Combustion oxidizes organic matter to CO₂ and H₂O, releasing heat and reducing volume. It also produces ash and flue gases that must be controlled. Redox occurs chemically, but the dominant process is oxidation. ---

Plants require these elements in trace (micro) amounts for enzyme function and growth. Macronutrients include N, P, K, Ca, Mg, S. “Soil vitamins” is informal and not standard terminology. ---

Chronic arsenicosis produces hyperpigmentation (diffuse melanosis) and keratosis, especially on palms and soles. It arises from long-term exposure, often via contaminated groundwater. Early detection and safe water mitigate risks. ---

Energy is the ability to perform work or produce change. Power is the rate of doing work, and force is an interaction causing acceleration. Strength is a material or muscular property, not a physical quantity of work capacity. ---

Illegal wildlife trade targets bear gall bladders for traditional medicines. Skins and other parts are also traded, but gall bladders are especially lucrative. This poaching contributes to population declines. ---

Rising CO₂ intensifies the greenhouse effect, leading to global warming. “Greenhouse effect” is the mechanism; “global warming” is the temperature rise outcome. CO₂ largely increases from fossil fuel combustion and land-use change. ---

Herpetology covers reptiles and amphibians. Ichthyology studies fishes, ornithology studies birds, and mammalogy studies mammals. The field includes behavior, ecology, and conservation. ---

Sciophytes are shade-loving plants adapted to low light, often with larger, thinner leaves and lower light compensation points. Heliophytes prefer full sun. Epiphytes grow on other plants, and oxylophytes prefer acidic soils. ---

