Question 1

Which of the following best explains why the rearward-facing flagellum is considered a key evolutionary trait in the clade Opisthokonta?

Accepted Answer

It is a synapomorphy that links fungi and animals, indicating a shared ancestry.

Question 2

A biologist observes a fungus with sexual reproductive structures called asci. Which phylum does this fungus most likely belong to?

Accepted Answer

Ascomycota

Question 3

Which of the following best describes the mutualistic relationship in mycorrhizae?

Accepted Answer

Fungi provide minerals and water to plants, and plants provide carbohydrates to fungi.

Question 4

Which structure in sponges is responsible for generating water flow and capturing food particles?

Accepted Answer

Choanocytes

Question 5

A marine biologist finds an animal with radial symmetry, nematocysts, and a polyp body form. To which group does this animal most likely belong?

Accepted Answer

Cnidaria: Anthozoa

Question 6

Which of the following statements about earthworm anatomy is correct?

Accepted Answer

The gizzard grinds food, while the crop stores it.

Question 7

Which feature distinguishes Ctenophora from Cnidaria?

Accepted Answer

Absence of nematocysts

Question 8

A tapeworm specimen is observed with a scolex and numerous gravid proglottids. What is the primary function of the gravid proglottids?

Accepted Answer

Production and release of eggs

Question 9

Which of the following best describes the three-part body plan of mollusks?

Accepted Answer

Mantle, visceral mass, muscular foot

Question 10

In cephalopods, which structure is derived from the molluscan foot and is used for locomotion and prey capture?

Accepted Answer

Arms and tentacles

Question 11

Which process unites all Ecdysozoa and is essential for their growth?

Accepted Answer

Ecdysis (molting of the cuticle)

Question 12

A student observes an arthropod with chelicerae, book gills, and a telson. To which group does this animal most likely belong?

Accepted Answer

Chelicerata: Merostomata (horseshoe crabs)

Question 13

Which of the following is a key difference between Nematoda and Annelida?

Accepted Answer

Nematoda are pseudocoelomate; Annelida are coelomate and segmented.

Question 14

In echinoderms, water enters the water vascular system through which structure?

Accepted Answer

Madreporite

Question 15

Which of the following is NOT one of the four classic chordate synapomorphies?

Accepted Answer

Vertebral column

Question 16

Which vertebrate class is characterized by a cartilaginous skeleton and includes sharks and rays?

Accepted Answer

Chondrichthyes

Question 17

Which adaptation is most directly responsible for the success of vertebrates in terrestrial environments?

Accepted Answer

Evolution of the amniotic egg

Question 18

Which of the following best defines a keystone species?

Accepted Answer

A species whose impact on its community is disproportionately large relative to its abundance.

Question 19

Which of the following is an example of commensalism?

Accepted Answer

Oysters attaching to mangrove roots, gaining a place to live without harming or benefiting the mangrove

Question 20

Which dental adaptation is characteristic of carnivorous mammals and is used for shearing flesh?

Accepted Answer

Carnassial teeth

Bio II Lab Study Guide: Fungi, Animal Evolution, and Mammalian Ecology

Study Guide - Practice Questions