$$\text{Sporophyte} \xrightarrow{meiosis} \text{Spores} \xrightarrow{mitosis} \text{Gametophyte} \xrightarrow{mitosis} \text{Gametes}$$

$$\text{Protostome: Blastopore} \rightarrow \text{Mouth}$$; $$\text{Deuterostome: Blastopore} \rightarrow \text{Anus}$$

Question 1

Which of the following is a synapomorphy that distinguishes land plants from their algal ancestors, as shown in the plant phylogeny?

Accepted Answer

Sporic life cycle, embryo, sporopollenin-walled spores, tissue-producing apical meristem, gametangia, sporangia

Question 2

In the alternation of generations in plants, which equation correctly represents the relationship between the sporophyte and gametophyte generations?

Accepted Answer

$$	ext{Sporophyte} \xrightarrow{meiosis} 	ext{Spores} \xrightarrow{mitosis} 	ext{Gametophyte} \xrightarrow{mitosis} 	ext{Gametes}$$

Question 3

Which innovation allowed gymnosperms to colonize dry terrestrial environments more effectively than seedless plants?

Accepted Answer

Production of pollen grains and seeds

Question 4

What is the primary difference between homosporous and heterosporous plants?

Accepted Answer

Homosporous plants produce only one type of spore, while heterosporous plants produce two types: microspores and megaspores.

Question 5

Which of the following is unique to angiosperms and not found in gymnosperms?

Accepted Answer

Double fertilization resulting in triploid endosperm

Question 6

Which of the following best describes the evolutionary significance of the Sarcopterygii clade?

Accepted Answer

They possess lobe-finned appendages, which are precursors to tetrapod limbs.

Question 7

Which equation represents the fate of the blastopore in protostomes versus deuterostomes?

Accepted Answer

$$	ext{Protostome: Blastopore} ightarrow 	ext{Mouth}$$; $$	ext{Deuterostome: Blastopore} ightarrow 	ext{Anus}$$

Question 8

Which of the following is a key innovation that distinguishes chordates from other deuterostomes?

Accepted Answer

Presence of a notochord, dorsal hollow nerve cord, pharyngeal slits, and postanal tail

Question 9

Which of the following best explains why birds are now placed within the reptilian clade?

Accepted Answer

Birds share a common ancestor with reptiles and possess key reptilian features such as amniotic eggs and scales.

Question 10

Which of the following is a distinguishing feature of mammals compared to other amniotes?

Accepted Answer

Presence of mammary glands and hair

Question 11

Which equation best represents the evolutionary transition from aquatic to terrestrial vertebrates?

Accepted Answer

$$	ext{Lobe-finned fish} ightarrow 	ext{Tiktaalik} ightarrow 	ext{Amphibian tetrapod}$$

Question 12

Which of the following is a critical innovation that allowed amniotes to reproduce on land?

Accepted Answer

Development of the amniotic egg with desiccation-resistant membranes

Question 13

Which of the following best describes the difference between acoelomate, pseudocoelomate, and coelomate animals?

Accepted Answer

Acoelomates lack a body cavity, pseudocoelomates have a cavity not fully lined by mesoderm, coelomates have a cavity fully lined by mesoderm.

Question 14

Which of the following is a key innovation of the Ecdysozoa clade?

Accepted Answer

Molting of the exoskeleton (ecdysis)

Question 15

Which of the following is true about the embryological development of protostomes versus deuterostomes?

Accepted Answer

Protostomes exhibit spiral cleavage and determinate development; deuterostomes exhibit radial cleavage and indeterminate development.

Question 16

Which of the following is a distinguishing feature of chordates, as seen in both urochordates and cephalochordates?

Accepted Answer

Presence of a notochord and dorsal hollow nerve cord

Question 17

Which of the following best describes the function of the choanocyte in sponges?

Accepted Answer

Captures food particles from water using a collar of microvilli and flagellum

Question 18

Which of the following is a key innovation that distinguishes Echinodermata from other deuterostomes?

Accepted Answer

Secondary radial symmetry in adults and water vascular system

Question 19

Which of the following best explains the evolutionary advantage of endosporous development in heterosporous plants?

Accepted Answer

It provides protection for gametes and developing embryos inside the spore wall.

A Phylogenetic Perspective on Biological Diversity: Plants and Animals

Study Guide - Practice Questions