WorksheetsUnit 5 Retest
Total questions: 37
Worksheet time: 19mins
Name
Class
Date
1.
What is biodiversity? The ______ of life on Earth or in an ecosystem.
a)
Variety
b)
Function
c)
Amount
d)
Rank
2.
Greater biodiversity leads to greater ______.
a)
Energy output
b)
Competition
c)
Population size
d)
Ecosystem stability
3.
Which of the following is NOT one of the three levels of biodiversity?
a)
Species diversity
b)
Population diversity
c)
Genetic diversity
d)
Ecosystem diversity
4.
Members of the same species can ______ and produce fertile offspring.
a)
Coexist
b)
Interbreed
c)
Fight
d)
Hibernate
5.
Hybrid offspring come from ______ species.
a)
Identical
b)
The same
c)
Different
d)
Cloned
6.
Speciation generally ______ biodiversity.
a)
Decreases
b)
Increases
c)
Eliminates
d)
Stabilizes
7.
Extinction usually ______ biodiversity.
a)
Has no effect on
b)
Increases
c)
Decreases
d)
Stabilizes
8.
Which best describes resistance in an ecosystem?
a)
The ability to avoid interactions with predators
b)
The ability to bounce back after damage occurs
c)
The ability to grow rapidly after a disturbance
d)
The ability to remain unchanged when facing disturbances
9.
What would likely happen to an ecosystem with low biodiversity?
a)
It would maintain stability over time
b)
It would have stronger resistance to change
c)
It would be less stable and more likely to collapse under stress
d)
It would produce more keystone species
10.
Which of the following best defines a keystone species?
a)
A species that exists in large numbers across many ecosystems
b)
A species that plays a critical role in maintaining ecosystem health and balance
c)
A species that is only found in one location globally
d)
A species that depends on biodiversity but doesn’t impact it
11.
How does biodiversity affect food webs?
a)
It adds stability by increasing connections and options for food sources
b)
It increases predator competition and limits producer growth
c)
It allows all organisms to become producers
d)
It reduces the need for decomposers
12.
Which of the following is an ecosystem service that directly benefits humans?
a)
Predator-prey cycles
b)
Rain shadow effect
c)
Tectonic plate movement
d)
Pollination of food crops
13.
What do many scientists believe about current extinction trends?
a)
They indicate we are entering a sixth mass extinction
b)
They are unrelated to human activity
c)
They are slowing down globally
d)
They are affecting only aquatic life
14.
What is habitat fragmentation?
a)
The blending of different ecosystems
b)
The growth of large continuous forests
c)
The splitting of habitats into smaller, isolated patches
d)
The natural expansion of wildlife
15.
Why is habitat fragmentation a threat to biodiversity?
a)
It improves ecosystem stability
b)
It limits movement and access to resources and mates
c)
It promotes invasive species
d)
It triggers speciation to occur more rapidly
16.
What type of species is more affected by habitat loss?
a)
Insect species
b)
Specialist species
c)
Generalist species
d)
Aquatic species
17.
What does it mean if a species is endangered?
a)
It is at high risk of extinction
b)
It is dangerous to humans
c)
It is extinct in the wild
d)
It is invasive in new areas
18.
Which classification means a species is likely to become endangered soon?
a)
Endemic
b)
Threatened
c)
Extirpated
d)
Recovered
19.
Which process creates genetically identical copies of endangered or extinct species?
a)
Splicing
b)
Cloning
c)
Natural selection
d)
Ecotourism
20.
Which of the following best defines an invasive species?
a)
A non-native organism that enters, thrives in, and harms ecosystems
b)
A native species with a large population
c)
A predator that controls herbivore populations
d)
A species with low reproductive rates
21.
Why are invasive species successful in new environments?
a)
They evolve faster than native species
b)
They always come from similar climates
c)
They travel in large numbers
d)
They often lack natural predators in the new habitat
22.
What is one way invasive species harm native species?
a)
They mate with native species, increasing biodiversity
b)
They form mutualism relationships that disrupt natural balance
c)
They outcompete them for food, space, and other resources
d)
They reduce natural competition, increasing the number of resources available
23.
Overharvesting occurs when a species is:
a)
Used by humans faster than it can replenish
b)
Hunted by native predators
c)
Protected by law
d)
Introduced into a new environment
24.
Which of these is an example of overexploitation?
a)
Creating national parks to preserve habitats
b)
Breeding livestock for higher milk production
c)
Illegally fishing Atlantic bluefin tuna
d)
Introducing new corn species into new regions
25.
Why are polar bears considered at risk from climate change?
a)
They are hunted for fur
b)
They migrate too frequently
c)
They are running out of habitat due to melting ice
d)
They are herbivores
26.
The Endangered Species Act protects:
a)
Only extinct species
b)
Plants but not animals
c)
Endangered and threatened species
d)
Invasive and exotic species
27.
What is the purpose of captive breeding programs?
a)
To produce new hybrid species for agriculture
b)
To raise exotic pets for trade
c)
To breed and raise endangered species in zoos and aquariums
d)
To train animals for performance shows
28.
The ultimate goal of captive breeding is to
a)
Reintroduce species to the wild
b)
Keep animals in captivity
c)
Introduce animals to different climates
d)
Make species more adaptable to climate change
29.
How is ecotourism different from traditional tourism?
a)
It encourages luxury travel and resort development
b)
It avoids contact with natural environments
c)
It emphasizes shopping and entertainment over environmental awareness
d)
It focuses on supporting conservation, education, and local communities
30.
Which is the definition of a biodiversity hotspot?
a)
A region with high levels of pollution and low species diversity
b)
A location where many species are endangered but have stable populations
c)
An area with many endemic species and rapid biodiversity loss
d)
A place with no human impact and undisturbed, balanced populations
31.
A zonkey is an example of an invasive species.
a)
True
b)
False
32.
Extinction can be caused by natural and human factors.
a)
True
b)
False
33.
Pollution is the leading cause of biodiversity loss.
a)
True
b)
False
34.
Pesticides are a pollutant that can decrease biodiversity.
a)
True
b)
False
35.
The Galapagos Islands are a popular destination for ecotourism.
a)
True
b)
False
36.
Corals are an example of a keystone species.
a)
True
b)
False
37.
Invasive species increase the biodiversity of an area
a)
True
b)
False
100 %
