Iowa Commercial Pesticide Applicator - Aquatic Pest Control (Category 5) exam with verified answers

Iowa Commercial Pesticide !| !| !|




Applicator - Aquatic Pest !| !| !| !|




Control (Category 5) exam !| !| !| !|




with verified answers !| !|




C1: Describe the value of plants in aquatic ecosystems - Correct answer
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✔They are primary producers in the aquatic food chain, produce oxygen,
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provide shelter & sites for spawning, can dampen the force of waves, use
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nutrients & improve water clarity, stabilize the bottom material
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C1:Identify specific problems caused by aquatic weeds - Correct answer
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✔1)Restriction of recreational activities, 2)foul taste & odor, 3)hinder fish
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growth & survival, 4)water flow restrictions, 5)accelerate water loss,
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6)accelerate fill, 7)interfere with navigation, 8)offer a home for noxious
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insects, 9)water becomes toxic, 10)loss of aesthetic appeal, and increase
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maintenance costs. !|




C1:Recognize two instances when aquatic weeds should be eliminated from a
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body of water - Correct answer ✔1) Retention ponds used for fire control or
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irrigation systems; 2) exotic, invasive species
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C2:Describe how sunlight and nutrients affect plant growth - Correct answer
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✔Light: photic zone; water hardness- dissolved calcium & magnesium, low
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hardness, soft, prevents good light penetration, high hardness (60-75 ppm)
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increased light penetration. Nutrients: runoff; eutrophication.
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,C2:List the three nutrients regulating aquatic plant growth - Correct answer
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✔1) carbon (in the form of bicarbonates), 2) nitrogen, and
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3) phosphorus
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C2:Describe how water temperature affects aquatic plant growth - Correct
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answer ✔Most plants grow best in warming water in spring & early summer,
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most die back in fall as water cools, some grow best in late winter & spring
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(curlyleaf); a few later in summer (naiads) !| !| !| !| !| !|




C2:Explain why sand is a good substrate in small bodies of water, but bad in
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rivers - Correct answer ✔Rivers sand shifts, ponds it doesn't matter
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C2:Explain why rock and gravel substrates are not conducive to growth of
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rooted plants - Correct answer ✔They provide little in the way of fertile
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sediments for nutrient uptake !| !| !|




C3:Identify three major types of algae - Correct answer ✔1) microscopic, 2)
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filamentous, 3) stonewarts (Nitella & Chara) !| !| !| !| !|




C3:Differentiate between the four types of flowering plants based on the !| !| !| !| !| !| !| !| !| !| !|




habitat they occupy in the aquatic environment - Correct answer ✔1)
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submersed plants- water depths of less than 1 foot to 20 feet, 2) free-floating
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plants- water surface (duckweed), 3) rooted floating plants- water depths of 1
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to 5 feet (water lotus, pondweed), 4) emergent plants- water depths less than
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3 feet
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, C3:List four types of leaf arrangement that aid in the identification of
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submersed plants - Correct answer ✔1) alternate leaf arrangement- one leaf
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per node (pondweed), 2) opposite leaf arrangement- two leaves per node
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(naiads), 3) whorled leaf arrangement- three or more leaves per node
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(coontail & elodea), & 4) basal leaf arrangement- does not have an erect stem
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(eelgrass)



C3:Discuss why duckweed can be especially problematic in a water body -
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Correct answer ✔Can completely cover the surface and cause the bottom
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layer of water to become anaerobic & unsuitable for fish
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C3:Identify the location of leaf emergence for rooted floating plants - Correct
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answer ✔Underground or in sediment (rhizomes)- American lotus,
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spatterdock, water lily, water shield; From stems- pondweeds
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C3:Distinguish the two types of emergent plants and give an example of each
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- Correct answer ✔1) herbaceous- grass-like plants (cattail, bulrush), plants
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with broad leaves (arrowhead, smartweed); 2) woody plants- (willow,
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buttonbush)



C4:Identify three major objectives in preventive aquatic plant control -
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Correct answer ✔1) prevention of weed spread, 2) elimination of nutrient
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sources that support growth, and 3) reduction of shallow areas where plants
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can root
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C4:List the seven steps to reducing nutrient input through a watershed
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management plan - Correct answer ✔1) install sod or native
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grasses/vegetation along drainage areas & buffers, 2) stop fertilizing grass in !| !| !| !| !| !| !| !| !| !| !|