Biology 1108 Unit 3 Exam Questions
with Correct Answers 2025-2026
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 absorb
ed. What is the embryonic origin of these cells? CORRECT ANSWER endoderm
Referring to the figure below, which organism possesses a pseudocoelomate body plan?
CORRECT ANSWER Roundworm
These flagellated, colonial, protists are thought to closely resemble the ancestor of all anim
als: CORRECT ANSWER choanoflagellate
An organism that exhibits a head and central nervous system probably also .
CORRECT ANSWER bilaterally symmetrical
The internal skeleton of sponges is supported by glassy or calcium carbonate spines called:
CORRECT ANSWER spicules
Which of the following best describes the evolutionary process of cephalization? -
CORRECT ANSWER -the formation of a head, as a response to hunting and seeking prey
Which of the following statements would best describe a triploblastic animal?
CORRECT ANSWER One that possess three embryonic tissue layers
These non-bilaterian animals swim using comb-
like plates of cilia, and capture prey using sticky tentacles: CORRECT ANSWER Ctenophora
Which of the following is NOT a characteristic of animals? CORRECT ANSWER
chitin within cell walls
Which of the following animals would be considered asymmetric? CORRECT ANSWER
sponges
with Correct Answers 2025-2026
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 absorb
ed. What is the embryonic origin of these cells? CORRECT ANSWER endoderm
Referring to the figure below, which organism possesses a pseudocoelomate body plan?
CORRECT ANSWER Roundworm
These flagellated, colonial, protists are thought to closely resemble the ancestor of all anim
als: CORRECT ANSWER choanoflagellate
An organism that exhibits a head and central nervous system probably also .
CORRECT ANSWER bilaterally symmetrical
The internal skeleton of sponges is supported by glassy or calcium carbonate spines called:
CORRECT ANSWER spicules
Which of the following best describes the evolutionary process of cephalization? -
CORRECT ANSWER -the formation of a head, as a response to hunting and seeking prey
Which of the following statements would best describe a triploblastic animal?
CORRECT ANSWER One that possess three embryonic tissue layers
These non-bilaterian animals swim using comb-
like plates of cilia, and capture prey using sticky tentacles: CORRECT ANSWER Ctenophora
Which of the following is NOT a characteristic of animals? CORRECT ANSWER
chitin within cell walls
Which of the following animals would be considered asymmetric? CORRECT ANSWER
sponges
