Question 1

Which of the following best describes the difference between acoelomate, pseudocoelomate, and eucoelomate animals?

Accepted Answer

Acoelomates lack a body cavity, pseudocoelomates have a cavity not fully lined by mesoderm, and eucoelomates have a cavity completely lined by mesoderm.

Question 2

During embryological development, which sequence correctly represents the stages from fertilization to gastrulation?

Accepted Answer

Zygote $$\rightarrow$$ morula $$\rightarrow$$ blastula $$\rightarrow$$ gastrula

Question 3

Which of the following is a synapomorphy first exhibited by the phylum Annelida?

Accepted Answer

Segmentation

Question 4

Which statement best explains the function of counter-current exchange in the whale tongue?

Accepted Answer

It minimizes heat loss by allowing warm blood to transfer heat to cold blood returning from the tongue.

Question 5

Which of the following best describes the difference between protostome and deuterostome embryonic development?

Accepted Answer

In protostomes, the blastopore becomes the mouth; in deuterostomes, it becomes the anus.

Question 6

A freshwater ciliate is placed in a hypotonic environment. Which cellular structure is most responsible for maintaining osmotic balance, and how does it function?

Accepted Answer

Contractile vacuole; it expels excess water from the cell to prevent lysis.

Question 7

Which property of water allows aquatic organisms to survive sudden temperature changes in their environment?

Accepted Answer

High specific heat

Question 8

If a cell is placed in a hypertonic solution, what will happen to the cell and why?

Accepted Answer

Water will leave the cell by osmosis, causing it to shrink.

Question 9

Which of the following is a fitness trade-off observed in animal reproductive strategies?

Accepted Answer

Increasing clutch size often results in smaller egg size.

Question 10

Which of the following best describes the function of Malpighian tubules in arthropods?

Accepted Answer

They remove nitrogenous wastes and help conserve water by excreting uric acid.

Question 11

Which of the following is a real-world example of negative feedback in animal physiology?

Accepted Answer

Regulation of body temperature in mammals, where sweating cools the body when overheated.

Question 12

Which of the following best explains why ice floats on water, and how this property benefits aquatic life?

Accepted Answer

Ice is less dense than liquid water, so it floats and insulates the water below, allowing aquatic life to survive in winter.

Question 13

Which of the following is a correct application of diffusion in a biological context?

Accepted Answer

Oxygen moves from areas of high concentration in the lungs to low concentration in the blood.

Question 14

Which of the following best describes the function of metanephridia in annelids?

Accepted Answer

They filter coelomic fluid and excrete wastes through a tubule system.

Question 15

Which of the following is a plausible explanation for the rapid diversification of animal body plans during the Cambrian explosion?

Accepted Answer

The evolution of Hox genes allowed for greater developmental flexibility.

Question 16

Which of the following best describes the relationship between choanoflagellates and animals?

Accepted Answer

Choanoflagellates are the closest living relatives to animals, sharing similar cell structures with sponge choanocytes.

Question 17

Which of the following is a correct example of a correlation between structure and function at the organ-system level?

Accepted Answer

The elongated beak of Galapagos finches allows them to access specific food sources.

Question 18

Which equation best represents the process of osmosis across a semipermeable membrane?

Accepted Answer

$$J = -D \frac{dC}{dx}$$

Question 19

Which of the following is a correct description of the function of protonephridia in Platyhelminthes?

Accepted Answer

They use flame cells to filter and remove excess water and wastes from the body.

Organismal Biology Quiz 4 Review – Step-by-Step Study Guidance

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