Question 88 Sea otters have been used as an example of the \"Keystone Species\"
ID: 83748 • Letter: Q
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Question 88
Sea otters have been used as an example of the "Keystone Species" concept. This means that sea otters
interactions with the kelp forests and the sea urchins have not really had any consequences that need to be currently studied.
provide the carnivorous component of the food chain in which they live.
offer an opportunity for scientists to study the long-term effects as the sea otter populations are harvested.
promote the edge effect in the kelp forests off the northern coastline of California.
exert a particular strong influence on the structure and functioning of an ecosystem.
Question 89
In an ecosystem, which statement reflects the relationship with energy and nutrients?
Energy cycles through an ecosystem and nutrients flow in an ecosystem.
Energy cycles in an ecosystem and nutrients also cycle in a balanced ecosystem.
Energy flows through an ecosystem and nutrients cycle in an ecosystem.
In an unbalanced ecosystem, nutrients are stored in energy cycles.
Energy flows and nutrients flow through an ecosystem.
Question 90
Consuming wild animals in Africa as an unsustainable source of protein is referred to as:
mountain meat
bush meat
African delight
spam
savannah soufflé
Question 91
In a recent study of fish stocks, it was determined that if we do not change our commercial fishing practices, all marine stocks of fish will crash by the year:
2090
2048
2025
2100
2079
Question 92
The term ______________ is used to describe the various species and the relative abundance of each in a community.
biosphere
species richness
ecosystem
coexistence
diversity
Question 93
Of the following desalination plants, which produces the most potable drinking water per day?
Sorek (Israel)
Jamnagar (India)
Carsbad (USA)
Magtaa (Algeria)
Handy (China)
Question 94
Which of the following significantly contributes to the greenhouse effect and global warming?
the release of chlorine from industrial processes.
restricting destruction of forests.
pumping large quantities of sulfur-containing gases into the atmosphere.
the purchase of heavy, high profile vehicles that have poor gas mileage.
decomposition of waste.
Question 95
A scientist studied peregrine falcons to determine why the numbers of birds was declining. She determined that they were succumbing to the same environmental contaminant as brown pelicans, which meant that
global warming (too much carbon dioxide) had increased the death rates in the newly hatched chicks.
the falcons had lost much of their habitat due to human developments.
the levels of DDT in the environment were having a detrimental effect on eggs (causing the eggshells to be too thin) that were being laid by the female falcons.
the genetic diversity of the falcons was too low to sustain their population level.
the falcon's habitat had been fragmented and the subsequent edge effect affected their ability to hunt for prey items.
interactions with the kelp forests and the sea urchins have not really had any consequences that need to be currently studied.
provide the carnivorous component of the food chain in which they live.
offer an opportunity for scientists to study the long-term effects as the sea otter populations are harvested.
promote the edge effect in the kelp forests off the northern coastline of California.
exert a particular strong influence on the structure and functioning of an ecosystem.
Explanation / Answer
88. A keystone species is a plant or animal that plays a unique and crucial role in the way an ecosystem functions. Sea otters exert a particular strong influence on the structure and functioning of an ecosystem.These mammals feed on sea urchins, controlling their population. If the otters didn't eat the urchins, the urchins would eat up the habitat's kelp. Kelp, is a major source of food and shelter for the ecosystem.
89. Energy flows through an ecosystem and nutrients cycle in an ecosystem.
90. Consuming wild animals in Africa as an unsustainable source of protein is referred to as: bushmeat.
92. species richness and species evenness are the components of diversity.Thus term diversity is used to describe the various species and the relative abundance of each in a community.
94.restricting destruction of forests is one of the main reasons for global warming.
95.the levels of DDT in the environment were having a detrimental effect on eggs (causing the eggshells to be too thin) that were being laid by the female falcons is the main reason.
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