3 5 6 EnvSci226 Final Exam Name Page 3 of 7 10. The Gulf of Maine rocky intertid
ID: 294949 • Letter: 3
Question
3 5 6 EnvSci226 Final Exam Name Page 3 of 7 10. The Gulf of Maine rocky intertidal zone a. Exhib intertidal zone than barnacles bits strong zonation patterns with mussels usually located higher in the c. d. e. Like the Pacific northwest intertidal, starfish are the keystone predators Dog whelks are herbivorous snails feeding on brown algac None of the above 11. What sensory organ in fish consists of a network of pores that detect electric fields? a. Lateral Line b. Neuromast c. Ampullac of Lorenzini d. Otolith e. Barbel 12. Which trait is not shared between subclasses Elasmobranchi and Holocephali? a. Cartilaginous skeleton b. Lack of gas bladders c. Males have claspers d. Cloaca e. Spiral valve intestine Which is not a way cartilaginous fish maintain an internal tissue concentration of solutes that is about the same as seawater, thus reducing the osmotic pressure and the tendency to either lose or gain water across their tissues? a. Maintaining an elevated concentration of urea in their blood to rid the body of 13. nitrogen waste. b. Excreting excess salts by use of their kidneys c. Using a specialized salt-secreting gland called their rectal gland to rid the body of excess salts d. Gills contain specialized cells allowing for the excretion of urca across the gills e. Salts are excreted in urine and feces MA outfall began discharging in about 35 m of water in September 2000. waters of Massachusetts Bay each summer critically low levels 14. Since the a. A dead zone of very low dissolved oxygen (Explanation / Answer
ANSWER-
10. A) exhibits strong zonation patterns with muscles usually located higher in the intertidal zones than barnacles.
11. C) Ampullae or Lorenzini.
12. B) lack of gas bladders.
elasmobranchii lacks bladders unlike holocephali.
13. A) maintaining an elevated concentration of urea in their blood to rid the body of nitrogen waste.
14. B) species diversity of the soft-bottom benthic communities has plummeted to critically low levels.
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