Algal blooms are a **symptom and driver** of eutrophication—nutrient enrichment of waters. Blooms deplete oxygen upon decay, causing fish kills and biodiversity loss. They can also produce toxins harmful to humans and wildlife. --- Here is your full list of **MCQs** formatted as per your preferred structure — with **correct answers** and **explanations**. --- ### **1. Causative organisms of Malaria** **Options:** a) Bacteria b) Virus c) Parasitic organism _Plasmodium_ d) Fungi **Correct Answer:** **c) Parasitic organism _Plasmodium_** **Explanation:** Malaria is caused by a protozoan parasite of the genus _Plasmodium_, transmitted by female _Anopheles_ mosquitoes. --- ### **2. What is a Carcinogen?** **Options:** a) Drugs for curing infectious diseases b) Antibiotics c) Cancer-causing agent d) Immunity booster **Correct Answer:** **c) Cancer-causing agent** **Explanation:** A carcinogen is any substance, organism, or agent that promotes the formation of cancer. --- ### **3. Largest preventable cause of cancer** **Options:** a) Tobacco smoking and chewing b) Egg consumption c) Air pollution d) Alcohol **Correct Answer:** **a) Tobacco smoking and chewing** **Explanation:** Tobacco use (smoking and chewing) is the single largest preventable cause of cancer worldwide. --- ### **4. What is Bagasse? What is it used for?** **Options:** a) Sugarcane waste – to make paper b) Vegetable waste – for compost c) Liquid waste – as fertilizer d) Animal dung – for biogas **Correct Answer:** **a) Sugarcane waste – to make paper** **Explanation:** Bagasse is the fibrous residue left after extracting juice from sugarcane. It's widely used to make paper and biofuel. --- ### **5. What is Deep Ecology?** **Options:** a) Protecting nature for its own sake b) Protecting forests for humans c) Ecology of forest d) Technology in ecology **Correct Answer:** **a) Protecting nature for its own sake** **Explanation:** Deep ecology is an environmental philosophy that recognizes the inherent worth of all living beings regardless of their utility to humans. --- ### **6. The inherent ability of organisms to reproduce and multiply is called:** **Options:** a) Repetition b) Biotic potential c) Carrying capacity d) None **Correct Answer:** **b) Biotic potential** **Explanation:** Biotic potential is the maximum reproductive capacity of an organism under optimal environmental conditions. --- ### **7. Birth rate is called:** **Options:** a) Mortality b) Vital index c) Natality d) None **Correct Answer:** **c) Natality** **Explanation:** Natality is the birth rate—number of births per unit of population over time. --- ### **8. Photochemical smog is also called:** **Options:** a) Tokyo smog b) London smog c) Los Angeles smog d) None **Correct Answer:** **c) Los Angeles smog** **Explanation:** Photochemical smog, typical of urban areas with high sunlight and vehicle emissions, is nicknamed “Los Angeles smog.” --- ### **9. The combustion of waste in the absence of oxygen is called:** **Options:** a) Haemolysis b) Pyrolysis c) Hydrolysis d) None **Correct Answer:** **b) Pyrolysis** **Explanation:** Pyrolysis is the thermal decomposition of materials at high temperatures in the absence of oxygen. --- ### **10. What is NIHL?** **Options:** a) Noise-induced hearing loss b) Water pollution c) Air pollution d) None **Correct Answer:** **a) Noise-induced hearing loss** **Explanation:** NIHL refers to hearing damage caused by prolonged exposure to high levels of noise. --- ### **11. What is deforestation?** **Options:** a) Product of forest b) Destruction of forest c) Forest protection d) None **Correct Answer:** **b) Destruction of forest** **Explanation:** Deforestation is the removal or clearing of forested land, usually for agriculture or urban development. --- ### **12. Killing of animals disturbs:** **Options:** a) Good for ecosystem b) Good for man c) The balance of nature d) None **Correct Answer:** **c) The balance of nature** **Explanation:** Killing of animals disrupts food chains and ecological balance, leading to biodiversity loss. --- ### **13. Deforestation generally decreases:** **Options:** a) Global warming b) Drought c) Soil erosion d) Rainfall **Correct Answer:** **d) Rainfall** **Explanation:** Deforestation reduces transpiration and cloud formation, leading to decreased rainfall over time. --- ### **14. What is meant by Oceanography?** **Options:** a) Study of marine habitat b) Study of freshwater c) Study of soil d) None **Correct Answer:** **a) Study of marine habitat** **Explanation:** Oceanography is the scientific study of oceans, including marine organisms, currents, and ecosystems. --- ### **15. North American grasslands are called:** **Options:** a) Pampas b) Prairies c) Savannah d) None **Correct Answer:** **b) Prairies** **Explanation:** Prairies are temperate grasslands found in North America. --- ### **16. African grasslands are called:** **Options:** a) Prairies b) Pampas c) Savannah d) None **Correct Answer:** **c) Savannah** **Explanation:** Savannahs are tropical grasslands with scattered trees found mainly in Africa. --- ### **17. Green plants are absent in deep sea. Why?** **Options:** a) Light is absent b) High pressure c) Low temperature d) Great depth **Correct Answer:** **a) Light is absent** **Explanation:** Photosynthesis cannot occur in the deep sea due to the absence of sunlight, which green plants require. --- ### **18. What is desertification?