Download SGBAU BSc 2019 Summer 3rd Sem Environemtal Science Environmental Chemistry Question Paper

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B.Sc. Part-II (Semester-III) Examination

ENVIRONMENTAL SCIENCE

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(Environmental Chemistry)

Paper—III

Time : Three Hours] [Maximum Marks : 80

Note :— ALL questions are compulsory and Question No. 2-7 carry equal marks. Draw well labelled diagram wherever necessary.

1. (A) Fill in the blanks :
   1. __________ is the main component of biogas. ½

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   2. DDT stands for __________. ½
   3. Oxygen and __________ are the energy exchange elements. ½
   4. Skin is made up of __________ protein. ½
2. (B) Choose the correct alternatives :
   1. A solar cell is made up of __________. ½
      1. Silicon

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      2. Titanium
      3. Magnesium
      4. Teflon
   2. Which of the following is not a food toxicant ? ½
      1. Preservatives

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      2. Flavouring agents
      3. Colours
      4. CO
   3. __________ and __________ are activators and inhibitors elements. ½
      1. Na and Ca

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      2. U and Li
      3. Mg and Co
      4. Fe and Ni
   4. Which of the following is the Pentose Sugar ? ½
      1. Erythrose

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      2. Glucose
      3. Ribose
      4. Galactose

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3. (C) Answer the following in ONE sentence :
   1. Define OTEC. 1
   2. What are trace elements ? 1
   3. What are enzymes ? 1
   4. Define Biomagnification. 1

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2. (a) Explain the factors that affect solubility of gases in water. 4 (b) Describe the role of nitrogen and phosphorus in plants. 4 (c) Mention any four basic differences in saturated and unsaturated hydrocarbon. 4

   OR

   (d) Give the properties of bases. 4 (e) Give the role of Mg and Ca in plant life 4 (f) Oxygen as a bioelement. 4
3. (g) Give the classification of carbohydrates. 4 (h) With the help of diagram explain mechanism of enzyme action. 4 (i) Explain any four properties of enzyme. 4

   OR

   (j) Describe properties of fatty acids. 4 (k) Discuss types of proteins. 4 (l) Explain any four properties of Amino Acids. 4
4. (m) Explain acute and subacute toxicity. 4 (n) Describe Lethal dose and Lethal concentration. 4 (o) How will you differentiate bio-magnification and bio-transformation ? 4

   OR

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   (p) Discuss life cycle test as a chronic toxicity test. 4 (q) Explain the factors that affect toxicity to human beings. 4 (r) Explain Bio-Magnification 4
5. Describe route of exposure, mode of action and physiological effects of aldrin and BHC. 12

   OR

   What is detoxification ? Describe the detail mechanism of detoxification. 12
6. Explain structure of water in detail. Discuss in detail physico-chemical properties of water. 12

   OR

   What is chemical speciation ? Discuss about speciation of Pb and Hg. 12

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7. Explain in brief :
   1. Solar chimney. 4
   2. Significance of hydro and wind power as energy resources. 4
   3. Principles and significance of OTEC. 4

   OR

   1. Mechanism of hydropower generation. 4

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   2. Mechanism of bioalcohol production. 4
   3. Define renewable energy sources and explain its advantages. 4

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