AQUATIC & MOSQUITO-
COMMERCIAL CATEGORY 5.0. EXAM
2025 QUESTIONS AND ANSWERS
List the roles plants play in a healthy aquatic ecosystem. - ANS -Producing oxygen for other
organisms
-Preventing shoreline erosion
-Lessening excess nutrients
-Stabilizing the lake bottom
-Providing food/habitat
List ways that excessive plant growth can adversely affect the ecology and uses of a water body.
- ANS -Harms the ecology
-Prevents recreational water use
-Makes drinking water smell/taste bad
-Hampers water treatment operations
-Produces toxins that are harmful to drink
Describe the general growth habits of, means of dispersal, and potential problems caused by
emergent aquatic plants. - ANS Growth habits: arrowhead, cattail
Means of dispersal: underground roots
Problems: purple loosestrife
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, Describe the general growth habits of, means of dispersal, and potential problems caused by
submerged aquatic plants (both pond weeds and plants with whorled leaves). - ANS Growth
habits: curly pondweed vs. coontail
Means of dispersal: runners vs. wind/water
Problems: N/A vs. restricts boating and swimming
Describe the general growth habits of, means of dispersal, and potential problems caused by
free-floating and rooted floating-leaved aquatic plants. - ANS Growth habits: duckweed vs.
pond lily
Means of dispersal: wind vs. roots
Problems: hard to get rid of vs. N/A
Describe the general growth habits of, means of dispersal, and potential problems caused by
free-floating, filamentous, and "rooted" algae. - ANS Free-floating: blue-green algae, growth
limited by phosphates, release toxic compounds
Filamentous: anchor themselves to rocks, weeds, etc., long and stringy
Rooted: rooted to bottom with bristly stems and branches, Chara and Nitella
List the advantages and disadvantages of chemical control of aquatic plants and algae. -
ANS (+) Longer lasting control than mechanical
(+) Less physical labor
(+) Costs less
2 Copyright ©2025 THESTAR ALL RIGHTS RESERVED
COMMERCIAL CATEGORY 5.0. EXAM
2025 QUESTIONS AND ANSWERS
List the roles plants play in a healthy aquatic ecosystem. - ANS -Producing oxygen for other
organisms
-Preventing shoreline erosion
-Lessening excess nutrients
-Stabilizing the lake bottom
-Providing food/habitat
List ways that excessive plant growth can adversely affect the ecology and uses of a water body.
- ANS -Harms the ecology
-Prevents recreational water use
-Makes drinking water smell/taste bad
-Hampers water treatment operations
-Produces toxins that are harmful to drink
Describe the general growth habits of, means of dispersal, and potential problems caused by
emergent aquatic plants. - ANS Growth habits: arrowhead, cattail
Means of dispersal: underground roots
Problems: purple loosestrife
1 Copyright ©2025 THESTAR ALL RIGHTS RESERVED
, Describe the general growth habits of, means of dispersal, and potential problems caused by
submerged aquatic plants (both pond weeds and plants with whorled leaves). - ANS Growth
habits: curly pondweed vs. coontail
Means of dispersal: runners vs. wind/water
Problems: N/A vs. restricts boating and swimming
Describe the general growth habits of, means of dispersal, and potential problems caused by
free-floating and rooted floating-leaved aquatic plants. - ANS Growth habits: duckweed vs.
pond lily
Means of dispersal: wind vs. roots
Problems: hard to get rid of vs. N/A
Describe the general growth habits of, means of dispersal, and potential problems caused by
free-floating, filamentous, and "rooted" algae. - ANS Free-floating: blue-green algae, growth
limited by phosphates, release toxic compounds
Filamentous: anchor themselves to rocks, weeds, etc., long and stringy
Rooted: rooted to bottom with bristly stems and branches, Chara and Nitella
List the advantages and disadvantages of chemical control of aquatic plants and algae. -
ANS (+) Longer lasting control than mechanical
(+) Less physical labor
(+) Costs less
2 Copyright ©2025 THESTAR ALL RIGHTS RESERVED
