Indiana Science Grade 8

Chapter 18: Ecosystems

Ecosystems

1.
The gradual changes that happen in the types of species living in a region are called __________.
A)balance
B)community
C)succession
D)permafrost
2.
Primary succession begins in an area without __________.
A)soil
B)air
C)sunlight
D)wind
3.
The body of water where a river and an ocean meet is called __________.
A)a pond
B)an understory
C)an estuary
D)a wetlands
4.
Which of these factors helps determine the climate of a region?
A)the amount of precipitation
B)the impact of succession
C)the number of plant species
D)the amount of erosion
5.
In which aquatic ecosystem would you find ocean fish being raised for food for humans?
A)a coral reef
B)an estuary
C)an intertidal zone
D)a wetlands
6.
About what percentage of water on Earth's surface contains high concentrations of salt?
A)35%
B)95%
C)15%
D)65%
7.
Which of these biomes receives little annual precipitation?
A)taiga
B)tundra
C)temperate deciduous forest
D)grasslands
8.
Which of these biomes is considered the most biologically diverse?
A)grasslands
B)tropical rain forest
C)temperate deciduous forest
D)desert
9.
Because ponds tend to be filled with plant material, these bodies of water are usually high in __________.
A)acidity
B)salinity
C)permafrost
D)nutrients
10.
Which plant is typically found in grasslands?
A)rice
B)moss
C)corn
D)cactus
11.
__________ are usually shallow and filled with an abundance of plant and animal life.
A)Lakes
B)Ponds
C)Oceans
D)Rivers
12.
Which one of these is true of the tropical rain forest biome?
A)The soil contains permafrost.
B)The soil is thin and gravelly.
C)The soil thaws during the summer.
D)The soil contains little dead vegetation.
13.
Which of these animals might be found living in a taiga?
A)kangaroo rat
B)zebra
C)spotted owl
D)moose
14.
Which of the following animals can be found in a wetlands environment?
A)salamander
B)lemming
C)beaver
D)bear
15.
Which of these biomes receives the least amount of rainfall every year?
A)taiga
B)tropical rain forest
C)temperate deciduous forest
D)desert
16.
Taigas and grasslands are examples of __________.
A)estuaries
B)succession
C)canopies
D)biomes
17.
When is the intertidal zone covered with water?
A)during nighttime hours
B)at low tide
C)at high tide
D)during daylight hours
18.
Which of these is NOT a freshwater ecosystem?
A)wetlands
B)river
C)pond
D)reef
19.
The region below about 200 m in an open ocean is called the __________.
A)steppes
B)dark zone
C)canopy
D)understory
20.
Which biome typically has four distinct seasons?
A)temperate deciduous forest
B)tundra
C)desert
D)temperate rain forest
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