Biology Semester 1 Exam

Which of the following descriptions about the organization of an ecosystem is correct?

• Communities make up species, which makes up populations.

• Populations make up species, which make up communities.

• Species make up communities, which make up populations.

• Species make up populations, which make up communities.

The lowest level of environmental complexity that includes living and nonliving factors is the

• biome.

• community.

• ecosystem.

• biosphere.

Which is an example of mutualism?

• a fish protecting a shrimp, who builds a burrow for the pair to share

• crayfish and minnows resting under the same rock

• a peacock courting and mating with a peahen

• two snake species with similar markings advertising their toxic venom

Each of the following is an abiotic factor in the environment EXCEPT

• plant life.

• soil life.

• rainfall.

• temperature.

The region of land a jaguar must roam to collect food would be an example of a(n)

• habitat.

• niche.

• ecology.

• commensalism.

The algae, insect larvae, protozoans, and other living things in a large puddle would be an example of a(n)

• community.

• ecosystem.

• species.

• biome.

How does an area's weather differ from the area's climate?

• Weather involved temperature she precipitation and climate involves only temperature.

• An area's weather depends on where it is located on Earth and the area's climate does not.

• An area's weather does not change very much and an area's climate changes many times.

• Weather is the area's day-to-day conditions and climate is the area's average conditions.

What is one difference between primary and secondary succession?

• Primary succession is rapid and secondary succession is slow.

• Secondary succession begins on soil and primary succession begins on newly exposed surfaces.

• Primary succession modifies the environment and secondary succession does not.

• Secondary succession begins with lichens and primary succession begins with trees.

What is a climax community?

• community consisting of pioneer organisms

• community with no biotic factors

• community left behind immediately after a forest fire

• stable community with little change in species numbers

Which of the following tells you population density?

• The number of births per year

• The number of frogs in a pond

• The number of deaths per year

• The number of bacteria per square millimeter