investigate how organisms and populations in an ecosystem depend on and may compete for biotic and abiotic factors such as quantity of light, water, range of temperatures, or soil composition
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Q 1/5
Score 0
(8.11A) A group of scientists studied some trees in a pine forest. In the densely forested areas, the trees were within 1 m of each other. The scientists observed that these trees had dead branches near the ground. They measured the height above ground at which the first living branches were found on different sized trees in the forest. Then they repeated this procedure on the same kind of trees in an open meadow. The graph summarizes their data.
Which inference is best supported by these data?
45
Pine trees in a dense forest compete for sunlight with the surrounding trees.
Pine trees in a dense forest have more living branches than pine trees in an open meadow.
Pine trees in a dense forest are part of a less complex food web than pine trees in an open meadow.
Pine trees in a dense forest can grow taller than pine trees in an open meadow.
Q 2/5
Score 0
(8.11A) An invasive species is a species that causes harm to other species by taking over a new ecosystem. Populations of invasive species tend to increase much faster than populations of other species. One reason that invasive species might be so successful is that they -
45
are usually from a different area of the world.
have fewer competitors than other species in the ecosystem.
are often cared for by people in the area.
tend to be larger than other species in the ecosystem.
5 questions
Q.
(8.11A) A group of scientists studied some trees in a pine forest. In the densely forested areas, the trees were within 1 m of each other. The scientists observed that these trees had dead branches near the ground. They measured the height above ground at which the first living branches were found on different sized trees in the forest. Then they repeated this procedure on the same kind of trees in an open meadow. The graph summarizes their data.
Which inference is best supported by these data?
1
45 sec
8.11.B: Organisms and Environments
Q.
(8.11A) An invasive species is a species that causes harm to other species by taking over a new ecosystem. Populations of invasive species tend to increase much faster than populations of other species. One reason that invasive species might be so successful is that they -
2
45 sec
8.11.B: Organisms and Environments
Q.
(8.11A) A scientist added bacteria and a nutrient medium that could support the growth of the bacteria to a sterilized petri dish. No other materials were added. The graph models growth of the bacteria over time.
Which of these most likely explains why the bacterial population stopped growing?
3
45 sec
8.11.B: Organisms and Environments
Q.
(8.11A) Whitetip reef sharks spend most of the day lying on the ocean floor. While remaining still, these sharks pump water across their gills.
The movement of water across their gills is necessary for -
4
45 sec
8.11.B: Organisms and Environments
Q.
Both primary and secondary succession begin with pioneer species that
