UGC NET Environmental Science Mock - 5 - UGC NET MCQ

Non-renewable resources are found inside the earth and these took millions of years to form. These are difficult to get replenish. Examples are: Natural gas, fossil fuels, nuclear energy, oil, and coal. The rest of the resources is renewable sources.

Lichen are dual organisms which serves as symbiotic among fungus and alga or blue-green algae. This statement shows that option B is correct as Lichen are capable of initiating ecological succession on bare rock which serves as symbiotic association of algae and fungi and not of algae and bacteria, bacteria and fungi, fungi and mosses.

Photochemical smog occurs in warm, dry and sunny climate. The main components of the photochemical smog result from the action of sunlight on unsaturated hydrocarbons.

Photochemical smog has high concentration of oxidizing agents and is therefore called as oxidizing smog.

Autotrophic plants are the origin of the food chain as they produce food for the herbivores, who are in turn consumed by the carnivores and higher level of consumers and predators.

Coal power plants contributes mainly for atmospheric pollution and greenhouse gases which results in gaseous emissions of carbon dioxide, carbon monoxide leading to global warming and acid rain. These plants also result in particulate emissions from stacks of power plants. So with emission from coal combustion at thermal power plants particles such as fly ash, soot and other trace gas species occurs.

Both the statements are true but both the statements are unrelated. Hence, (R) is not the correct explanation of (A).

A network protocol is an established set of rules that determine how data is transmitted between different devices in the same network. Essentially, it allows connected devices to communicate with each other, regardless of any differences in their internal processes, structure or design.

Hence, The correct answer is D.

A trace element is an element whose concentration is less than 1000 ppm (0.1%) in a sample (rock, soil, or any natural product). ... Micronutrients – Micronutrients are elements that are needed by plants in small quantities (i.e., below 50 mg/g in the biomass).

Hence, The correct answer is B.

• Extension service
• Service of a public library

Hence, The correct answer is C.

Reduction of pH takes place when alum is added to the water because of formation of carbonic acid. Also increases permanent hardness.

Hence, The correct answer is D.

Encyclopedia

Hence, The correct answer is C.

Identification of problem is the first step in starting the research process.

Hence, The correct answer is C.

The biosphere encompasses the total weight of living material in a region or the globe.

Hence option D is correct

The oceans cover 71 percent of the Earth's surface and contain 97 percent of the Earth's water. Less than 1 percent of the Earth's water is fresh water, and 2-3 percent is contained in glaciers and ice caps. The oceans contain 99 percent of the living space on the planet.

Hence option C is correct.

But sometimes extinctions happen at a higher and a faster rate than usual. Factors such as over-exploitation, large body size, small population, massive habitat loss and position at a higher trophic level favor extinction. A plant podophyllum is at the verge of extinction due to over-exploitation.

Hence option A is correct.

One of the most intensive conservation efforts in India, Project Tiger was launched in 1973. It envisaged the setting up of tiger reserves to help in maintaining the population of tigers. As per estimates, the number of tigers was about 40,000 at the beginning of the 20th century.

Hence option A is correct.

Example for a bio-degradable polymer is Poly lactic acid.

Among widely used biodegradable polymers in biomedical applications, poly(lactic acid) (PLA) is becoming one of the most paramount polymers. Synthesizing PLA through melt/solution polycondensation polymerizations makes it relatively easy to tailor properties of final product.

Hence option C is correct.

Silent Spring is an environmental science book by Rachel Carson. The book was published on September 27, 1962, documenting the adverse environmental effects caused by the indiscriminate use of pesticides.

Hence option C is correct.

Tsunami is a Japanese word from a double root: tsu, meaning port or harbour, and nami, meaning wave.

Hence option B is the correct answer.

The dew point is the temperature to which air must be cooled to become saturated without changing the pressure.

Hence option B is the correct answer.

Littoral and swamp forests are found along the Andaman and Nicobar Islands and the delta area of the Ganga and the Brahmaputra in India. They have roots that consist of soft tissue which helps the plant to breathe in the water.

Hence option C is the correct answer.

Omnivores constitute the highest trophic level in an ecosystem. Omnivores are tertiary consumers and feed on both plants and animals. Decomposers feed on all the trophic levels.

Hence option C is the correct answer.

Example for a bio-degradable polymer is Poly lactic acid.

Among widely used biodegradable polymers in biomedical applications, poly(lactic acid) (PLA) is becoming one of the most paramount polymers. Synthesizing PLA through melt/solution polycondensation polymerizations makes it relatively easy to tailor properties of final product.

Hence option C is correct.

The worst nuclear accident to date was the Chernobyl disaster which occurred in 1986 in Ukraine. The accident killed 31 people directly and damaged approximately $7 billion of property.

Hence. The correct answer is A.

When the air temperature is equal to the dew point temperature, the air is at the saturation point and the relative humidity is 100%. The greater the difference between air temperature and dewpoint, the lower is the relative humidity.

Hence. The correct answer is B.

Abyssal zone in ocean has no sunlight but contains decomposers and consumers.

Hence. The correct answer is A.

Agenda 21 is a non-binding action plan of the United Nations with regard to sustainable development. It is a product of the Earth Summit (UN Conference on Environment and Development) held in Rio de Janeiro, Brazil, in 1992.

Hence. The correct answer is B.

The strongest radiation inversions occur when skies are clear.

Hence. The correct answer is C.