Environmental Engineering

371. The lower limit of water availability is soil is known as

  1. field capacity
  2. Hypolimnion
  3. thermocline
  4. wilting point

Correct answer: (D)
wilting point

372. The main atmospheric layer near the surface of earth is

  1. troposphere
  2. mesophere
  3. ionosphere
  4. stratosphere

Correct answer: (A)
troposphere

373. The maintenance of relatively constant internal environment is called

  1. Homeostasis
  2. Exotherms
  3. Homeobox
  4. Endotherms

Correct answer: (A)
Homeostasis

374. The major pollutant from automoblie exhaust is

  1. NO
  2. CO
  3. SO2
  4. Soot

Correct answer: (B)
CO

375. The most important human activity, leading to the extinction of wildlife, is

  1. Pollution of wildlife, is
  2. Hunting for valuable wildlife products
  3. Introduction of alien species
  4. Alternation and destruction of the natural habitats

Correct answer: (D)
Alternation and destruction of the natural habitats

376. The most important reason for decrease in biodiversity is

  1. habitat pollution
  2. introduction of exotic species
  3. over-exploitation
  4. habitat destruction

Correct answer: (D)
habitat destruction

377. The occurrence of pesticides like DDT in higher trophic levels is termed as

  1. bioremediation
  2. biomagnification
  3. biological enhancement
  4. biopollution

Correct answer: (B)
biomagnification

378. The order of basic processes involved in succession is

  1. Nudation->Invasion-> competition and co action->reaction->stabilization
  2. Nudation->stabilization-> competition and co action->Invasion->reaction
  3. Invasion-> Nudation->competition and co action->Reaction->stabilization
  4. Invasion->stabilization-> competition and co action->Reaction->nudation

Correct answer: (A)
Nudation->Invasion-> competition and co action->reaction->stabilization

379. The order of succession in a hydrosere is

  1. Rooted aquatic plants-> phytoplankton->Free floating stage->Reed swamp stage->Sedge Meadow stage-> wood land stage-> Climax forest
  2. Rooted aquatic plants-> phytoplankton->Free floating stage-> Sedge Meadow stage-> Reed swamp stage-> wood land stage-> Climax forest
  3. phytoplankton->Rooted aquatic plants->Free floating stage->Reed swamp stage-> wood land stage-> Sedge Meadow stage-> Climax forest
  4. phytoplankton->Rooted aquatic plants->Free floating stage->Reed swamp stage->Sedge Meadow stage-> wood land stage-> Climax forest

Correct answer: (D)
phytoplankton->Rooted aquatic plants->Free floating stage->Reed swamp stage->Sedge Meadow stage-> wood land stage-> Climax forest

380. The order of succession in a lithosere or xerosere is

  1. Foliose lichen stage->Crustose lichen stage->moss stage->herb stage->shrub stage->forest stage (climax community)
  2. Crustose lichen stage->Foilose lichen stage->moss stage->herb stage->shrub stage->forest stage (climax community)
  3. Moss stage ->Foilose lichen stage-> Crustose lichen stage ->herb stage->shrub stage->forest stage (climax community)
  4. Crustose lichen stage->Foilose lichen stage->moss stage-> ->shrub stage-> herb stage->forest stage (climax community)

Correct answer: (B)
Crustose lichen stage->Foilose lichen stage->moss stage->herb stage->shrub stage->forest stage (climax community)

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