Ecology Unit Quiz 10
Which of the following have changed at a time and in a way that can explain recent climate warming?
- Volcanic activity.
- Greenhouse gas levels in the air.
- Solar activity as part of the sunspot cycle.
- The shape of Earth’s orbit around the sun and the tilt of the Earth on its axis.
Some coastal areas are more vulnerable to storms and beach erosion because mangrove forests or grass salt marshes have been cleared and removed by humans. This is most clearly an example of…
- physical disturbance.
- resource depletion.
- none of the above; it is not an example of environmental impact.
Wolves return to a river valley near Yellowstone National Park after a long absence. Which of the following are likely consequences? Select all that apply.When wolves return…
- survival and diversity of young trees will increase because grazing pressure will be reduced.
- abundance of elk and moose will increase because competition will be reduced.
- diversity of songbirds and other tree-dwelling species will increase.
- community diversity will collapse because wolves will eat everything.
Yeast are fungi that colonize overripe, dead fruit. They grow into the food source, secrete enzymes that break its molecules down, and absorb food molecules that are made available by this process. They are…
- Tertiary consumers
|Yellowstone Wolf Project Annual Report 2010|
What is the per capita death rate for 2010?
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.
- An insulated and sealed box. Neither energy nor matter can enter or leave the closed system.
- 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.
Which of the following communities has the greatest species richness?
- Community B: 89 species and 39,946 total organisms
- Community A: 109 species and 22,948 total organisms
Which of the following communities probably is least disturbed or polluted by human activities?
- A meadow with 23 native species of grass and 18 bird species
- A meadow with 11 native species of grass and 8 bird species
- A meadow with one species of grass and no birds
In the course of its biogeochemical cycling, lots of things can happen to a nitrogen atom. Which of the options below accurately describes what cannot happen to it?
- It will never be destroyed or converted to another element.
- It will never be mixed into water or become part of the ocean.
- It will never become incorporated into the protein molecules of a living organism.
- It will never become part of the air.
Which two activities are the main human activities that have led to increased levels of atmospheric carbon dioxide (CO2)?
- Burning fossil fuels and clearing forests
- Breathing and decomposition
- Fertilizer use and natural gas extraction
- Livestock production and rice paddy agriculture
Which best describes how impact changes with development of technology?
- Impact increases when human and animal power are extended by use of fossil fuels, but may later decline as more efficient and sustainable technologies are developed.
- As technology gets more advanced, impact becomes more severe.
- As technology gets more advanced, impact goes down because life is easier for people.
Which makes up most of the air and is a key component of proteins and nucleic acids?
Which of the following are probably members of a pond’s ecological community?Select all that apply.
- a population of fish that live in the pond
- a population of plants (lily pads) that live in the pond
- dissolved oxygen gas in the pond water
- a population of birds (great blue herons) that feed on the pond’s fish
- a population of birds that live in a forest near the pond but do not have any contact with or important influence on the pond’s organisms
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.
- 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.
- 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.
In the diagram below, the toad is at trophic level…