AQUATIC PEST
MANAGEMENT PRACTICE
EXAM COMPLETE
Question 1: Which feature best distinguishes a free-�oating aquatic weed from a rooted �oating-leaved weed?
Choices:
1) It is not anchored to the bottom by roots 2) It grows entirely beneath the water surface 3) Its stems always emerge above the water 4) It can reproduce only by seed
Correct Answer: It is not anchored to the bottom by roots
Explanation: Free-�oating plants drift on or near the surface and are not rooted in bottom sediments. Rooted �oating-leaved plants are anchored in the substrate even though their leaves �oat at the surface.Page 1
Question 2: A dense mat of �lamentous algae is most accurately classi�ed as which type of aquatic pest?
Choices:
1) Emergent vascular plant 2) Free-�oating vascular plant 3) Alga 4) Submersed rooted plant
Correct Answer: Alga
Explanation: Filamentous algae are nonvascular photosynthetic organisms that form strands or mats. They are classi�ed as algae rather than as emergent, free-�oating vascular, or submersed rooted plants.
Question 3: Which description best �ts a submersed aquatic weed?
Choices:
1) Most leaves and stems remain below the water surface 2) The plant grows only on exposed shorelines 3) All leaves �oat freely without roots 4) The plant has no contact with water
Correct Answer: Most leaves and stems remain below the water surface
Explanation: Submersed weeds grow primarily beneath the water surface, although �owers or small portions may reach the surface. This growth habit a�ects identi�cation and treatment placement.Page 2
Question 4: Cattails growing with roots in saturated soil and shoots extending above the water are classi�ed as what type of aquatic vegetation?
Choices:
1) Algae 2) Emergent vegetation 3) Free-�oating vegetation 4) Submersed vegetation
Correct Answer: Emergent vegetation
Explanation: Emergent plants are rooted in shallow water or saturated soil while much of the stem and foliage extends above the water surface. Cattails are a common example.
Question 5: Which characteristic is most typical of duckweed?
Choices:
1) Large rooted stems arising from deep sediment 2) Tiny �oating fronds that can rapidly cover calm water 3) Long ribbonlike leaves anchored several meters deep 4) Woody stems that remain above water year-round Correct Answer: Tiny �oating fronds that can rapidly cover calm water Explanation: Duckweed consists of very small free-�oating fronds. Under favorable nutrient and temperature conditions it can multiply rapidly and form a surface cover.Page 3