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WorksheetsPopulations and Biodiversity
Total questions: 14
Worksheet time: 10mins
Name
Class
Date
1.
The growth rate of a local population is dependent on the birth rate minus the death rate and ____________________________.
a)
the ratio of males to females in the population
b)
the lifespan of females beyond the reproductive age
c)
the amount of genetic variation that exists in the pop.
d)
the immigration and emigration of the population
2.
How does too much fishing in an area affect its ecosystem?
a)
The fish will lay many more eggs to replace fish caught
b)
organisms that eat fish could become endangered due to starvation
c)
organisms that eat the fish will become endangered
d)
people could eat too many fish and become ill
3.
When taken to a new habitat, non-native plants often threaten native plants of the new habitat. Why do they do this?
a)
Non-native plants are able to mutate rapidly
b)
Non-native plants cause native animals to relocate
c)
Non-native plants are able to be used for medicine
d)
Non-native plants compete with native plants for resources
4.
The mountain chorus frog is an endangered species in Maryland. In addition to the loss of habitat, what most likely caused this frog population to decline?
a)
an increase in food source
b)
more frog breeding grounds
c)
native wetlands preservation
d)
poisons dissovled in the water
5.
How can humans best help an endangered species avoid extinction?
a)
They can feed the animals
b)
they can put the animals in a zoo
c)
they can protect the animals habitat
d)
they can take the animal to new habitats
6.
Which of the following is currently a primary cause of species decline worldwide?
a)
habitat destruction
b)
intraspecific competition
c)
random mating
d)
viral outbreaks
7.
A hurricane sweeps across a small Caribbean island, killing 50% of the herbivore species on the island. Which of the following is the most immediate result?
a)
a reduction in biodiversity
b)
an acceleration of the carbon cycle
c)
an increase in predator populations
d)
a decline in decomposer populations
8.
The northern spotted owl is listed under the Endangered Species Act as a threatened species in its primary range. Which of the following most likely contributed to the owl's decline?
a)
increases in rodent populations
b)
loss of trees from forest habitat
c)
prevention of wildfires in forest
d)
decreases in mountain lion populations
9.
If a paleontologist finds fossils of many species in the same area at approximately the same time, he can conclude that the ecosystem in in this area had a high degree of______.
a)
climatic variation
b)
episodic speciation
c)
biological diversity
d)
geographic isolation
10.
Several invasive species eat the fruit of the Loulu tree in Hawaii, this reduces the regeneration rate of the tree. What would be the outcome for Loulu trees in the future without intervention?
a)
They would become extinct.
b)
They would rebound and thrive
c)
They would remain at their current levels
d)
They would evolve a new way to reproduce
11.
The deep-sea ecosystem is a stable ecosystem. Which of these is a characteristic of most stable ecosystems?
a)
They contain a wide variety of organisms
b)
They contain very few organisms
c)
Organic nutrients are in short supply
d)
Sunlight is not used to make food
12.
Which factor that limits a population's size is important only when populations become large and dense?
a)
seasonal cycles
b)
sea level height
c)
extreme weather
d)
predator-prey relatiinships
13.
Brown tree snakes were accidentally carried to Guam. They prey upon birds. There are no natural predators for the snakes in Guam, so which most likely happened as a result of of their arrival on Guam?
a)
Forest biodiversity increased
b)
many bird populations disappeared
c)
Immigration of new species of birds decreased
d)
All reptile species increased in population size
14.
American alligators used to be an endangered species, but not anymore. Which of the following is the best reason why there are more in Louisiana today than there were 50 years ago?
a)
they have learned how to live in new places
b)
they are bigger now than they were 50 years ago
c)
they are now protected from hunting by humans
d)
they have much more habitat now than 50 years ago
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