Environmental Engineering

411. Which of the following is a secondary pollutant

1. CO2
2. CO
3. O3
4. SO2

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412. Which of the following is false?

1. Quantity of biomass in a trophic level at a particular period is called as standing crop
2. The energy content in a trophic level is determined is determined by considering a few individuals of a species in that trophic level.
3. The succession that occurs in newly cooled lava is called primary succession
4. Rate of succession is faster in secondary succession
5. phytoplanktons are the pioneers in the aquatic ecosystem

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413. Which of the following is mainly responsible for the extinction of wild life

1. Pollution of air and water
2. Hunting of flesh
3. Destruction of Habitats
4. All of these

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414. Which of the following is the best indicator of SO2 pollution

1. bryophyte
2. pteridophyte
3. Lichen
4. algae

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415. Which of the following is the major cause of pollution

1. plants
2. man
3. fungi
4. hydrocarbon gases

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416. Which of the following regarding ecological pyramids is not correct?

1. In most ecosystems, the pyramid of numbers and biomass are up right
2. In tree dominated ecosystem the pyramid of numbers is inverted
3. The pyramid of energy expresses mainly the rate of food production
4. In deep water ecosystem, the pyramid of biomass is upright
5. The total energy flow at successive tropical level always decreases

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417. Which of the following region has maximum diversity

1. mangrooves
2. temperate rainforest
3. taiga
4. coral reefs

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418. Which of the following statement is incorrect regarding ecological pyramids

1. The pyramid of energy is inverted in ocean ecosystem
2. The pyramid of biomass is inverted in aquatic ecosystem
3. The pyramid of numbers is upright in grass land ecosystem
4. The pyramid of biomass is upright in grass land ecosystem

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419. Which of the following statements regarding species interdependence are true?
A) An association of two species where one is benefitted and other remains unaffected called mutualism
B) An interspecific association where both partners derive benefit from each other is called commensalism
C) A direct food relation between two species of animals in which one animals kills and feed on another is referred as predation
D) A relationship between two species of organism where both the partners are benefitted from each other is called symbiosis.

1. A and B only
2. C and D only
3. A and C only
4. B and C only
5. B and D only

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420. Which of the radioactive material is largely associated with bone cancer

1. radium-226
2. thorium-232
3. Strontium-90
4. iodine

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