A marine ecosystem is represented below.
What is lost to the environment at each of the trophic levels of this ecosystem?
A marine ecosystem is represented below.
What is lost to the environment at each of the trophic levels of this ecosystem?
A marine ecosystem is represented below.
What is lost to the environment at each of the trophic levels of this ecosystem?
In any environment or ecosystem, organisms can have several different types of relationships. Three types of relationships are described below.
Which of these correctly describes the relationships between the organisms?
Burning fossil fuels releases large amounts of carbon dioxide gas. The resulting increase in carbon dioxide levels has caused global temperatures to increase over time. The increase in mean global temperatures over time is shown in the graph.
Which TWO statements describe the MOST LIKELY impacts of the increasing global temperatures shown in the graph?
The table shows the growth of a population of bacteria over a 10-hour period.
Which statement is BEST supported by the data?
A tropical region experiences unusually high rainfall, leading to widespread flooding that increases standing water. However, mosquito populations decrease significantly afterward. Based on ecological principles, which of the following is the most likely explanation?
Which of the following best explains why not all non-native species are invasive?
Which graph best summarizes the relationship between the biodiversity of an ecosystem and its stability?
Scientists gathered data about two populations of animals that are found in the same ecosystem.
What can be inferred from the data about the populations?
The diagram models available energy in a meadow ecosystem.
In a square kilometer of the meadow ecosystem, mice consume 125,000 kcal of grasses per year. About how much energy is available to hawks per square kilometer per year?
What is a good hypothesis based on the except?
Giovanni is doing an experiment to see what temperature produces the most mold on bread. Normally her bread sits at room temperature on the counter. She will try putting her bread in the refrigerator, in a warm incubator, and on the counter. She will measure how long it takes for mold to grow on each loaf of bread.
A study was made of endangered birds to see if their populations were increasing by
being protected from hunters. Scientists went out into the field every ten years and
counted the number of Whooping Crane, California Condor, and Black Swans they
found in their spring feeding grounds. Review the data table below.
What is a good title for the graph?
A student designed an experiment to study the transpiration through the leaves of a tomato plant (Solanum lycopersicum). Measurements were taken in the initial conditions with five leaves on a tomato shoot and then again after each of the five leaves was removed.
Describe the trend in the data.
A student is asked to draw a food web in which the same organism is a primary consumer as well as a secondary consumer. How should the organism be represented in the food web?
The diagram below represents the nitrogen cycle in a student’s aquarium. Ammonia, nitrites, and, to a lesser degree, nitrates can be harmful to fish. The student wants to keep the nitrogen in this aquarium cycling normally without having to continually change the water.
Which of the following should the student add more of to help remove nitrates and improve the natural cycling of nitrogen in this aquarium?
Which biogeochemical cycle is necessary to recycle the element necessary to proteins/amino acids and DNA?
Which biogeochemical cycle is necessary to recycle the element necessary to produce all molecules needed for life?
What process in the carbon cycle involves the breakdown of organic carbon compounds by decomposers, releasing CO2 into the atmosphere?
Which biogeochemical cycle does not involve an element returning to the atmosphere?
Examine the diagram. Which arrow represents combustion of fossil fuels?
The diagram to the right is a representation of a carbon cycle.
Which arrow represents cellular respiration?
One of the main ways CO2 is removed from the atmosphere is _______________.
A terrestrial food web is shown below.
Which of the following lists only organisms that are secondary consumers in this food web?
Which of the following molecules typically contains both nitrogen and phosphate?
The Texas blind salamander (Eurycea rathbuni) lives in the Edwards Aquifer region around San Marcos. Along with other species the salamander lives in total darkness in the underground crevices and caves of the aquifer region. The table lists some of the organisms that live in this environment and their food sources.
In an energy pyramid for these aquifer cave dwellers, which of the following would be placed at the bottom?
This diagram demonstrates why the ocean is a large carbon sink.
An increase in the amount of carbon dioxide in the atmosphere can cause atmospheric temperatures to increase. Which statement explains how this could affect the ocean as a carbon sink?
37 Four common relationships between organisms are listed in the box.
Which statements best describe these relationships?
Photosynthesis and cellular respiration both involve the use and release of gases. Which statement correctly identifies the role of gases in the two processes?
Which of the following gases is NOT considered a greenhouse gas?
Examine the data table below.
What is the effect of salinity on the biodiversity level?
The graph below shows the sea surface temperatures (SST) in a coral reef ecosystem over the past decade.
Based on the graph, which conclusion about coral bleaching events is supported?
Which of the following are least likely to be present during primary succession?
The graph below shows the growth of two populations of paramecia grown in the same culture dish for 14 days. Which ecological concept is best represented by the graph?
The diagram shows the flow of organic molecules through an ecosystem. One process that occurs in this ecosystem is labeled X, and another process that occurs is labeled Y
Which two processes are identified by the labels X and Y?
Surtsey is an island located south of Iceland. The island was formed by a volcanic eruption and first appeared in 1963. The table below contains descriptions of changes in the population and diversity of species on Surtsey.
Which of these lists the descriptions in the correct order of ecological succession on Surtsey?
What describes a pioneer species in an ecosystem?
What is primary succession?
Which is an example of primary succession?
A new predator of rabbits has been introduced within an ecosystem. This new predator runs faster than the native predators of rabbits.
Which statement describes what will most likely occur in the rabbit population due to the introduction of the predator?
What would be the most likely effect of a wildfire that burned a large area of a forest?
The San Marcos salamander, Eurycea nana, is a light reddish-brown translucent salamander about 2–5 cm in length. E. nana is found only in Spring Lake and a portion of the San Marcos River.
Which human activity would most likely decrease the ability of the salamanders to survive?
A partial Texas food web is shown.
The populations of which organisms will most likely increase as a result of a disease that suddenly reduced the population of Texas horned lizards?
A biomass pyramid of an ecosystem is shown.
Which statement provides the best explanation for the difference in biomass of organisms found at each trophic level?
The diagrams show a partial food web containing the Glyptapanteles wasp and the life cycle of this wasp.
Based on the two diagrams, which list correctly identifies the relationships Glyptapanteles wasp larvae have with other organisms?
Grassland ecosystems in Texas have evolved to depend on periodic fires to return nutrients to the soil and encourage plant reproduction. Humans have prevented fires in many of these grassland areas, resulting in plant and animal communities with little diversity. Wildlife biologists often recommend purposefully starting fires called prescribed burns, which are monitored and controlled, in grassland ecosystems every 3 to 4 years. These biologists observe greater diversity in plant and animal life in the years following a prescribed burn.
What natural processes are the biologists attempting to imitate?
The flow of energy in a grassland ecosystem is shown.
Based on the diagram, which two populations best represent trophic levels that receive the LEAST amount of the total energy provided to the ecosystem by the grass?
In an experiment, two plants are grown together for a time and then separated. Plant 2 is a parasite of Plant 1.
Which graph best predicts the growth of Plant 1 and Plant 2 during the experiment?
The concentration of a toxic chemical is magnified ten times at each trophic level. What will the concentration of the toxin be in organisms at the fifth trophic level if primary producers have concentrations of 40 parts per million?
What is the primary reason mercury concentration increases at higher trophic levels?
