Biology 1108 Unit 3 Exam Questions with Correct Answers

Biology 1108 Unit 3 Exam Questions
with Correct Answers 2026-2027
Which of the following describes the relationship of mycorrhizal fungi and plants? -
CORRECT ANSWER -they live in and among plant roots, supplying plants with nutrients.



Fungi that absorb nutrients from decaying plant matter are called .-
CORRECT ANSWER -saprobes



Which of the following best describes how fungi are able to obtain nutrition? -
CORRECT ANSWER -absorbing nutrient via external digestion



The main body of a fungus, which is composed of a mass of tubular hyphae: -
CORRECT ANSWER -mycelium



Lichens are symbiotic associations of fungi and . - CORRECT ANSWER -
cyanobacteria or green algae



Which of these fungal features supports the phylogenetic conclusion that fungi are more cl
osely related to animals than to plants? - CORRECT ANSWER -
The cell walls of fungi are made of chitin.



A mold with coeonocytic hyphae is discovered. Which statement would best describe these
hyphae? - CORRECT ANSWER -they have no walls, and multiple nuclei.



These cnidarians secrete a calcium carbonate exoskeleton and form symbiotic relationships
with protists that photosynthesize in the clear waters of the tropics: - CORRECT ANSWER -
corals

, The digestive system of most animals is lined with cells through which nutrients are abso
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rb ed. What is the embryonic origin of these cells? - CORRECT ANSWER -endoderm
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Referring to the figure below, which organism possesses a pseudocoelomate body plan? -
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CORRECT ANSWER -Roundworm
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These flagellated, colonial, protists are thought to closely resemble the ancestor of all ani
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m als: - CORRECT ANSWER -choanoflagellate
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An organism that exhibits a head and central nervous system probably also
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CORRECT ANSWER -bilaterally symmetrical
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The internal skeleton of sponges is supported by glassy or calcium carbonate spines called:
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- CORRECT ANSWER -spicules
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Which of the following best describes the evolutionary process of cephalization? -
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CORRECT ANSWER -the formation of a head, as a response to hunting and seeking prey
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Which of the following statements would best describe a triploblastic animal?
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- CORRECT ANSWER -One that possess three embryonic tissue layers
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These non-bilaterian animals swim using comb-
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like plates of cilia, and capture prey using sticky tentacles: - CORRECT ANSWER -Ctenophora
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Which of the following is NOT a characteristic of animals? - CORRECT ANSWER -
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chitin within cell walls
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Which of the following animals would be considered asymmetric? - CORRECT ANSWER -
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sponges
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