7.L.1.1

Which protists contain both chloroplasts and eyespots?

• amoeba and paramecia

• volvox and paramecia

• euglena and amoeba

• euglena and volvox

Answer explanation

These protist have eyespots to help them detect sunlight so they can use photosynthesis to make food.

The eyespot of a euglena is damaged. How will this affect the organism’s basic functions?

• The euglena will lose its flexibility.

• The euglena will be unable to reproduce.

• The rate of photosynthesis in the euglena will be reduced.

• The ability of the euglena to move away from light will be reduced.

Answer explanation

The eyespot helps euglena detect sunlight. If it is unable to detect and find sunlight, it will have a reduced ability to go through photosynthesis.

Tags

NGSS.MS-LS1-6

What makes the paramecium the most complex of the protists?

• its size

• its color

• its cellular structures

• its speed of movement

Answer explanation

Paramecia have many organelles characteristic of all eukaryotes, such as the energy-generating mitochondria. However, the organism also contains some unique organelles. Under an external covering called the pellicle is a layer of somewhat firm cytoplasm called the ectoplasm.

A teacher prepared slides of microscopic organisms for a science class. The slides were first categorized according to the organisms’ structure and then according to their method of movement. Which organism’s slide would most likely be categorized as “unicellular with cilia for movement”?

• amoeba

• euglena

• paramecium

• volvox

Answer explanation

Paramecium is a single-celled organism that moves with cilia.

List the steps of the scientific method

d

e

f

c

b

a

Communicate results

Draw conclusions

Analyze results

Ask a question

Conduct experiment

Form a hypothesis

Tags

NGSS.MS-PS2-5

Which organisms are both heterotrophic and autotrophic?

• paramecium and amoeba

• euglena and paramecium

• amoeba and euglena

• euglena and volvox

Answer explanation

Both the euglena and volvox have chloroplasts and go through photosynthesis. They are also able to eat other organisms.

Tags

NGSS.MS-LS2-3

Which protist uses cilia to move?

• amoeba

• euglena

• paramecium

• volvox

Answer explanation

Cilia are small hairlike structures that look like eyelashes. The paramecium uses them to move and get food.

Which protists are producers?

• amoebas

• paramecia

• euglenas and volvox

• amoebas and euglenas

Answer explanation

Producers make their own food. Euglenas and volvox produce their own food through photosynthesis.

Which structures are single-celled organisms least likely to use for movement?

• cilia

• flagella

• pseudopodia

• vacuoles

Answer explanation

Vacuoles are organelles that are used to store water and nutrients. All of these other structures are used for movement.

Which term describes all plantlike protists?

• autotrophic

• heterotrophic

• parasitic

• prokaryotic

Answer explanation

Autotrophs are plantlike and heterotrophs are animallike.