STUDY GUIDE COMPLETE EXAM REVIEW
2026/2027 WITH VERIFIED QUESTIONS AND
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Aquatic pests may include:
a. Plants
b. Algae
c. Vertebrates
d. All of the Above
d. All of the Above
Which is not an important factor for aquatic plant growth?
a. A stable substrate
b. Sunlight and nutrients
c. Temperature
d. Large amounts of wave action
d. Large amounts of wave action
The bottom of the photic zone is defined as:
a. 25 feet beneath the surface
b. The depth at whiuch light intensity is equivalent to 5% of full sunlight
c. The depth at which light intensity is equivalent to 1% of full sunlight
d. Only a few inches beneath the surface
c. The depth at which light intensity is equivalent to 1% of full sunlight
It is possible to have dense stands of submersed weeds in clear, clean waters that have low
water nutrient conent, yet have high sediment nutrition.
a. True
b. False
a. True
Large amounts of decomposing plants can _____________ the dissolved oxygen level in a
body of water.
a. raise
b. lower
c. have no effect
d. stabilize
,b. lower
Types of algae that may become pests in Texas water include:
a. filamentous
b. chara
c. planktonic
d. all of the above
d. all of the above
This floating weed is very small, has one or three light green leaves, and can cause oxygen
depletion if allowed to cover the entire surface of a pond.
a. coontail
b. common duckweed
c. button bush
d. willow
b. common duckweed
This non-native floating plant has oblong leaves with a distinct midrib and it is illegal to
possess or transport it.
a. giant salvinia
b. mosquito fern
c. giant duckweed
d. blue flag
a. giant salvinia
All of these floating plants are non-native and are illegal to possess or transport except:
a. common salvinia
b. water hyacinth
c. mosquito fern
d. giant salvinia
c. mosquito fern
This type of aquatic weed has flaccid stems and may be managed using Aquashade.
a. floating
b. submerged
c. emerged
d. all of the above
b. submerged
, This submerged perennial weed is native to Europe and has alternate, oblong leaves that are
toothed with a distinct midrib.
a. giant duckweed
b. cattail
c. coontail
d. curly leaved pondweed
d. curly leaved pondweed
This invasive, submerged plant is considered a noxious pest because it grows so rapidly it out-
competes and eliminates naticve species, hinders recreation and navigation, and blocks water
intakes.
a. hydrilla
b. eelgrass
c. waterstargrass
d. softrush
a. hydrilla
This submersed perennial arises from thickly matted rhizomes, has no floating leaves, and is
excellent food source for waterfowl.
a. southern niad
b. hydrilla
c. sago pondweed
d. torpedograss
c. sago pondweed
______________ is a submersed, grass-like plant that can grow up to 6 feet tall and has a
bright yellow, star shaped flowers
a. widgeon grass
b. coontail
c. water stargrass
d. common reed
c. water stargrass
This aquatic weed is very invasive, has soft whitish hairs in leaf axils, and flowers that
resemble those of white clover.
a. hydrilla
b. spikerush