Topic Test Answers

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Which of the following represents change to an ecosystem brought about by abiotic factors?

A
the decrease in plant populations due to a decrease in the available water supply
B
the increase in a predator population due to the increase in prey population
C
the decrease in plant species due to herd grazing
D
the extinction of a plant species due to bacterial infection
2
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What discovery led Darwin to develop his theories on adaptation?

A
The Galapagos islands contain a range of habitats.
B
The Galapagos islands originate from volcanoes.
C
The birds Darwin found in the Galapagos were different types of finches, not separate types of birds.
D
Many of the organisms in the Galapagos lived in hostile environments.
3

Transitions between biomes do not have to be sharp and sudden, which means that different biomes can share characteristics.

A
T
B
F
4

A quaternary consumer species would be expected to have a smaller population than a secondary consumer species.

A
T
B
F
5

Organisms that have a physical trait that makes it easier for them to access food supplies are unlikely to pass on that trait to their offspring.

A
T
B
F
6

It is advantageous for a predator to prey exclusively on a single prey species.

A
T
B
F
7

What types of organisms will be affected by a decreased supply of water in an ecosystem?

A
Producers, consumers, and decomposers will be affected.
B
Producers and consumers will be affected.
C
Consumers and decomposers will be affected.
D
No organisms will be affected.
8

While trees are not the largest level in the pyramid of numbers, they are still the base for both the pyramids of biomass and pyramids of energy.

A
T
B
F
9

Which of the following is most likely to be a limiting factor for growth on the floor of a tropical rainforest?

A
water
B
shelter
C
sunlight
D
prey
10

Which of the following is not a part of Darwin’s theory of evolution?

A
Changes in organisms occur immediately.
B
Organisms change over time.
C
Species evolution occurs through natural selection.
D
Organisms developed from common ancestors.
11

Deer run in zigzag patterns when being chased by predators. What type of adaptation is this?

A
Behavioral
B
Physiological
C
Structural
D
Ecological
12

Justify why the predator/prey relationship is a community level interaction.

Answer not available
13

Explain how the elimination of a predator from an ecosystem might result in starvation amongst its prey species.

Answer not available
14

What distinguishes rainforests from temperate forests?

Answer not available
15

Explain what distinguishes primary and secondary consumers.

Answer not available

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