** **Options:** a) Conversion of forest into desert b) Conversion of cropland into desert c) Conversion of grassland into desert d) All of the above **Correct Answer:** **d) All of the above** **Explanation:** Desertification is the degradation of land in arid areas due to deforestation, overgrazing, and poor land management. --- ### **19. Infection of HIV is usually detected by which test?** **Options:** a) ELISA test b) Hybridization c) Gram staining d) None **Correct Answer:** **a) ELISA test** **Explanation:** The ELISA (Enzyme-Linked Immunosorbent Assay) is a standard test used to detect HIV antibodies in blood. --- Here is your latest set of MCQs formatted with **options, correct answers**, and **explanations**—as per your preferred style. This can be considered **Set-9**. --- ### **1. The first global environmental protection treaty, “The Montreal Protocol,” was signed on September 26,** **Options:** a) 1985 b) 1990 c) 1981 d) 1987 **Correct Answer:** **d) 1987** **Explanation:** The Montreal Protocol was signed on September 26, 1987, to phase out substances that deplete the ozone layer, including CFCs. --- ### **2. The basic unit of the biosphere is:** **Options:** a) Biome b) Biotope c) Medium d) None **Correct Answer:** **a) Biome** **Explanation:** A biome is a large ecological area on the Earth’s surface with flora and fauna adapting to their environment; it is considered the basic unit of the biosphere. --- ### **3. The excessive greenhouse effect is referred to as:** **Options:** a) Acid rain b) Global warming c) Air pollution d) None **Correct Answer:** **b) Global warming** **Explanation:** An enhanced greenhouse effect leads to global warming—an increase in Earth's average surface temperature. --- ### **4. The "Use and Disuse" theory was proposed by:** **Options:** a) Lamarck b) Stebbins c) Darwin d) Dobzhansky **Correct Answer:** **a) Lamarck** **Explanation:** Jean-Baptiste Lamarck proposed that traits used more frequently become stronger, and those not used diminish over generations. --- ### **5. The heating of Earth’s atmosphere due to trapped radiation is known as:** **Options:** a) Global warming b) Glass-house effect c) Thermal effect d) Greenhouse effect **Correct Answer:** **d) Greenhouse effect** **Explanation:** Greenhouse gases trap infrared radiation from Earth, warming the atmosphere—a phenomenon known as the greenhouse effect. --- ### **6. The ozone hole was first observed on:** **Options:** a) Antarctica b) Africa c) America d) Australia **Correct Answer:** **a) Antarctica** **Explanation:** The ozone hole was first detected over Antarctica in the early 1980s, largely due to the accumulation of CFCs. --- ### **7. Heating of the atmosphere by radiation accelerates the process of:** **Options:** a) Condensation b) Rain formation c) Precipitation d) Evaporation **Correct Answer:** **d) Evaporation** **Explanation:** Increased atmospheric heating raises surface temperatures, accelerating the evaporation of water bodies. --- ### **8. Which among the following results in the formation of soil?** **Options:** a) Radiation b) Weathering c) Erosion d) Pollution **Correct Answer:** **b) Weathering** **Explanation:** Weathering of rocks by physical, chemical, and biological processes is the primary cause of soil formation. --- ### **9. Animals and plants are best protected in:** **Options:** a) Zoos b) Botanical Gardens c) National Parks d) Sanctuaries **Correct Answer:** **c) National Parks** **Explanation:** National Parks provide in situ conservation—protecting animals and plants in their natural habitat. --- ### **10. The first trophic level in a food chain is occupied by:** **Options:** a) Green plants b) Herbivores c) Carnivores d) Bacteria **Correct Answer:** **a) Green plants** **Explanation:** Producers like green plants form the first trophic level by converting solar energy into chemical energy through photosynthesis. --- ### **11. Organisms that generate energy using light are:** **Options:** a) Oligotrophs b) Chemoorganotrophs c) Chemolithotrophs d) Photoautotrophs **Correct Answer:** **d) Photoautotrophs** **Explanation:** Photoautotrophs (like plants, algae, and cyanobacteria) use sunlight to synthesize food from CO₂ and water. --- ### **12. Land use and land cover pattern is usually studied by the technique:** **Options:** a) Aerial photography b) Satellite imaging c) Satellite imaging and GIS d) Satellite imaging, GIS, and GPS **Correct Answer:** **d) Satellite imaging, GIS, and GPS** **Explanation:** Modern land use studies integrate satellite data with GIS (Geographic Information Systems) and GPS (Global Positioning Systems) for precise monitoring and analysis. --- ### **13. Which one of the following does not contribute to conservation of water?** **Options:** a) Waste water treatment b) Wasteland development c) Watershed protection d) Rainwater harvesting **Correct Answer:** **b) Wasteland development** **Explanation:** Wasteland development focuses on reclaiming degraded land rather than conserving water directly. --- ### **14. The use of microorganism metabolism to remove pollutants such as oil spills in water bodies is known as:** **Options:** a) Detoxification b) Bioremediation c) Biodegradation d) Phytoremediation **Correct Answer:** **b) Bioremediation** **Explanation:** Bioremediation involves using microbes to degrade and remove environmental pollutants, including oil spills. ---

CO₂, CH₄, and N₂O absorb infrared radiation, warming the atmosphere. They differ in lifetimes and global warming potentials. Managing all three is vital for climate mitigation. ---