Iowa Commercial Pesticide Applicators: Aquatic Pest Control (Category 5) Exam with Verified Solutions 2024

Iowa Commercial Pesticide Applicators: Aquatic Pest Control (Category 5) Exam with Verified Solutions 2024 C1: Describe the value of plants in aquatic ecosystems - Answer -They are primary producers in the aquatic food chain, produce oxygen, provide shelter & sites for spawning, can dampen the force of waves, use nutrients & improve water clarity, stabilize the bottom material C1:Identify specific problems caused by aquatic weeds - Answer -1)Restriction of recreational activities, 2)foul taste & odor, 3)hinder fish growth & survival, 4)water flow restrictions, 5)accelerate water loss, 6)accelerate fill, 7)interfere with navigation, 8)offer a home for noxious insects, 9)water becomes toxic, 10)loss of aesthetic appeal, and increase maintenance costs. C1:Recognize two instances when aquatic weeds should be eliminated from a body of water - Answer -1) Retention ponds used for fire control or irrigation systems; 2) exotic, invasive species C2:Describe how sunlight and nutrients affect plant growth - Answer -Light: photic zone; water hardnessdissolved calcium & magnesium, low hardness, soft, prevents good light penetration, high hardness (60- 75 ppm) increased light penetration. Nutrients: runoff; eutrophication. C2:List the three nutrients regulating aquatic plant growth - Answer -1) carbon (in the form of bicarbonates), 2) nitrogen, and 3) phosphorus C2:Describe how water temperature affects aquatic plant growth - Answer -Most plants grow best in warming water in spring & early summer, most die back in fall as water cools, some grow best in late winter & spring (curlyleaf); a few later in summer (naiads) C2:Explain why sand is a good substrate in small bodies of water, but bad in rivers - Answer -Rivers sand shifts, ponds it doesn't matter C2:Explain why rock and gravel substrates are not conducive to growth of rooted plants - Answer -They provide little in the way of fertile sediments for nutrient uptake C3:Identify three major types of algae - Answer -1) microscopic, 2) filamentous, 3) stonewarts (Nitella & Chara) C3:Differentiate between the four types of flowering plants based on the habitat they occupy in the aquatic environment - Answer -1) submersed plants- water depths of less than 1 foot to 20 feet, 2) freefloating plants- water surface (duckweed), 3) rooted floating plants- water depths of 1 to 5 feet (water lotus, pondweed), 4) emergent plants- water depths less than 3 feet C3:List four types of leaf arrangement that aid in the identification of submersed plants - Answer -1) alternate leaf arrangement- one leaf per node (pondweed), 2) opposite leaf arrangement- two leaves per node (naiads), 3) whorled leaf arrangement- three or more leaves per node (coontail & elodea), & 4) basal leaf arrangement- does not have an erect stem (eelgrass) C3:Discuss why duckweed can be especially problematic in a water body - Answer -Can complete