AnswersEnvironmental Science 2025-2026Global Connection: Why Invasive Species Thrive

Topic Test Answers

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1
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Which of the following attributes is characteristic of savannas but not of grasslands?

A
burrowing animals
B
droughts and fires
C
shrubs and isolated trees
D
a large number of grazing animals
2
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Which of the following changes in deciduous forests occurs in the winter?

A
Trees regain their leaves.
B
Trees block the flow of water and nutrients to their leaves.
C
The leaves of trees begin to lose their chlorophyll.
D
Trees live off of stored nutrients.
4

Which of the following is a characteristic differentiating tropical and temperate rainforests?

A
the location
B
the types of trees
C
the average temperature
D
all of the answers are correct
6

The marine biome _______.

A
is a large ecosystem, but not larger than some terrestrial ecosystems
B
is characterized by four different zones
C
has little species diversity
D
covers a small portion of the Earth’s surface
7

Vines most successfully compete for sunlight in tropical rainforests by _______.

A
climbing up into the canopy
B
strangling the trees they grow on
C
having broader leaves that absorb more light
D
having thick, woody stems
9

Which of the following adaptations enables deciduous trees to produce more food?

A
thick bark
B
stretching toward the sun
C
leaf loss
D
color change
10

Which of the following adaptations is typical of marine mammals?

A
thick layer of blubber
B
body covered in thick fur
C
webbed hands and feet
D
breathing apparatus on the sides of the head
12

The least amount of air movement in tropical rainforests is found in (the) _______.

A
top canopy
B
second layer of the canopy
C
third layer of the canopy
D
none of the above
15

The rainforest contains half of the Earth’s wildlife and at least two thirds of its plant species. It can hold great quantities of water and is very important to the planet’s water cycle. Rainforests remove vast amounts of CO2 from the atmosphere and replace it with oxygen. Which of the following statements best summarize the above information about rainforests?

A
The majority of the planet’s oxygen is generated from the rainforest.
B
Two-thirds of all plants originated from the rainforest.
C
The rainforest is a major catalyst for the planet’s water cycle.
D
The rainforest is important to life as a whole on the planet.
16

The greatest level of biodiversity in the tropical rainforest is found in the _______.

A
top canopy
B
second layer of the canopy
C
third layer of the canopy
D
the ground
17

Which of the following is a savanna?

A
Veldts
B
Plains
C
Steppes
D
Llanos
18

Organisms that live in deciduous forests have developed unique adaptations that aid in their survival. Which adaptation would be seen in the duckbilled platypus?

A
The duckbilled platypus reaches an adult length of 3 to 4 feet.
B
The duckbilled platypus lives near forests.
C
The duckbilled platypus gives birth to live young.
D
Males have venom glands on a spur on their hind feet.

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