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WorksheetsScience
Total questions: 24
Worksheet time: 16mins
The picture shows a type of plant called kudzu. Kudzu is a fast-growing Asian vine that was introduced into the United States. Kudzu quickly uses available resources and can completely cover the plants in an area. What effect does the rapid growth of kudzu most likely have on an ecosystem?
The variety of native plants decreases
The water supply in the area increases
Weather patterns in the area change
The number of other plants increases
According to the chart, what would most likely happen in an ecosystem if there were a sudden decrease in the number of bacteria and fungi?
The number of plants would increase
The number of bees would increase
The amount of nutrients in the soil would decrease
The amount of water in the air would decrease
Clearing a forest to build a shopping mall will most likely result in woodpeckers —
nesting on roofs
losing habitat
laying more eggs
flying slower
The picture shows a frog in a pond containing duckweed. Which of these human activities would most likely cause an overgrowth of duckweed in a pond environment?
Gradually introducing geese into the pond
Fishing in the pond as recreation
Planting trees in nearby forests
Heavily fertilizing nearby farm fields
Mountain lions do not live near humans. As the human population increases, the mountain lion—
loses habitat
increases in population
adapts to city life
has more cubs
When trees develop leaves in the spring, changes occur on the forest floor. Why does the development of leaves cause changes on the forest floor?
Rainfall increases
Sunlight is reduced
Wind speed increases
Animal migration is stopped
What is a likely consequence of cutting down rainforests?
A decrease in the amount of air pollution on Earth
An increase in the number of plants living on Earth
A decrease in the variety of organisms living on Earth
An increase in the number of arctic ecosystems on Earth
The diagram shows an area before and after a housing development was built there. Tall pine trees grow very well in East Texas. However, these trees do not do well in parts of West Texas. Which of the following is MOST important in determining where a plant can grow and survive?
Wind
Climate
Tides
Sunshine
A science teacher bought some tomatoes that were still green and not yet ripened. He placed half of them in the refrigerator and half on a kitchen table at room temperature. After 4 days, the tomatoes in the refrigerator were still green, while those on the table were red and ripe. Which of the following is the BEST reason for the difference in ripening?
Tomatoes need sunlight to ripen
There was not enough air in the refrigerator
The tomatoes placed in the refrigerator were just bad
Tomatoes do not ripen well at cold temperatures
If a fire destroyed the grasses on a grassy plain, which animal would most likely be affected first?
Coyotes
Alligators
Rabbits
Red-tail hawks
Female seals usually return to the same beaches year after year to give birth. If they are repeatedly disturbed by humans at those beaches, how will the seals most likely respond?
They will change color
They will give birth to more pups
They will hunt for food more often
They will give birth at different beaches
Why would fewer bees come to a plant if the petals of its flowers were removed?
There would not be any nectar in the flowers
The bees would not be attracted to the flowers
The bees would not have a spot to land while sipping nectar
The bees would not be able to leave their scent on the flowers
Snakes feed on mice. The mice eat grain crops. When the crops are plentiful, what will MOST LIKELY happen?
The mouse population will decrease
The snake population will increase
The snake population will decrease
The mouse population will not change
A wetland was drained to build a mall. Two years later, there were no more toads in that area. Why did the toads disappear?
The toads were destroyed by the construction equipment
The toads died because toads cannot breathe out of water.
The toads were frightened and went into the woods
The toads got their food from the wetland ecosystem
Which of these might cause a forest habitat to become a desert?
No rain
Flooded rivers
High winds
Hot summers
In one study, scientists found that the number of raccoons increased where people built homes in the raccoons’ habitats. Which of the following is the MOST LIKELY reason why the number of raccoons increased?
Raccoons no longer lived in wild areas
Raccoons found more food living near humans
More predators of raccoons live near people’s homes
People destroyed raccoon habitats when they built homes
If disease removed a species of plant from a food web, how would that ecosystem MOST LIKELY be affected?
All of the plants in the ecosystem would become extinct
The organisms that eat the plant would become extinct
Consumers of the plant would have a smaller food source
Producers in the ecosystem would have a smaller energy supply
A gardener watered each of these pots with equal amounts of water. Only one pot was given fertilizer that increases the number of flowers on each plant. Which plant was PROBABLY given the fertilizer?
W
X
Y
Z
What might happen if the habitat of white-tailed deer decreases in size?
White-tailed deer will have more food
The number of white-tailed deer the habitat can support will decrease
The number of white-tailed deer will increase
Weaker white-tailed deer will survive longer
A certain type of wildflower grew in a sunny meadow. Over several years, nearby trees formed a shade canopy over the entire meadow. Many years later, the wildflowers no longer grew in the meadow. Which factor directly led to the extinction of this population of wildflowers?
The building of large cities
Pollution from nearby homes
Overpopulation of plant-eating organisms
A change in the wildflower’s habitat
Bison are grazing animals. They travel across a prairie, eating grass. If there were too many bison in an area, there would probably be—
fewer predators of bison
many other large grazing animals
tall shrubs and many trees
less grass and more bare soil
A woodland is cut down so a shopping center and many new houses can be built over the next two years. What will MOST LIKELY occur in the local ecosystem in the next five years?
Wildlife will compete less for food
More species of birds will live there
Water levels will be lower when it rains
Rain will wash more pollution into creeks
Highways allow people to travel between towns and cities. These highways also divide ecosystems into smaller pieces. Animals can become separated from lakes they use for breeding. For example, tiger salamanders travel long distances to breed at certain lakes. How could highway systems affect animals such as the tiger salamander?
Tiger salamander habitats may be exposed to less pollution
Tiger salamanders may be cut off from important resources
Tiger salamanders could improve their ability to remember roads
Tiger salamander habitats within ecosystems could become larger
If disease removed a species of plant from a food web, how would that ecosystem MOST LIKELY be affected?
All of the plants in the ecosystem would become extinct
The organisms that eat the plant would become extinct
Consumers of the plant would have a smaller food source
Producers in the ecosystem would have a smaller energy supply
