$25$ pts$.$

$8.$ True$-$False $($Mark T or F$)$

$$ a$.$ Fifty milligrams per liter of total nitrogen is a reasonable concentration in a sportfish pond.

$q,$ b$.$ An ammonia $(N{H}_3)$ concentration of $0\mathrm{.}1m\frac{g}{L}$ is certainly toxic to fish.

$q,$ c$.$ You should not usually find $H_{2}S$ in well$-$aerated water.

$q,$ d$.$ The dissolved $N_2$ concentration usually exceeds the dissolved $O_2$ concentration.

$q,$ c$.$ Carbon dioxide combines with hemoglobin.

$q,$ f$.$ Nitrate is highly toxic to fish.

$q,$ g$.$ Plants use $HP{O}_4^{2-}$ but not $H_{2}P{O}_4.$

$q,$ h$.P{O}_4^3$ is the dominant form of phosphate at pH $8\mathrm{.}7.$

$q,$ i$.$ Chloride ion competes with $N{O}_2-$ion for uptake by fish.

$q,1.N{O}_2^{-}$tends to be more toxic than $H_{2}S.$

$$ k$.$ Fish require certain amino acids in their diet.

$q,$ L$.N_2$ is the terminal electron acceptor in the Kreb's cycle.

$q,$ m $.$ Energy is destroyed when ADP is converted to ATP.

$q,$ n$.$ Fermentation occurs at a lower redox potential than does aerobic respiration.

$q,$ o$.$ Methane is produced as a byproduct of denitrification.

$q,$ p$.$ An example of a chemoautotrophic process is nitrification.

$q,$ q$.$ An example of an autotrophic process is dissolution.

$q,$ r$.$ More oxygen is needed to oxidize $1$ g of sugar then $0\mathrm{.}75$ g of a typical fat.

$q,$ s$.$ Sulfur dioxide is typically the precursor of acid rain.

$q,$ t$.$ Acid sulfate soils usually have a pH between $5$ and $6$ when exposed to the air