Question 1 Select one answer. 10 points Which consumer population in the system
ID: 50082 • Letter: Q
Question
Question 1
Select one answer.
10 points
Which consumer population in the system below would probably have the most energy available to it?
Aphid
Clover
Ladybug
Toad
Question 2
Select one answer.
10 points
How have human activities influenced the nitrogen and/or phosphorus cycles?
Human activities have increased the level of phosphorus in the earth’s atmosphere.
Humans have not affected these cycles.
Human activities have increased the nitrogen and phosphorus available to plants and algae.
Human activities have led to storage of more nitrogen in the earth’s crust.
Human activities have reduced the nitrogen and phosphorus available to plants and algae.
Question 3
Select one answer.
10 points
Starting in the 1950s, populations of Atlantic cod were heavily fished by highly efficient commercial trawlers. Catches started to decline in the 1970s and by 1990 several of the fisheries were completely depleted. Was the cod population a renewable resource when fished at that level?
No, because growth and reproduction of the fish couldn’t keep up with the harvest.
Yes; plant and animal populations are always renewable resources.
Question 4
Select all that apply.
10 points
Which actions could be taken to help increase a population of an endangered species? Select all that apply.
Breed individuals in captivity and release their offspring to suitable habitats.
Protect the species against hunting, fishing, or gathering.
Introduce predators that kill and eat the species, thereby preventing overpopulation.
Introduce insects that pollinate an endangered plant, increasing its rate of seed production.
Use contraceptive darts to reduce the birth rate so the population stays at its carrying capacity.
Question 5
Select one answer.
10 points
What is the population density?
97
126
93
0.01
Question 6
Select one answer.
10 points
Which two activities are the main human activities that have led to increased levels of atmospheric carbon dioxide (CO2)?
Fertilizer use and natural gas extraction
Livestock production and rice paddy agriculture
Breathing and decomposition
Burning fossil fuels and clearing forests
Question 7
Select all that apply.
10 points
Which of these are limiting factors? Select all that apply.
Food availability
Fire
Disease
Availability of nesting sites
None of these choices
Question 8
Select one answer.
10 points
Which is the best analogy for Earth as a global ecosystem? Earth is like...
A wire cage. Both energy and matter can freely enter and leave the Earth.
A sealed but transparent box. Energy enters as light and leaves as heat, but matter is sealed in a closed system and must be recycled.
An insulated and sealed box. Neither energy nor matter can enter or leave the closed system.
Question 9
Select one answer.
10 points
What is the per capita death rate for 2010?
11
0.09
0.001
88
Question 10
Select one answer.
10 points
The following are estimates from the U.S. Census Bureau’s International Database. They are averages for populations in two different groups of countries in 2012.
Group A: Total fertility 1.6 births per woman over a lifetime, life expectancy 78 years at birth, and population growth rate 0.3 % per year.
Group B: total fertility 2.6 births per woman over a lifetime, life expectancy 66 years at birth, and population growth rate 1.3 % per year.
Which group represents the population of less developed countries, including most of Africa, Asia, and Latin America?
Members of Group A are from the less developed (lower income) nations.
Members of Group B are from the less developed (lower income) nations.
Question 11
Select one answer.
10 points
Approximately how much energy is passed from one trophic level to be stored as growth in the bodies of organisms at the next level?
90%
10%
20%
50%
Question 12
Select one answer.
10 points
Elements important to life are cycled through living things, air, soil, and water, but they do not take form as rocks.
False
True
Question 13
Select one answer.
10 points
A limiting factor will tend to cause...
both birth and death rate to decrease
birth rate to increase and/or death rate to decrease
both birth and death rate to increase
birth rate to decrease and/or death rate to increase
Question 14
Select one answer.
10 points
Energy enters Earth’s ecosystems as _________ and exits as ___________.
sunlight; heat
sunlight; carbon dioxide
heat; sunlight
heat; organic matter
Question 15
Select one answer.
10 points
Three anglers are arguing about how a lake’s fish population should be managed. Historically the lake has been totally closed to human fishing. For many years it has held a steady population of about 100,000 fish. Managers are planning to open the lake to fishing with a limited harvest. To decide on the harvest limits, they first need to set a goal. Select the strategy that would probably generate the largest sustainable harvest of fish each year.
Frank thinks that it is most important to keep the population small so the fish won’t compete with each other. He thinks the population size should be kept close to 20,000 and rules should be set so it will not fall below 10,000.
Ricardo thinks that it would be better to have a moderate number of fish. He thinks that the population should be kept close to 60,000 fish and rules should be set so that the number never drops below 50,000.
Angela thinks that having a lot of fish in the lake is the most important thing. She thinks the population should be kept close to 100,000 fish and rules should be set so that the number never drops below 90,000.
Yellowstone Wolf Project Annual Report 2010 Variable Value in 2010 N (population size) 97 annual number of births 38 annual number of deaths 9 total land area 8,987 km 2Explanation / Answer
Answer 1: Aphid
Since clover is a plant, so the next level organism, i.e. the aphids will have the maximum energy available.
Answer 2: Human activities have increased the nitrogen and phosphorus available to plants and algae
This has happened in form of chemical fertilizers which are used to increase the productivity of the plants.
Q-Which actions could be taken to help increase a population of an endangered species? Select all that apply.
Answer:
Breed individuals in captivity and release their offspring to suitable habitats.
Protect the species against hunting, fishing, or gathering.
These two are the correct options to increase the population of endangered species. Educating the people living near forest zones about not hunting or cutting down trees will prevent the species from getting extinct.
Q- Which two activities are the main human activities that have led to increased levels of atmospheric carbon dioxide (CO2)?
Answer: Burning fossil fuels and clearing forests
There has been a drastic increase of automobiles in the world and this has increased the use of fossil fuels. These release carbon dioxide in the air. Also deforestration will also increase the load of CO2.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.