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WorksheetsHabitat Destruction and Endangered Species
Total questions: 36
Worksheet time: 19mins
In 2002, fewer than 200 Siberian tigers remained in the wild due to overhunting and habitat destruction. If this trend continues, what will most likely happen to the Siberian tiger species?
they may decrease to the point of extinction
they may develop into a new species
they will increase in number
they will find a new place to live
Which of the following human activities have helped to save the biodiversity of an ecosystem?
draining water from wetlands
removing predators from an ecosystem
setting up wildlife refuges and protected parks
introducing new species to ecosystems
When a species is so rare that it may become extinct it is considered _______________.
diverse
endangered
well camouflaged
recovered
Explain the relationship between extinction and biodiversity.
Extinction contributes to an increase in biodiversity
Extinction contributes to a decrease in biodiversity
Extinction randomly changes biodiversity in one direction or the other
Extinction has no impact on biodiversity
If none of the individuals within a particular species can survive to reproduce, what will happen to that species?
They will increase in number
They will adapt to a new environment
They will become extinct
They will evolve into a new species.
If you are talking about the variety of species that make up a community, you are talking about ________.
biodiversity
biomass
biotic factors
biomes
Key deer are the smallest species of deer found in North America. Clearing the land to build houses has slowly destroyed their habitat. Laws do not allow the deer to be hunted as the species is in danger of dying out. The Key deer can be classified as ________.
a thriving species
an extinct species
a balanced species
an endangered species
What happens when an ecosystem becomes less biodiverse?
The health of the ecosystem increases.
The health of the ecosystem decreases.
The health of the ecosystem remains the same.
The ecosystem cannot survive.
2. If the last three animals of a species are all females, what will happen to the species?
Since females have babies, no males are needed to reproduce.
The species will become extinct because it takes a male and a female to reproduce.
The species will slowly grow in numbers.
The species will not be affected by all three members being female.
If all of the predators in an ecosystem are killed off, what happens to organisms that are their food source?
The number of remaining organisms decreases.
The number of organisms reaches a balance and stays the same.
The number of organisms increases.
Some of the consumers evolve into predators.
What is considered deforestation? (Hint: 2 correct answers)
Cutting down one tree from your backyard
Cutting down trees to start a farm or build an airport
Cutting down a vast or mass amount of trees
Planting new trees
What harmful gas does the rainforest help to get rid of from our atmosphere because it absorbs it?
Oxygen
Carbon Dioxide
True or False: Deforestation can cause soil erosion.
True because the soil can get easily washed or blown away. This can cause flooding and landslides.
False because the soil should still stay in place and it would be hard for it to be washed or blown.
Biodiversity is ...
The amount of different living things (plants and animals) in an area.
The name of a habitat.
The adaptation of the animals and plants in the rainforest to all the rain.
True or False: Deforestation is a benefit to rainforest biodiversity.
True. Deforestation is good for biodiversity.
False. Deforestation lessens biodiversity.
The diagram below shows changes occurring in an ecosystem over time.
What is happening in the diagram?
Plants are growing larger over time.
Soil is being removed from an ecosystem over time.
An ecosystem is slowly being eliminated from a region.
Biological communities are gradually being replaced by other communities.
The diagram shows changes to a pond ecosystem over time.
Through which of the following processes are plant communities taking over the ecosystem?
biodiversity
primary succession
climate disturbance
secondary succession
The diagram below shows an example of ecological succession.
What does the presence of soil indicate about this process?
It is unchanging.
It is an example of primary succession.
It is an example of secondary succession.
It is an example of catastrophic change.
Primary succession occurs when pioneer species move into an area that has no plants. Which organisms are common pioneer species?
Conifer trees and tall grasses with roots that loosen the soil.
Mosses and lichens that can grow on rocky surfaces.
Grasses and weeds that arrive as seeds carried by the wind and then germinate in rich soil.
Vines and shrubs that help prevent the erosion of shallow soil.
Both primary and secondary succession begin with pioneer species that —
change the area and make it safer from predatory organisms.
invade the area so that new organisms cannot be established.
modify the area and allow larger and more complex organisms to appear.
use up all the existing resources and prevent establishment of non-native organisms.
How is the number of species in an ecosystem related to the stage of ecological succession?
The number of species increases as succession proceeds.
The number of species decreases as an ecosystem becomes mature.
The number of species present when succession begins remains the same.
The number of species increases and then decreases as succession proceeds.
How do pioneer species make ecological succession possible on an island following a volcanic eruption?
They use chemicals to produce food.
They establish homes in which animals can live.
They break down rock into soil in which plants can grow.
They adjust the climate by altering the average temperature in a region.
How is secondary succession different from primary succession?
Secondary succession occurs after a disturbance in an area that was previously uninhabited.
Secondary succession occurs after a disturbance in an area in which the soil has remained intact.
Secondary succession occurs over a longer period of time than primary succession.
Secondary succession occurs when animals are introduced to an area that had only plants.
An ecosystem experiences a volcanic eruption that covers the area with lava. Which of the following organisms is most likely to be a pioneer species in this ecosystem?
a tall tree
a shrub
moss
a mouse
Some students take care of a vegetable garden. When it is time to plant in the spring, the students leave part of the garden empty in order to observe ecological succession. Which of these will most likely occur first?
development of topsoil
growth of weeds and grasses
growth of trees and shrubs
development of a stream
