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HESI A2 · Biology · Biology HESI A2 Practice Exam

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Showing all 5 practice questions with expert explanatory rationales.

Question 1 of 5

How should a researcher test the hypothesis that a particular species of bird vocalizes most in the hours around dawn?

A. Observe a flock of the birds in captivity and record them at two-hour intervals from predawn until sunset for a month.

B. Observe a flock of the birds in the wild and record them at one-hour intervals from predawn until sunset in several seasons.

C. Observe a flock of the birds in the wild and record them in predawn and postdawn hours every day for six months.

D. Observe a flock of the birds in the wild, record them at one-hour intervals for a month, and compare that recording to recordings of other species.

Expert Explanatory Rationale

Correct Answer: Observe a flock of the birds in the wild and record them in predawn and postdawn hours every day for six months.

Question 2 of 5

Which organism reproduces via spore formation?

A. Shelf fungus

B. Lemon tree

C. Smallmouth bass

D. Staphylococcus

Expert Explanatory Rationale

Correct Answer: Shelf fungus

Question 3 of 5

What is another name for the light-independent reaction in plants?

A. Photosynthesis

B. Calvin cycle

C. Germination

D. Phosphorus cycle

Expert Explanatory Rationale

Correct Answer: Calvin cycle

Question 4 of 5

Which part of the plant produces pollen?

A. Anther

B. Style

C. Stigma

D. Pistil

Expert Explanatory Rationale

Correct Answer: Anther

Question 5 of 5

As cattle graze, cattle egrets consume the insects they stir up. This is an example of ___________.

A. Mutualism

B. Parasitism

C. Commensalism

D. Competition

Expert Explanatory Rationale

Correct Answer: Commensalism

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