Question 1

Which of the following best explains why protists are considered a paraphyletic group?

Accepted Answer

They include all eukaryotes except animals, plants, and fungi, but do not share a single common ancestor exclusive to them.

Question 2

Which structure in brown algae is analogous to the roots of land plants, and what is its primary function?

Accepted Answer

Holdfast; anchoring the algae to a substrate

Question 3

A scientist discovers a unicellular eukaryote with two nuclei, multiple flagella, and no functional mitochondria. To which group does this organism most likely belong?

Accepted Answer

Diplomonads

Question 4

Which of the following is evidence supporting the endosymbiotic origin of mitochondria and plastids?

Accepted Answer

They have double membranes and their own circular DNA.

Question 5

Which protist group is responsible for causing red tides, and what is a major ecological consequence of these events?

Accepted Answer

Dinoflagellates; they release toxins that can kill aquatic life

Question 6

A researcher finds a fossil with a porous calcium carbonate shell and long, thin pseudopodia. What is the most likely identity of this organism?

Accepted Answer

Foraminiferan

Question 7

Which of the following best describes the alternation of generations in brown algae?

Accepted Answer

It includes both multicellular haploid gametophyte and multicellular diploid sporophyte stages.

Question 8

Which of the following statements about ciliate reproduction is correct?

Accepted Answer

Ciliates reproduce asexually by binary fission and can exchange genetic material through conjugation.

Question 9

A protist is discovered with a photosynthetic structure called a chromatophore, which evolved independently from chloroplasts. To which group does it most likely belong?

Accepted Answer

Cercozoans

Question 10

Which of the following is a key ecological role of protists in aquatic environments?

Accepted Answer

They are major producers, forming the base of many aquatic food webs.

Question 11

Which process is illustrated by the presence of multiple membranes around plastids in some protists, as shown in the endosymbiosis diagram?

Accepted Answer

Secondary endosymbiosis

Question 12

Which group of protists is characterized by the presence of a crystalline rod inside their flagella?

Accepted Answer

Euglenozoans

Question 13

Which of the following is a mutualistic relationship involving protists?

Accepted Answer

Protists in termite guts digest cellulose, allowing termites to utilize wood as food.

Question 14

Which of the following best describes the function of the micronucleus in ciliates?

Accepted Answer

It is involved in genetic exchange during conjugation.

Question 15

Which protist group includes both free-living and parasitic species, and is characterized by a single large mitochondrion with a kinetoplast?

Accepted Answer

Kinetoplastids

Protists and Plant Diversity: Structure, Function, and Evolution

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