Question 1

Which of the following is a synapomorphy that unites all members of the Archaeplastida clade?

Accepted Answer

Presence of phycobilins and primary endosymbiosis with cyanobacteria

Question 2

A scientist observes a eukaryotic organism with a life cycle dominated by haploid cells, where the only diploid stage is the zygote. Which type of meiosis is this organism most likely to exhibit?

Accepted Answer

Zygotic meiosis

Question 3

Which lineage is most closely related to land plants (Embryophyta) based on shared synapomorphies such as sporopollenin and pores?

Accepted Answer

Zygnematophyceae

Question 4

Which pigment is responsible for the red coloration in red algae and absorbs light in the 500–660 nm range?

Accepted Answer

Phycobilins

Question 5

A bloom of dinoflagellates causes a 'red tide' event. Which ecological consequence is most likely to occur?

Accepted Answer

Production of toxins that can accumulate in shellfish and harm humans

Question 6

Which of the following best describes the alternation of generations in land plants?

Accepted Answer

A multicellular haploid gametophyte alternates with a multicellular diploid sporophyte

Question 7

Which group is characterized by the presence of silicon dioxide cell walls and is a major component of marine phytoplankton?

Accepted Answer

Diatoms

Question 8

Which evolutionary innovation allowed plants to colonize dry terrestrial environments by reducing water loss?

Accepted Answer

Development of a cuticle

Question 9

Which of the following is a correct sequence of evolutionary events in the Archaeplastida lineage?

Accepted Answer

Primary endosymbiosis → loss of phycobilins → evolution of stomata

Question 10

Which of the following best explains why brown algae (Phaeophyceae) are not classified within Archaeplastida?

Accepted Answer

Their chloroplasts are derived from secondary endosymbiosis with a red alga

Question 11

A plant lineage evolves heterospory, pollen, and seeds. To which group does it most likely belong?

Accepted Answer

Spermatophyta

Question 12

Which process is responsible for the reduction in chromosome number during sexual reproduction in eukaryotes?

Accepted Answer

Meiosis

Question 13

Which of the following is a key difference between the life cycles of diatoms and dinoflagellates?

Accepted Answer

Diatoms are diploid-dominant, while dinoflagellates are haploid-dominant

Question 14

Which of the following best describes the function of sporopollenin in land plants?

Accepted Answer

It protects spores and pollen from desiccation

Question 15

Which of the following is a synapomorphy of the Opisthokonta clade?

Accepted Answer

Single posterior flagellum in motile cells

Question 16

A researcher finds a eukaryotic organism with two flagella, one of which is hairy. To which major group does this organism most likely belong?

Accepted Answer

Stramenopila

Question 17

Which of the following best explains why an increase in phosphorus in aquatic environments often leads to algal blooms?

Accepted Answer

Phosphorus is a limiting nutrient for algal growth

Question 18

Which of the following is a real-world consequence of the alternation of generations in land plants?

Accepted Answer

It allows for both sexual and asexual reproduction, increasing genetic diversity and colonization ability

Question 19

Which of the following best describes the evolutionary significance of primary endosymbiosis in Archaeplastida?

Accepted Answer

It led to the origin of chloroplasts from cyanobacteria

Question 20

Which of the following is a correct formula for the process of photosynthesis in oxygenic autotrophs?

Accepted Answer

$$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} + 	ext{light energy} ightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2$$

Eukaryotic Diversity and Plant Evolution: Life Cycles, Synapomorphies, and Major Lineages

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