NCERT (Environment) Class-XII
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| EnvironmentDate Added: 2022-05-23 Consider the following: 1. Organisms 2. Populations 3. Communities 4. Biomes Ecology is concerned with which of the above mentioned biological organisations? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following: 1. Temperature 2. Water 3. Light 4. Soil: Which of the above factor influence formation of habitats? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The physico-chemical components alone do characterize the habitat of an organism completely. 2. The biotic components include pathogens, parasites, predators and competitors of the organism. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following: 1. Range of conditions 2. Diversity in the resources 3. Distinct functional role Which of the above aspects comprise the definition of niche? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The salt concentration is less than 5 parts per thousand in inland waters. 2. The organisms that can tolerate a wide range of salinities are called stenohaline. 3. Freshwater animals easily survive in sea water for long period. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Photosynthesis is only possible when sunlight is available. 2. Sunlight is also needed by some plants for photoperiodism. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following: 1. Foraging 2. Reproduction 3. Migration Which of the above plant activities are influenced by sunlight? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Temperature is the most important ecologically relevant environmental factor. 2. The thermal springs and deep-sea hydrothermal vents thrive at subzero levels in polar areas. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. All colour components of the visible spectrum are available for marine plants at different depths of the ocean. 2. The sediment-characteristics often determine the type of benthic animals that can thrive. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Composition 2. Grain size 3. pH 4. Mineral composition 5. Topography Which of the above characteristics of the soil influences types of vegetation and animals available? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Almost all birds and mammals are capable of thermoregulation and osmoregulation. 2. Nearly all plants cannot maintain a constant internal environment. 3. Aquatic animals and mostly all plants are conformers. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following: 1. Hibernation 2. Migration 3. Diapauses 4. Aestivation Which of the above mechanisms are adopted by animals to overcome stressful external conditions? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following: Which of the above are incorrectly matched? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The thickwalled spores in bacteria and fungi help them to survive unfavourable conditions. 2. The higher plants reduce their metabolic activity and go into dormancy state during stressful external conditions. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The kangaroo rat in Australia meets all its water requirements through its internal fat oxidation during lack of water. 2. The kangaroo rat has the ability to concentrate its urine. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements about desert plants: 1. They have a thick cuticle on their leaf surfaces to minimise water loss. 2. They have a special photosynthetic pathway (CAM) that enables their stomata to remain closed during the day time. 3. Some desert plants like Opuntia, have no leaves. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Thermoregulation is energetically expensive for animals like shrews and humming birds. 2. Heat loss or heat gain is a function of surface area. 3. Very small animals easily survive in polar regions. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Due to low atmospheric pressure of high altitudes, people experience altitude sickness. 2. The body compensates low oxygen availability by increasing red blood cell production. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Mammals from colder climates generally have shorter ears and limbs to minimise heat loss. 2. The blubber in seals acts as an insulator. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Cormorants in a wetland. 2. Rats in an abandoned dwelling. 3. Teakwood trees in a forest tract. 4. Lotus plants in a pond. Which of the above is/are considered as population in ecology? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following: 1. Pacific salmon fish 2. Bamboo 3. Birds4. Mammals Which of the above species breed only once in their lifetime? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Autotrophic plants need soil microbes to break down the organic matter in soil. 2. Interspecific interactions could be beneficial, detrimental or neutral for both species. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Natality refers to the number of deaths in the population during a given period. 2. Immigration refers to the number of births during a given period that are added to the initial density. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. In parasitism and predation both species benefit. 2. In amensalism one species is benefitted and the other is neither benefitted nor harmed. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The prickly pear cactus, an invasive species was controlled in Australia by a moth from its natural habitat. 2. Predators help in maintaining species diversity in a community. 3. In the American Pacific Coast the starfish Pisaster is an important predator. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The Abingdon tortoise in Galapagos Islands became extinct due to introduction of greater browsing goats. 2. The fitness of one species is significantly lower in the presence of another species in competition. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 The interaction between sea anemone and clown fish is an example of | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The human liver fluke on two intermediate hosts to complete its life cycle. 2. Cuscuta has lost its chlorophyll and leaves in the course of evolution. 3. The endoparasites live inside the host body at different sites Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The mycorrhizae are associations between fungi and cyanobacteria. 2. Commensalism confers benefits on both the interacting species. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 The cattle egret and grazing cattle in close association are example of | ||
