Q: Which equation best represents the relationship between multicellularity and tissue development in animals?

$$\text{Multicellularity} \rightarrow \text{Differentiation of cells} \rightarrow \text{Tissue development}$$

Question 1

Which of the following characteristics is unique to animals and distinguishes them from other eukaryotes such as plants and fungi?

Accepted Answer

Muscle tissue specialized for movement

Question 2

Choanoflagellates are considered the closest living relatives to animals. Which feature do choanoflagellates share with sponge choanocytes?

Accepted Answer

A single flagellum surrounded by a collar of cytoplasmic tentacles

Question 3

During the Cambrian explosion, which of the following factors contributed to the rapid diversification of animal species?

Accepted Answer

Evolution of shells and an evolutionary arms race between predators and prey

Question 4

Which of the following best describes the function of Hox genes in animals?

Accepted Answer

Patterning the body axis during development

Question 5

A scientist discovers a new organism with a body plan consisting of only two germ layers: ectoderm and endoderm. Which term best describes this organism?

Accepted Answer

Diploblastic

Question 6

Which of the following is a correct description of bilateral symmetry in animals?

Accepted Answer

The organism can be divided along a vertical plane to produce two mirror-image halves

Question 7

Which of the following is NOT a characteristic cell junction found in animals?

Accepted Answer

Plasmodesmata

Question 8

Which mode of nutrition is characterized by filtering particles from surrounding water?

Accepted Answer

Suspension feeding

Question 9

Which of the following statements about animal reproduction is correct?

Accepted Answer

Nearly all animals reproduce sexually, with small, mobile sperm uniting with a large egg

Question 10

Which of the following is a real-world example of how metamorphosis reduces competition and facilitates dispersal in animals?

Accepted Answer

A caterpillar transforming into a butterfly, allowing it to exploit different food sources and habitats

Question 11

Which equation best represents the relationship between multicellularity and tissue development in animals?

Accepted Answer

$$	ext{Multicellularity} ightarrow 	ext{Differentiation of cells} ightarrow 	ext{Tissue development}$$

Question 12

Which of the following animal groups is correctly matched with its body cavity type?

Accepted Answer

Roundworms (Nematoda) – pseudocoelomate

Question 13

Which of the following evolutionary innovations allowed animals to exploit new environments during the Cambrian period?

Accepted Answer

Evolution of shells

Question 14

Which of the following is a correct sequence of embryonic germ layers from innermost to outermost?

Accepted Answer

Endoderm, mesoderm, ectoderm

Question 15

Which of the following best describes the evolutionary relationship between animals and choanoflagellates?

Accepted Answer

Animals evolved from a choanoflagellate-like ancestor

Question 16

Which of the following is a defining feature of coelomate animals?

Accepted Answer

Fluid-filled body cavity entirely lined by mesoderm

Question 17

Which of the following statements about animal classification is correct?

Accepted Answer

Most biologists agree the animal kingdom is monophyletic

Question 18

Which of the following is a real-world example of suspension feeding?

Accepted Answer

A barnacle filtering plankton from water

Question 19

Which of the following equations correctly represents the relationship between oxygen levels and animal complexity during the Cambrian explosion?

Accepted Answer

$$	ext{Increase in oxygen levels} ightarrow 	ext{More complex body plans}$$

Question 20

Which of the following terms is associated with bilaterally symmetrical animals and refers to the development of a head region?

Accepted Answer

Cephalization

Animal Diversity: Origins, Characteristics, and Body Plans

Study Guide - Practice Questions

Study Guide - Flashcards