Question

c. quick check (true or false):

1. euglena is both autotrophic and heterotrophic. ___
2. the fine adjustment knob should be used with the high - power lens. ___
3. the cell wall is found in both plant and animal cells. ___

Explanation:

1. Euglena is both autotrophic and heterotrophic.

Euglena has chloroplasts for photosynthesis (autotrophic) and can also ingest food (heterotrophic), so this statement is true.

The fine adjustment knob is used for precise focusing, and it is appropriate to use it with the high - power lens (after getting a rough focus with low - power and then switching to high - power and using fine adjustment). So this statement is true.

Plant cells have a cell wall, but animal cells do not have a cell wall. So this statement is false.

Answer:

True

2. The fine adjustment knob should be used with the high - power lens.