| EnvironmentDate Added: 2022-05-23 'Brood parasitism' is found mostly in | ||
| EnvironmentDate Added: 2022-05-23 Parasites that feed on the external surface of the host organism are called | ||
| EnvironmentDate Added: 2022-05-23 The Gause's 'Competitive Exclusion Principle' is true if | ||
| EnvironmentDate Added: 2022-05-23 When a competing species is experimentally removed, the species whose distribution is restricted to a small geographical area will | ||
| EnvironmentDate Added: 2022-05-23 Consider the following : 1. Nicotine 2. Caffeine 3. Quinine 4. Strychnine Which of the above are used as defence mechanism by various plants? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Camouflage is the natural defence mechanism developed in the prey. 2. Some of the insects are known to be phytophagous in nature. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 The organisms that can tolerate and thrive in a wide range of temperatures are called | ||
| EnvironmentDate Added: 2022-05-23 The interacting species live closely together in | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Populations decline through emigrations. 2. When resources are unlimited, the growth pattern turns logistic. 3. The intrinsic rate of natural increase is a measure of the inherent potential of a population to grow. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The fig and wasp interaction is an example of plant-animal interactions. 2. The female wasp uses the developing seeds within the fruit for nourishing its larvae. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. An ecosystem is a functional unit of nature. 2. Ecosystem varies greatly in size from a small pond to a sea. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Forest, grassland and river are examples of terrestrial ecosystems. 2. Crop fields and aquarium are examples of man-made ecosystems. Which of the above mentioned statements is/are incorrect? | ||
| EnvironmentDate Added: 2022-05-23 Vertical distribution of different species occupying different levels is called | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The rate of biomass production is called Primary production. 2. Primary production is expressed in terms of weight (gm-2). Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Net Primary Productivity = Gross primary productivity + respiration losses. 2. Net primary productivity is the available biomass for the consumption to heterotrophs. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 In an ecosystem, the movement of energy towards the higher trophic levels is | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Environmental factors 2. Availability of nutrients 3. Photosynthetic capacity of plants Which of the above factor influence Primary productivity in a given area? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Leaching 2. Catabolism 3. Fragmenattion 4. Humification Which of the above are involved in the process of decomposition? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Detritivores break down detritus into smaller particles called catabolism. 2. Bacterial and fungal enzymes degrade detritus into simpler inorganic substances called fragmentation. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Humus undergoes decomposition at an extremely slow rate. 2. Humus is colloidal in nature and serves as a reservoir of nutrients. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Decomposition rate is slower if detritus is rich in nitrogen and water-soluble substances. 2. Temperature and soil moisture regulate decomposition. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 What amount of photosynthetically active radiation (PAR) is captured by plants? | ||
| EnvironmentDate Added: 2022-05-23 The rate of decomposition increases if | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The Second Law of thermodynamics does not apply to ecosystems. 2. Ecosystems need a constant supply of energy to synthesize the molecules they require. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Herbaceous and woody plants are major producers in terrestrial ecosystem. 2. Only green plants are called producers. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following: 1. Insects2. Birds 3. Mollusks4. Mammals Which of the above are categorized as herbivores? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Death of organism is the beginning of the detritus food chain/web. 2. Saprophytes meet their energy and nutrient requirements by degrading detritus. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. In terrestrial ecosystem, grazing food chain (GFC) is the major conduit for energy flow. 2. Based on their feeding habits organisms belong to different tropic levels. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The secondary consumer belongs to second trophic level. 2. The amount of energy decreases at successive trophic levels. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The biomass of a species is expressed in terms of fresh or dry weight. 2. The standing crop is mass of living material at a particular time in a trophic level. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 The ten per cent law is associated with | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The food relationship between organisms at different trophic levels is triangular shaped. 2. The base of each energy pyramid represents the tertiary or top level consumer. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. A given species may occupy more than one trophic level in the same ecosystem at the same time. 2. The trophic level represents a functional level. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Mostly herbivores are more in number and biomass than the carnivores. 2. The pyramid of biomass in sea is generally upright. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 The pyramid of energy is always | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements about ecological pyramids: 1. They take into account the same species belonging to two or more trophic levels. 