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

$$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2O + \text{light energy} \rightarrow C_6H_{12}O_6$ + 6\ \mathrm{O}_2$$

Question 1

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

Accepted Answer

It groups together organisms that do not share a recent common ancestor.

Question 2

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 events is believed to have occurred first in the evolution of eukaryotic cells?

Accepted Answer

A prokaryotic cell engulfed another prokaryote that became the mitochondrion.

Question 4

Which of the following best defines a mixotroph?

Accepted Answer

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

Question 5

Which of the following is a significant ecological role of protists in aquatic ecosystems?

Accepted Answer

They serve as the main producers, converting solar energy into chemical energy.

Question 6

What is a likely consequence if protist populations dramatically declined in the world's oceans?

Accepted Answer

Aquatic food webs would collapse due to loss of primary producers.

Question 7

Which of the following is an example of a protist that is harmful to humans, and what disease does it cause?

Accepted Answer

Plasmodium; causes malaria

Question 8

Which of the following best describes the relationship between a symbiont and its host?

Accepted Answer

The symbiont lives in close association with the host, which may be beneficial, neutral, or harmful.

Question 9

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

Accepted Answer

$$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2O + 	ext{light energy} ightarrow C_6H_{12}O_6$ + 6\ \mathrm{O}_2$$

Question 10

A scientist discovers a new protist that can survive by both ingesting bacteria and performing photosynthesis. Which term best describes this organism?

Accepted Answer

Mixotroph

Question 11

Which of the following statements about endosymbiosis is correct?

Accepted Answer

It explains the origin of mitochondria and chloroplasts in eukaryotic cells.

Question 12

Which of the following is NOT a way that protists are beneficial to ecosystems or humans?

Accepted Answer

Causing malaria in humans

Question 13

Which of the following best defines a parasite?

Accepted Answer

An organism that lives in or on another organism and benefits at the host's expense.

Question 14

In terrestrial ecosystems, plants are the main producers. In aquatic ecosystems, which group primarily fulfills this role?

Accepted Answer

Protists such as algae

Question 15

Which of the following is a correct statement about consumers in an ecosystem?

Accepted Answer

Consumers obtain energy by eating other organisms.

Question 16

A student claims that all protists are harmful parasites. Which of the following best refutes this claim?

Accepted Answer

Many protists are primary producers that support aquatic food webs.

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 scenarios best illustrates the concept of symbiosis?

Accepted Answer

A protist living inside a termite's gut, helping digest cellulose.

Question 19

Which of the following is a plausible negative consequence of a global decline in protist populations in aquatic biomes?

Accepted Answer

Reduced oxygen production and collapse of aquatic food webs

Question 20

Which of the following best describes the difference between a producer and a consumer?

Accepted Answer

A producer converts sunlight into chemical energy, while a consumer obtains energy by consuming other organisms.

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

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