Post Lab Quiz

Question 1

are dissolved oxygen (DO), salinity, alkalinity, hardness, and nutrients

Answer 1

chemical factors

Question 2

are produced by the phytoplankton or by diffusion from the atmosphere.

Answer 2

dissolved oxygen

Question 3

roduced due to the leaching of rocks, erosion, and fertilizers and pesticides, wash out.

Answer 3

elements like N, P,K, Ca, Mg, and others

Question 4

elements can be measured by determining the

Answer 4

total dissolved solids
conductivity
salinity

Question 5

chemical factors of the lake include

Answer 5

dissolved oxygen
salinity
alkalinity
hardness
nutrients

Question 6

the amount of oxygen from the atmosphere and
from aquatic plant

Answer 6

dissolved oxygen

Question 7

Can enter into the system through direct diffusion and as a
by-product of photosynthesis

Answer 7

dissolved oxygen

Question 8

Removed through respiration and decomposition

Answer 8

dissolved oxygen

Question 9

It represents the amount of oxygen consumed by
bacteria and other microorganisms while they
decompose organic matter under aerobic (oxygen is
present) conditions at a specified temperature

Answer 9

biochemical oxygen demand

Question 10

BOD and DO are connected how

Answer 10

inversely proportional

Question 11

Thus, the more the number of organisms in the water body,
the more/less would be the requirement of dissolved oxygen or
DO in the water body.

Answer 11

more

Question 12

DO levels can also be affected by other physical conditions such as

Answer 12

elevation
salinity
temperature
turbulence

Question 13

the amount of oxygen in elevation increases. Since streams get much of their
oxygen from the atmosphere, streams at higher elevations will generally have less oxygen.

Answer 13

elevation

Question 14

Salty water holds less/more oxygen than fresh water.

Answer 14

less

Question 15

• cold water holds more/less dissolved oxygen than warm water

Answer 15

more

Question 16

• more/less turbulence creates more opportunities for oxygen to enter streams

Answer 16

more

Question 17

It is the quantity of hydrogen (H+ ) ions in the water.

Answer 17

pH

Question 18

It is the quantity of hydrogen (H+ ) ions
in the water.

Answer 18

pH

Question 19

0 to 6 is what

Answer 19

acidic

Question 20

7 pH is what

Answer 20

neutral

Question 21

8 to 14 is what

Answer 21

basic

Question 22

pH increases/decreases daily as phytoplankton consume CO2 during photosynthesis, and decreases/increases
at night as they release CO2 during respiration

Answer 22

increases
decreases

Question 23

Low/High pH can reduce the amount of dissolved inorganic phosphorus and CO2 available for
phytoplankton during photosynthesis

Answer 23

Low

Question 24

High/Low pH can make the toxic form of ammonia and phosphate rapidly precipitate

Answer 24

High

Question 25

pH ranges from ____ to ___, but the optimum range is 7.5 -8.5

Answer 25

6.5 to 9

Question 26

optimum pH range

Answer 26

7.5 to 8.5

Question 27

slow growth, the organism ’ s ability to maintain its salt balance is affected and reproduction ceases what pH

Answer 27

below 6.5

Question 28

most species die what pH

Answer 28

below 4.0 and above 11

Question 29

Everything that is not retained by a filter is considered ___ solids.

Answer 29

dissolved

Question 30

Includes materials dissolved in the water (bicarbonates, sulfate, phosphate, nitrate, calcium, magnesium, sodium, and other ions important for sustaining aquatic life

Answer 30

total dissolved solids

Question 31

Affected by urban and fertilizer run-off, wastewater effluent, soil erosion, decaying plants, and geological features in the area

Answer 31

total dissolved solids

Question 32

can be used as an indicator of water quality

Answer 32

amount of dissolved solids

Question 33

A low/high concentration of dissolved solids means potential damage in organisms cells, water turbidity, reduced photosynthetic activity, and increase in temperature

Answer 33

high

Question 34

It is the quantity of dissolved salt content of the water.

Answer 34

salinity

Question 35

Compounds like sodium chloride, magnesium sulfate, potassium nitrate, and sodium bicarbonate dissolve into ions

Answer 35

salinity

Question 36

used as a substitute for salinity.

Answer 36

electrical conductivity

Question 37

Because dissolved salts and other inorganic chemicals conduct electrical current, conductivity decreases/ increases as salinity increases.

Answer 37

increases

Question 38

The level of salinity and conductivity in water can determine the type of organisms that can thrive in freshwater what kind of organisms

Answer 38

halophytes halophiles

Question 39

It is the limiting nutrient during photosynthesis.

Answer 39

nitrogen

Question 40

Enters into aquaculture through rainfall, in-situ N2 fixation, river runoff and diffusion from sediments, uneaten feeds, and fish waste

Answer 40

nitrogen

Question 41

three types of nitrogen

Answer 41

ammonia nitrites nitrates

Question 42

safest nitrogen for fishes

Answer 42

nitrates

Question 43

is the initial product of the decompostion of nitrogenous organic wastes and respiration.

Answer 43

ammonia

Question 44

its toxicity is directly correlated with temperature and pH

Answer 44

ammonia

Question 45

These are completed through nitrification done by aerobic, gram-negative, chemoautotrophic bacteria found naturally in the system.

Answer 45

nitrites

Question 46

High nitrite concentrations are/are not commonly found.

Answer 46

are not

Question 47

If high levels occur, it may lead to ____ due to the deactivation of hemoglobin in fish blood (brown blood disease)

Answer 47

hypoxia

Question 48

is formed through nitrification process (i.e. oxidation of NO2 into NO3 by the action of aerobic bacteria.

Answer 48

nitrates

Question 49

Stable, highly soluble in water, least toxic

Answer 49

nitrates

Question 50

Another limiting factor in plants

Answer 50

phosphorus

Question 50

High levels can lead to osmoregulation, oxygen transport, eutrophication, and algal bloom

Answer 50

nitrates

Question 51

In bodies of water, it typically exists in the form of phosphates.

Answer 51

phosphorus

Question 52

High levels can lead to osmoregulation, oxygen transport, eutrophication, and algal bloom.

Answer 52

phosphorus

Question 53

It is the measure of the quantity of divalent (salts with 2 positive charges) ions such as calcium, magnesium and/or iron in water

Answer 53

hardness

Question 54

is a general term that indicates the total quantity of divalent salts present and does not specifically identify whether calcium, magnesium, and/or some other divalent ions are causing water hardness

Answer 54

calcium carbonate

Question 55

Itis the overall level of biological productivity within a lake and is a key characteristic of water quality.

Answer 55

trophic status

Question 56

trophic status is determined by

Answer 56

Concentration of phytoplankton biomass (chl-a) Concentration of growth-limiting nutrients Transparency of water

Question 57

study the nutrient enrichment table

Answer 57

+1

Question 58

contain low levels of phosphorus and usually support limited biological production (that is, low algal biomass) and thus low concentrations of chl-a

Answer 58

oligotrophic lakes

Question 59

s have moderate levels of phosphorus and support greater biological production and chl-a. These lakes have moderate water clarity

Answer 59

mesotrophic lakes

Question 60

have even greater concentrations of phosphorus and chl-a

Answer 60

eutrophic lakes

Question 61

have concentrations of phosphorus and chl-a beyond even that of eutrophic lakes.

Answer 61

hypereutrophic lakes