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Test your knowledge of aquatic science with this quiz covering key concepts such as microbial contributions, nitrogen fixation, water properties, and pH buffering. Explore the roles of different biological and chemical processes, from protists to fresh water's global percentage. Answer questions about the behaviors of hydrophobic and hydrophilic substances, as well as the characteristics of microbial niches and indicator species. Ideal for students and enthusiasts in environmental science and biology.
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Unit #3 Quiz #2 Grade: «grade» Aquatic Science Subject: «date» Date:
1 Microbes account for about ________% of all the biological mass on Earth. A 98% B 75% C 50% D 22%
2 Which of the following reactions is responsible for fixing nitrogen: A NH4+ --> NO2- B NO2- --> NO3- C NO3- --> N2 D N2 --> NH3
3 At a neutral pH, which molecule is in the highest concentration A carbonate B bicarbonate C carbonic acid D carbon dioxide
4 A reaction between an acid and a base will always form water and ________. A acid B base C salt D carbonate
5 HCO3- is A carbonate B bicarbonate C carbonic acid D carbon dioxide
6 Which of the following is NOT a protist: A Hydra B Amoeba C Euglena D Paramecium
7 H2CO3 is A carbonate B bicarbonate C carbonic acid D carbon dioxide
8 Which of the following is an example of molecular dissociation: A H+ + OH- --> H2O B H2O --> H+ OH- C Fe + CuSO4 --> Cu + FeSO4 D AgNO3 + HCl --> HNO3 + AgCl
9 Which of the following makes up the smallest percent of global freshwater: A glaciers B permafrost C groundwater D surface & atmospheric water
10 The measure of water's ability to buffer against addition of an acid, i.e., ability to resist change of pH upon addition of an acid defines A salinity B alkalinity C hydrophilic D carbonate
11 What percentage of all of the planet's water is fresh water? A 98% B 70% C 30% D 2.5%
12 Which of the following is considered an indicator species: A daphnia B hydra C diatoms D amoebas
13 Which of the following describes a microbe's prime niche A An environment that has a high amount of competition for resources B An environment that has enough nutrients for the microbe to survive C An environment that has enough nutrients for the microbe to thrive D An environment that lacks any usable nutrients and is inhospitable to microbes
14 The following image demonstrates: A high species richness but low abundance B high species abundance but low richness C high species richness and high species abundance D low species richness and low species abundance
15 Which of the following describes the behavior of a hydrophobic substance: A A solution that easily mixes into salt water B A salt sample is added to fresh water & it quickly dissolves C A solution is added to a water sample and the solution floats on top of the water D A large sample of sugar is added to fresh water, but does not dissolve until heat is applied to the mixture
16 Hydrophilic means A "water changing" B "water hating" C "water fearing" D "water loving"
17 CO32- is A carbonate B bicarbonate C carbonic acid D carbon dioxide
18 Which element is always associated with organic compounds: A salt B carbon C oxygen D hydroxide
19 Which element is always associated with organic compounds: A salt B carbon C oxygen D hydroxide
20 Which of the following is primarily responsible for "fixing" carbon dioxide: A autotrophs B chemoautotrophs C heterotrophs D biopolymers