2. The saprophytes are not given any place in ecological pyramids. 3. They do not accommodate a food web. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The community near equilibrium with the environment - seral community. 2. The entire sequence of communities that successively change in a given area - climax community. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 The gradual and fairly predictable change in the species composition of a given area is called | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The succession and evolution would have been parallel processes since life started on earth. 2. Succession is a process that starts in an area where no living organisms exist or become extinct. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Hydrarch succession takes place in wet areas. 2. Both hydrarch and xerarch successions lead to medium water conditions. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following : 1. Phytoplanktons, 2. Free-floating plants 3. Rooted-floating angiosperms 4. Trees Arrange the above mentioned stages of primary succession in water in chronological order | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Nutrient cycling is a movement of gases through the various components of an ecosystem. 2. The reservoir for sulphur and phosphorus cycle is located in the Earth's crust. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following: 1. Soil 2. Mositure 3. Ph 4. Temperature Which of the above factors influence the nutrient cycles? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Carbon constitutes 71 per cent of dry weight of organisms. 2. Oceans and fossil fuels are reservoirs of carbon. 3. Decomposers contribute substantially to carbon dioxide pool. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. It is a major constituent of biological membranes, nucleic acids and cellular energy transfer systems. 2. It is needed to make shells, bones and teeth. Which of the following elements has been described in above statements? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The phosphorous is obtained in the form of phosphates from rocks. 2. Decomposers release phosphorus in the atmosphere. 3. The respiratory release of phosphorus is less compared to that of carbon. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The atmospheric inputs of phosphorus through rainfall are larger than that of carbon. 2. The respiratory release of phosphorus into atmosphere is negligible. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements about ecosystem services: 1. The soil formation accounts for about 50 per cent of the total cost of various ecosystem services. 2. The cost of climate regulation and habitat for wildlife are about 6 per cent each. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Diversity in biosphere exists at all levels of biological organisation. 2. The Biodiversity is the variability among living organisms from all sources, including terrestrial, marine, and other aquatic ecosystems. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The Western Ghats have a greater amphibian species diversity than the Eastern Ghats. 2. Species biodiversity can be measured through taxonomic diversity. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements about composition of earth's biodiversity: 1. Plants comprise 50 percent of all the species recorded. 2. The insects are the most species-rich taxonomic group on earth. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. India is mega diverse country with 8.1% of global species diversity. 2. In India there are more species of animals than plants. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The diversity of plants and animals is unevenly distributed. 2. The species diversity increases from polar areas to tropics. 3. Latitudinal gradient has no effect on species diversity. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Tropical region is rich in diversity as compared to temperate region. 2. Temperate region is rich in diversity as compared to polar areas. 3. The tropical Amazonian rain forest has the greatest biodiversity on earth. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements about tropics: 1. The tropical latitudes had a long evolutionary time for species diversification. 2. Tropical environments are relatively more constant and predictable than others. 3. The amount of solar energy available. Which of the above are the reasons for rich diversity in tropics as compared to temperate? | ||
| EnvironmentDate Added: 2022-05-23 The relation between species richness and area for a wide variety of taxa is' | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. A biologically stable community must be either resistant or resilient to occasional disturbances. 2. Species richness is interrelated with biological stability. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: Which of the above is/are correctly matched? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The human intervention in tropical Pacific Islands lead to extinction of many species. 2. Amphibians are more vulnerable to extinction. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 The term 'Sixth Extinction' is | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The loss of biodiversity may decline productivity and increase pest and disease cycles. 2. 'The Evil Quartet' refers to the four major reasons for accelerated rates of species extinctions. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 The term 'lungs of the planet' is associated with | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The extent of tropical rain forests has been slightly increased as from previous decades. 2. The degradation of many habitats leads to extinction of species. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Overexploitation of marine resources may lead to extinction of some of them. 2. The Steller's sea cow and passenger pigeon are endangered due to overexploitation. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. All alien species turn invasive, and cause decline or extinction of indigenous species. 2. The Nile perch introduced in East Africa led to extinction of cichlid fish. 3. Parthenium, Lantana and Clarias gariepinus are examples of invasive weed species. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Entire forest is saved to save tigers in India, the approach is | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements about 'biodiversity hotspots': 1. They have high degree of endemism. 2. They could reduce the ongoing mass extinctions by almost 30 per cent. 3. They are regions of accelerated habitat loss. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following: 1. Western Ghats and Sri Lanka 2. Indo-Burma 3. Himalaya 4. Eastern Ghats and Andaman Which of the above are identified as biodiversity hotspot regions of the world? | ||
