Q: Which of the following equations correctly represents the process of photosynthesis performed by photoautotrophic protists?

$$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2O + \text{light energy} \rightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2$$

Question 1

Which of the following best describes why Kingdom Protista is considered 'polyphyletic'?

Accepted Answer

It contains organisms that do not all share a recent common ancestor.

Question 2

Most protists are unicellular. Which of the following is an example of a multicellular protist?

Accepted Answer

Kelp (a type of brown algae)

Question 3

According to the endosymbiotic theory, which of the following best explains the origin of mitochondria in eukaryotic cells?

Accepted Answer

Mitochondria evolved from free-living prokaryotes that were engulfed by ancestral eukaryotic cells.

Question 4

Which of the following is a way that protists are beneficial to ecosystems?

Accepted Answer

They are the primary producers in many aquatic ecosystems, generating oxygen and forming the base of the food web.

Question 5

Which of the following is an example of a harmful effect caused by protists?

Accepted Answer

Plasmodium species cause malaria in humans.

Question 6

In aquatic ecosystems, which group is primarily responsible for photosynthetic production?

Accepted Answer

Protists such as algae and phytoplankton

Question 7

What could be a major consequence if protist populations (such as phytoplankton) declined significantly in the world's oceans?

Accepted Answer

A decrease in global oxygen production and collapse of aquatic food webs.

Question 8

Which of the following best defines a 'mixotroph'?

Accepted Answer

An organism that can obtain energy both by photosynthesis and by ingesting other organisms.

Question 9

Which of the following equations correctly represents the process of photosynthesis performed by photoautotrophic protists?

Accepted Answer

$$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2O + 	ext{light energy} ightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2$$

Question 10

Which of the following best describes a symbiont?

Accepted Answer

An organism that lives in close association with another organism, often benefiting both.

Question 11

Which of the following is NOT a correct match between the term and its definition?

Accepted Answer

Photoautotroph: An organism that obtains energy by consuming other organisms.

Question 12

A scientist discovers a new protist that can survive in the dark by ingesting bacteria, but also thrives in sunlight by producing its own food. Which nutritional strategy does this protist use?

Accepted Answer

Mixotrophy

Question 13

Which of the following scenarios best illustrates endosymbiosis?

Accepted Answer

A eukaryotic cell engulfing a prokaryote, which then becomes a functional organelle.

Question 14

Which of the following is a correct statement about the evolutionary sequence of life on Earth?

Accepted Answer

Prokaryotes evolved before eukaryotes because they are structurally simpler.

Question 15

Which of the following best describes a parasite?

Accepted Answer

An organism that lives in or on a host and derives nutrients at the host's expense.

Question 16

A sudden decrease in phytoplankton populations in the ocean would most likely result in which of the following?

Accepted Answer

A reduction in atmospheric oxygen and disruption of marine food chains.

Question 17

Which of the following best describes a heterotroph?

Accepted Answer

An organism that obtains energy by consuming other organisms.

Question 18

Which of the following is a real-world example of a symbiotic relationship involving protists?

Accepted Answer

Termites rely on protists in their gut to digest cellulose.

Question 19

Which of the following best explains why protists are considered important primary producers in aquatic ecosystems?

Accepted Answer

They convert solar energy into chemical energy, supporting aquatic food webs.

Question 20

Which of the following is NOT a plausible consequence of a global decline in protist populations?

Accepted Answer

Increased oxygen production in the oceans.

Chapter 28 Study Guide: Protists – Step-by-Step Guidance

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