3-5 tonnes per hectare annually, much higher than monoculture. Proper pond management involves water quality monitoring, supplementary feeding, aeration, and disease control. These MCQs test knowledge of fish types, composite fish culture, and the importance of fisheries in food security.

Multiple-choice questions in CBSE Class 9 Biology papers typically carry 1 mark each, with 20-25 MCQs in the question paper. There is no negative marking in CBSE board exams, so you should attempt every question—but speed and accuracy matter. First, read the question stem carefully, noting keywords like 'NOT', 'EXCEPT', 'MOST', or 'LEAST'. These change the entire meaning. Second, eliminate obviously wrong options. Often two options are clearly incorrect, leaving you a 50-50 guess if needed. Third, recall NCERT terminology verbatim—CBSE questions are lifted directly from textbook language. For example, if the question asks about 'macronutrients', the correct answer will use NCERT terms like Nitrogen, Phosphorus, Potassium, not generic 'nutrients'. Fourth, manage time. Spend no more than 30-40 seconds per MCQ initially; mark tricky ones and return if time permits. Fifth, for assertion-reason type questions (common in CBSE), check both statements independently first, then check if the reason correctly explains the assertion. Sixth, avoid overthinking. The first instinct based on NCERT reading is often correct. Changing answers without strong reason usually leads to mistakes. Seventh, practice at least 100 MCQs from each chapter before the exam—pattern recognition improves speed and confidence. Finally, review incorrect answers after practice tests to understand why you went wrong. This chapter (Improvement in Food Resources) often has 2-3 MCQs in board papers, so mastering these 20 questions gives you a solid foundation.

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