Transport in Animals Practice Questions

Which substance is made in the liver and carried in the blood to the kidneys to be removed from the body?

Put a cross ( ☒ ) in the box next to your answer.

☐ A glucose

☐ B urea

☐ C oxygen

☐ D mineral ions

Give one reason why dissolved food molecules such as glucose must be transported to all the cells of the body.

During exercise, the volume of blood flowing to the leg muscles each minute increases. Explain one reason for this increase in blood flow.

Calculate the total surface area of the cube.

Calculate the volume of the cube.

Use your answers to parts (a) and (b) to calculate the surface area : volume ratio of the cube. Give your answer in the form $x : 1$.

Calculate the surface area : volume ratio of the cube with sides of length $3\ \mathrm{cm}$. Give your answer in the form $x : 1$.

Using the table, describe how the surface area : volume ratio changes as the cubes get larger.

Explain how these results support the idea that large multicellular organisms need a transport system.

Calculate the surface area : volume ratio of organism Q. Give your answer in the form $x : 1$.

Organism P has a surface area : volume ratio of $3 : 1$. Using the information in the table, explain which organism is better able to supply all of its cytoplasm with oxygen by diffusion across its body surface alone.

An amoeba is a single-celled organism that lives in pond water. It obtains all the oxygen it needs by diffusion across its cell surface membrane. A mouse is a multicellular animal that has lungs and a blood system.

Explain why the mouse needs a transport system but the amoeba does not.

Calculate the surface area : volume ratio of the cube with sides of length $5\ \mathrm{cm}$. Give your answer in the form $x : 1$.

Use the results to explain why a large body size is an advantage for a mammal living in a very cold climate.

Paramecium is a single-celled organism about $0.2\ \mathrm{mm}$ long. It exchanges all the substances it needs directly with the pond water around it.

A trout is a multicellular fish about $30\ \mathrm{cm}$ long. It has gills and a blood circulatory system.

Explain why the trout needs specialised exchange surfaces and a transport system, but Paramecium does not.

In your answer refer to surface area : volume ratio and diffusion distance.

Calculate the surface area : volume ratio of this block. Give your answer in the form $x : 1$.

A second animal has the same volume of $64\ \mathrm{cm^3}$ but a compact, cube-shaped body with sides of length $4\ \mathrm{cm}$. Its surface area : volume ratio is $1.5 : 1$.

Using these figures, explain why the flatworm can survive without a transport system but the compact animal cannot.