Environmental Science MCQs

✅ The correct answer is option D.
The United States gets 81% of its total energy from oil, coal, and natural gas, all of which are fossil fuels. We depend on those fuels to heat our homes, run our vehicles, power industry and manufacturing, and provide us with electricity.

✅ The correct answer is option B.
For photosynthesis, presence of carbon dioxide, water, chlorophyll and sunlight is required. Only when these elements are present, can photosynthesis occur in plant. Plants use water to help break down carbon dioxide so its components can be combined with those in water to form sugar molecules.

✅ The correct answer is option B.
Symbiosis when the interaction is useful to both the populations.

✅ The correct answer is option A.
Vermicompost (vermi-compost, vermiculture) is the product of the decomposition process using various species of worms, usually red wigglers, white worms, and other earthworms, to create a mixture of decomposing vegetable or food waste, bedding materials, and vermicast.

✅ The correct answer is option B.
The ozone layer is mainly found in the lower portion of the stratosphere, from approximately 15 to 35 kilometers (9.3 to 21.7 mi) above Earth, although its thickness varies seasonally and geographically.

✅ The correct answer is option B.
The 3 R principle in waste management involvesReduce, Reuse and Recycle.

✅ The correct answer is option B.
A Lotic Ecosystem has flowing waters. Examples include: creeks, streams, runs, rivers, springs, brooks and channels. A Lentic Ecosystem has still waters. Examples include: ponds, basin marshes, ditches, reservoirs, seeps, lakes, and vernal / ephemeral pools.

✅ The correct answer is option B.
The process by which a species becomes fit to its survival in the environment is called adaptability. When the environmental factors change the organism has to adapt to its surrounding by changing its temperature or metabolism over a period of time, Hence adaptability is the result of natural selection.

✅ The correct answer is option B.
The microorganisms breakdown the complex compounds of dead protoplasm of producers and consumers absorb some of the decomposition products and release simple substances. The slow rate of decomposition of fallen logs in nature is due to their low moisture content The cellulose is in high amount in fallen logs.

✅ The correct answer is option D.
The dodo (Raphus cucullatus) is an extinct flightless bird that was endemic to the island of Mauritius, east of Madagascar in the Indian Ocean. The dodo’s closest genetic relative was the also-extinct Rodrigues solitaire, the two forming the subfamily Raphinae of the family of pigeons and doves.