
APES Ecosystem Unit Review
Flashcard
•
Science
•
12th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is directional selection?
Back
Directional selection is a mode of natural selection in which a single phenotype is favored, causing the allele frequency to shift in one direction.
2.
FLASHCARD QUESTION
Front
Why do terrestrial trophic pyramids usually not have levels higher than tertiary consumers?
Back
A large proportion of energy is lost as heat as it is transferred up the pyramid, so there is not enough energy available to support another level.
3.
FLASHCARD QUESTION
Front
According to the theory of island biogeography, why would an island 5 kilometers from a continent have more species than one 15 kilometers away?
Back
There are more species that have the ability to travel 5 kilometers than can travel 15 kilometers.
4.
FLASHCARD QUESTION
Front
What historical pesticide caused problems for birds by making their eggs too thin?
Back
DDT (Dichloro-Diphenyl-Trichloroethane) caused problems for birds because it made their eggs too thin.
5.
FLASHCARD QUESTION
Front
What is biomagnification?
Back
Biomagnification is the process by which the concentration of toxic substances increases in organisms at each successive level of the food chain.
6.
FLASHCARD QUESTION
Front
Define trophic levels in an ecosystem.
Back
Trophic levels are the hierarchical levels in an ecosystem, comprising producers, primary consumers, secondary consumers, and tertiary consumers.
7.
FLASHCARD QUESTION
Front
What is the role of producers in an ecosystem?
Back
Producers, such as plants and phytoplankton, convert solar energy into chemical energy through photosynthesis, forming the base of the food chain.
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