Kingdom Protista: Protozoans and Classification

Match each protozoan group to its locomotory structure.

• Cilia (short hairlike structures)

• Sarcodina

• Pseudopodia (false feet)

• Ciliates

• Flagella (whiplike structures)

• Flagellates

A student observes a slipper-shaped unicellular organism with uniform cilia moving in freshwater. Identify the most likely genus.

• Paramecium sp.

• Amoeba proteus

• Trypanosoma gambiense

• Euglena sp.

Explain how protozoan diversity is reflected in Kingdom Protista phyla and give two examples linking a phylum to its example organisms.

Which statement best describes sporozoans such as Plasmodium falciparum?

• They are free-living protozoans with flagella

• They are parasitic protozoans lacking cilia and flagella

• They are photosynthetic algae living in water

• They are multicellular worms with segmented bodies

Match each malaria life stage to its primary site in the human host.

• Daughter cells that invade red blood cells

• Merozoite

• Growing form inside red blood cells

• Sporozoite

• Injected into blood then invades liver cells

• Trophozoite

• Sex cells circulating in human blood

• Gametocyte

Explain how the female Anopheles mosquito and the human each function as hosts in the Plasmodium life cycle.

During an outbreak in a temperate region, patients develop chills followed by fever about two days after infection. Which mechanism most directly explains this timing?

• Rapid antibody production within a few hours

• Sporozoites becoming dormant in liver for months

• Synchronized red blood cell rupture after 48 hours

• Immediate toxin release from mosquito saliva

Which set of materials is essential to prepare hay infusion cultures for observing microorganisms?

• Microscope, glass slides, cover slips, pond water

• Test tubes, Bunsen burner, agar plates, incubator

• Beakers, pH meter, sterile loops, nutrient broth

• Petri dishes, UV lamp, alcohol burner, distilled water

You set up four hay infusion bottles (A hot, B room temperature, C lukewarm, D cold) and sample them daily for a week under a microscope. Plan how you would use your observations to determine the effect of temperature on microbial growth, and state what evidence would support your conclusion.

Which pigment combination primarily classifies green algae in the group Chlorophyta?

• Chlorophyll a and chlorophyll b

• Fucoxanthin and chlorophyll c

• Phycoerythrin and phycocyanin

• Carotene and xanthophylls