PRE-CLASS QUESTIONS for Week #9
(individual; open book; turn in July 15, 2008)
(lose 20% if turned in on July 16; lose everything if turned in later!)

Grades will be curved providing you correctly answer at least 2 of these:
Put your answers on the answer sheet.

 1. You have two one-million-gallon samples of water. One has a BOD of 30 ppm and the other a BOD of 5 ppm.

(a) It would be proper to discharge the BOD-30 sample into a river.
(b) It would be proper to discharge the BOD-5 water into a river.
(c) Both may be legally discharged into a river.
(d) Neither may be discharged into a river.
(e) The BOD-30 has more dissolved oxygen than does the BOD-5
(f) none of the above

  4. Pseudopodia are possessed by

(a) amoeba
(b) daphnia
(c) euglena
(d) paramecia
(e) pill bugs
(f) snails

 2. Dr. Sevick collected a liter of water from the college pond. This water were thoroughly shaken to aerate it. 300 mL was then put into a bottle (#1) that was filled to the brim and capped. 700 mL of distilled water was added to the remaining and thoroughly shaken to saturate the contents with oxygen to 11 ppm (parts per million). 300 mL of that filled another bottle (#2) to the brim and capped. Once again the remainder was diluted in half with distilled water, shaken and used to fill a third bottle (#3), which was capped. All three bottles were stored away for 3 days before they were taken out and an electronic oxygen probe was inserted and the oxygen concentrations were taken.

#10 ppm     #25 ppm     #38 ppm

(a) The BOD = 2 ppm
(b) The BOD = 4 ppm
(c) The BOD = 8 ppm
(d) The BOD = 12 ppm
(e) The BOD = 16 ppm
(f) insufficient data

 5. Which is true: plant chloroplasts

(a) do not have circular DNA
(b) do not have ribosomes
(c) do not convert H2O to elemental oxygen
(d) do not convert H2S to elemental sulfur
(e) do share mitochondria with the plant cell's cytoplasm

 3. Which of the following is NOT true about euglena, paramecia AND amoeba:
(a) they are prokaryotes
(b) they all possess ribosomes
(c) they all possess mitochondria
(d) only one occasionally possesses chloroplasts
(e) they are all aquatic
 6. Regarding a secondary sewage treatment plant, the "secondary" phase is primarily for
(a) the removal of photosynthetic organisms
(b) eliminating BOD
(c) adding either chlorine or ozone
(d) ridding the water of suspended solids such as silt, plastic drinking straws, leaves, twigs...
(e) removal of viruses
(f) adding good bacteria which will benefit the fish in the receiving river
(g) adding BOD