Module 4 Chapter 31 Multiple choice questions 31.10

. Refer to the figure.

The graph plots the typical swimming depth from 1 to 1000 meters, versus the tissue density in kilograms per meter cube from 1100 to 1020. Straight-line A extends from 1020, 4 to 1100, 800. Dotted straight line B extends from 1020, 1000 to 1100, 4. Dotted curve C is a bell curve with a peak at 1060, 3. Curve D is an inverted bell curve with a peak at 1060, 1000. All values are estimated.

Sharks do not have swim bladders, but instead, they adjust their buoyancy by adjusting tissue density. In species of shark that generally swim at deeper depths, tissue density tends to be relatively low and have neutral buoyancy. Sharks whose median depth is shallow often have higher tissue density and have negative buoyancy. Sharks swimming at intermediate depths tend to have intermediate tissue densities. In the figure, which line most closely represents the information described here?

. Refer to the table.


 

Concentration of lipids in body

Swimming movement

Density of tissues

Swim bladder

1

High

Frequent or constant

Low

Included

2

Low

Infrequent

 

Low

Not included

3

Low

Frequent or constant

High

Included

4

High

Infrequent

 

High

Not included



For fish, being neutrally buoyant confers energetic advantages. In the table above, which row correctly summarizes the best set of adaptations needed to gain neutral buoyancy?

Back to top