BSCS Biology: A Molecular Approach

Chapter 24: Ecosystem Structure and Function

The Structure of Ecosystems

1.
Sunlight, availability of water, and soil composition are all ___ factors that affect the distribution of organisms.
A)abiotic
B)antibiotic
C)minor
D)biotic
2.
The main producers in land ecosystems are ___.
A)carnivores
B)herbivores
C)predators
D)plants
3.
___ is the idea that two species cannot occupy the same niche in the same ecosystem for long.
A)mutually assured destruction
B)the competitive exclusion principle
C)mutualism
D)parasitism
4.
What is the function of these microscopic bladders on the leaf of the saltbush plant?
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A)they collect and concentrate salt
B)they collect urine
C)they cool the plant
D)they protect the plant surface
5.
What is commensalism?
A)A relationship in which one species consumes another as prey.
B)A symbiotic relationship in which one organism gains at the expense of another.
C)A symbiotic relationship in which one organism benefits and the other is unaffected.
D)A symbiotic relationship in which both species benefit.
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