9th - 12th grade
The number of pythons found throughout Everglades National Park has increased in recent years. These huge snakes are not native to Florida and are believed to have been released into the wild by pet owners. Wildlife biologists have initiated attempts to capture and remove these pythons. Which statement best explains the biologists’ reason for removing these pythons from the Everglades?
Which of the following statements account for the change in population seen between years 7 and 8?
A new species of snake was introduced to a tropical region. Scientists then noticed a steady decline in the presence of field mice and an increase in the number of snakes. Which of these is the most likely explanation about why the population size of each animal changed?
The highest concentration of life exists in the top 200 meters of ocean water. What is the most important factor that influences the concentration of life?
Rabbits introduced into Australia over 100 years ago have become a serious pest to farmers. Rabbit populations increases so much that they displaced many native species of plant eaters. What is the most logical explanation for their increased numbers?
Scientists found, that over a period of 200 years, a mountain pond was transformed into a meadow. During that time, several communities of organisms were replaced by different communities. Which of these best explains why new communities were able to replace older communities?
Although phosphorus is of great biological importance, it is not very common in the biosphere. Why is this?
In the ocean nitrogen is often the limiting nutrient. What does this term mean?
Ecologists study different levels of organization within the biosphere. Identify which level corresponds to a group of individuals that belong to the same species and live in the same area.
In addition to energy, organisms need matter to survive. Which of the following is true about matter in the biosphere?
Each step in a food chain is called a trophic level. What percentage of energy available at one trophic level is transferred to organisms at the next level?
What is true about the pyramid of numbers?