Natural Selection CFA

In a given population of plants there is variation in the time of day when flowers open. Those individual plants with flowers that open at night would be more likely to pass on this trait in an environment dominated by what?

• Solar radiation

• Nocturnal pollinators

• Moist soil

• Grazing animals

Some plants have developed a thick waxy coating that helps prevent the loss of water. In order for plants to develop this thick waxy coating over many generations, what must be true?

• The plants must have variation in the amount of waxy coating.

• The plants must be able to absorb water directly from the air.

• The plants must live an in area with heavy rainfall.

• The plants must produce wax that animals are able to eat.

A population of a certain kind of fish is introduced into a new habitat. These fish have variations in color from light to dark. Because of the lighting conditions and predators in this new habitat, light-colored fish survive better near the surface and dark-colored fish survive better near the bottom. What change would likely result after many generations of these fish living in this environment?

• All the fish would become more similar, something exactly between light-colored and dark-colored.

• None of the fish would be able to survive, because the new habitat is not suited to any of them.

• There would be two populations of fish, light-colored near the surface and dark-colored near the bottom.

• The fish would become smaller over time so that they could more easily defend themselves from predators.

In an environment where food resources are limited, it would be predicted that there would be an increase in which kind of antlers?

• A

• B

• C

• D

Which catfish trait may change (over many generations) if the pond habitat in which it lives becomes significantly deeper?

• Dorsal Fin

• Caudal Fin

• Swim Bladder

• Gills