Biology CLEP exam: Population Biology questions
with correct answers
Energy Flow in Ecosystem Correct Answer-Primary Producers>Primary
Consumers>Secondary Consumers>Tertiary Consumers
- Primary producers (plants, algae, and some bacteria) use solar energy to produce
organic plant material through photosynthesis.
- Second trophic level: Herbivores—animals that feed solely on plants—make up
the.
- Third Tropic level: Predators that eat herbivores; if larger predators are present,
they represent still higher trophic levels.
- Highest of the trophic levels at which they feed: Organisms that feed at several
trophic levels (for example, grizzly bears that eat berries and salmon) are classified
at the .
Decomposers, which include bacteria, fungi, molds, worms, and insects, break
down wastes and dead organisms and return nutrients to the soil
Productivity in Ecosystem Correct Answer-- the amount of energy flowing through
any ecosystem is determined by its net primary productivity, which may change
over time
Biogeochemical cycles Correct Answer-The movement of abiotic factors between
the living and nonliving components within ecosystems; also known as nutrient
cycles (i.e., water cycle, carbon cycle, oxygen cycle, and nitrogen cycle).