| EnvironmentDate Added: 2022-05-23 What is the total number of biodiversity hotspots in the world? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Sarguja, Chanda and Bastar areas of Madhya Pradesh 2. Khasi and Jaintia Hills in Meghalaya 3. Western Ghat regions of Karnataka and Maharashtra Which of the above mentioned areas is/are known for their sacred groves in India? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Biosphere Reserves 2. Zoological parks, 3. botanical gardens 4. National Parks Which of the above are part of Ex situ Conservation approach? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The Government of India has passed the Environment (Protection) Act in 1992. 2. Pollution is a change only in the chemical attributes of air, land, water or soil. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The harmful effects of air pollution depend on the concentration of pollutants duration of exposure. 2. The pollutants from smokestacks of thermal power plants and smelters can be filtered out. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 The electrostatic precipitator is associated with | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The particulate matter of size 2.5 micrometers or less in diameter are more harmful. 2. It is highly responsible for damaging lungs and premature deaths. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 According to the Central Pollution Control Board, the diameter of most harmful particulate matter for humans is: | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The platinum-palladium and rhodium metals are used in catalytic converters. 2. Lead in petrol inactivates the catalyst in vehicles equipped with catalytic converter. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The Air (Prevention and Control of Pollution) Act came into force in 1981. 2. The Water (Prevention and Control of Pollution) Act was passed in 1986. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The Biochemical Oxygen Demand (BOD) is a measure of the oxygen used by microorganisms to decompose this waste. 2. A mere 5.0 per cent impurities make domestic sewage unfit for human use. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Presence of large amounts of nutrients in waters leads to biomagnifications. 2. Algal bloom imparts a distinct colour to the water bodies. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Which of the following aquatic weed plant is called 'Terror of Bengal'? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The cumulative increase in the concentrations of a persistent substance is called bio-magnification. 2. It increases from higher to lower trophic levels. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 The persistent substance that disturb calcium metabolism in birds and leads to decline in their populations is | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Eutrophication is the enrichment of an ecosystem with chemical nutrients. 2. Eutrophication can be a natural process in lakes, occurring as they age through geological time. 3. Eutrophication is slowed by addition of pollutants from man's activities. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 The term 'Ecological sanitation' is associated with | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Sanitary landfills are open-burning dumps outside cities. 2. The solid waste should be categorized as bio-degradable, non- bio-degradable and recyclable. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Biodegradable waste2. E-waste 3. Hospital waste Which of the above items must be incinerated? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The nuclear energy is a non-polluting power source. 2. Accidental Leakage and safe disposal are the main issues with it. 3. At low doses, radiation is harmless to living beings. Which of the above mentioned statements is/are incorrect? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The increase in level of greenhouse gases has led to global warming. 2. Without greenhouse effect, the surface of earth will become more hot. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Which of the following are commonly known as greenhouse gases? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Odd Climatic pattern 2. Melting of glaciers 3. Increase in sea level 4. Droughts and floods Which of the above increasing events are related with global warming? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Using renewable energy sources 2. Afforestation 3. Reducing corps 4. Recycling Which of the above practices can help reduce the emission of greenhouse gases into the atmosphere? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. The thickness of the ozone is measured in Dobson units. 2. The ozone layer is thickest in Antarctica. 3. The ozone develops over Arctic during summer. Which of the above mentioned statements is/are incorrect? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. Ozone formation and destruction is a continuous process ongoing in stratosphere. 2. The chlorofluorocarbons (CFCs) are released during formation of ozone gas. Which of the above mentioned statements is/are correct? | ||
| EnvironmentDate Added: 2022-05-23 Consider the following: 1. Mutations in DNA 2. Skin Cancer 3. Snow-blindness 4. Cataract 5. Minamata Which of the above are the harmful effects of UV-B on human beings? | ||
| EnvironmentDate Added: 2022-05-23 The Montreal Protocol on substances that deplete the Ozone Layer was agreed in | ||
| EnvironmentDate Added: 2022-05-23 Consider the following statements: 1. More forests are lost in temperate regions of the world compared to tropics. 2. Reforestation may occur naturally in a deforested area. 3. Jhum cultivation helps in reforestation. Which of the above mentioned statements is/are incorrect? | ||