A company purchased a large forest and cut the trees for lumber. Sunlight which had not reached the forest floor before was now very bright on the bare ground. Holly ferns began to grow rapidly because of increased access to light and moisture.Which population of organisms would be in direct competition with the Holly ferns for the same resources?
Plants need sunlight to perform photosynthesis. In the tropical rainforest, the survival of a plant depends upon its ability to adapt in order to reach sunlight.
Which of the following is an example of one such adaptation?
Which of the following is NOT an example of how biotic factors interact with abiotic factors in an ecosystem?
Which organisms are in competition for the same food source?
The graph below shows the percent of seeds from two plant species that sprout when grown in water containing different amounts of salt.
Which of the following best summarizes the effect of saltwater on these plant species?
Which organisms in the food web shown above compete for the same food source in this environment?
The graph below shows the range of water conditions preferred by three species of fish in an Ozark stream.
Water with which of these conditions would cause the most competition for resources among all three species of fish?
A scientist named Joseph Connell studied two species of barnacles on the shore of a Scottish island. In the area between the average tide and the neap high tide, he found that the population of Species A was smaller than that of Species B. He removed Species B from one area but left both Species A and B in a similar area. The graph below shows the results of this study.
Based on these data, which hypothesis was Connell most likely testing?
Black walnut trees produce a nontoxic chemical that becomes highly toxic when it is exposed to air or soil. How does this chemical help black walnut trees compete with plants growing nearby?
Molly filled up three 2 liter jars with aged water and stuck an aquarium thermometer inside each jar. After a couple of days, she added 1 stalk of Elodea to jar 1, 1 stalk of Elodea and 1 guppy to jar 2, and 1 guppy to the jar 3. Predict what happened in Molly’s experiment.
Wild Soay sheep live in a cold environment on a small Scottish island. The sheep used to be large because they gained extra weight during the summers in order to survive the harsh winters. A recent change in the island’s climate has caused grass to be available for a longer period each year, so survival conditions for the sheep have become less challenging.
Researchers who study these sheep have most likely observed a decrease in the wild Soay’s —
Some scientists studying aquatic plants notice that flooding often leads to a decrease in the rate of photosynthesis among aquatic plants. Flooding causes more sediment to be suspended in thewater. The increased sediment concentration decreases the amount of light that reaches the plants. Why does a decreased rate of photosynthesis lead to a decrease in a plant population?
Scientists are studying the effects of climate change on the Baltic Sea. Some scientists predict that if current trends continue, the Baltic Sea will become less salty, and it will contain less dissolved oxygen. As a result of these changes, the Baltic Sea will have less biodiversity. The location of the Baltic Sea is shown on the map below.
Which statement best explains why biodiversity in the Baltic Sea could decrease if these changes occur?
Copper compounds are used in large amounts to control the growth of algae and other aquatic plants. Copper interferes with photosynthesis in these organisms. What would be the most likely result of an accidental spill of these compounds in an aquatic environment?
The organism in the photo is a daphnia, or water flea. Daphnia are tiny aquatic organisms that live in most freshwater habitats. Adults range from less than 1 to 5 mm in length. They are good swimmers and eat mostly algae. Daphnia become mature at 5 to 10 days, and an adult female can produce up to 100 eggs every 3 or 4 days during its 2-month life span. When harmful algae rapidly increase in the daphnia’s environment, daphnia can develop adaptations to tolerate the negative effects of the algae within 10 years.
What characteristic of the daphnia allows the population to adapt to environmental change?
In Austin, Texas, a well-known salamander inhabits the waters of the spring outflows of Barton Springs. This is the perfect habitat for the Barton Springs salamander since it thrives in fresh and pure continuous flowing water. They may inhabit underground or surface environments. They have been observed in water, under and among rocks and gravel, as well as within plants and algae. They consume small aquatic organisms.
What is the most likely way that humans could have a damaging impact on the Barton Springs salamander?
Fossils of tropical plants and animals can be found buried in limestone rock in the North Texas area. These plants and animals are no longer found in this region.What is the most likely cause of the disappearance of these tropical plants and animals?