Biology Semester Review I

What type of succession is shown going from the empty field in figure A to the weeds grown in the field in figure B?

• primary succession

• ecological succession

• secondary succession

• intermediate

What is the name given to lichen or algae after a primary succession?

• pioneer species
• volunteer species
• founder species
• conqueror species

Decomposers include fungi and many other microorganisms. Which of the following describes the job of decomposers?

• Direct sunlight to be used to create glucose during photosynthesis.

• Protect primary consumers from being eaten by prey.

• Break down nutrients to return them to the soil.

• Provide food for secondary consumers.

What is the BEST definition for Evolution?

• Change
• Adaptation
• Nature's power
• Change over time

What of the following best describes natural selection?

• Survival of the fittest

• The weakest individuals will survive longer and reproduce.

• A mass extinction event

• A random change in a DNA sequence.

The theory that organisms best adapted to their environment are more likely to survive and reproduce.
"Survival of the fittest."

• Natural selection
• Adaptation
• Extinction
• Fossil

A change in a trait or characteristic that increases an organism’s ability to survive and reproduce, such as a change in fur color to blend into the environment, is called:

• extinction

• natural selection

• adaptation

• choice

Which mechanism of evolution involves a chance event that causes a great reduction in the size of a population and less genetic variation?

• Gene Flow

• Genetic Drift

• Mutation

• Natural Selection

Different species have many similar structures between them. This suggests they have:

• No common ancestor

• Evolved separate from one another

• Similar skull apperances

• Evolved from a common ancestor

The species that are most closely related to one another, would be the ones with:

• More differences in the DNA Sequences

• Fewer differences in the DNA Sequences

• Many differences in the DNA Sequences

• No DNA Sequences