Book E Ch 1 Modified Test

Explanation
The relationship described is mutualism. Mutualism is a type of symbiotic relationship where both species benefit from each other. In this case, the clown fish benefits from the protection provided by the sea anemone's stinging tentacles, while the sea anemone benefits from the clown fish bringing food to it.

Explanation
The independent variable in this experiment is the number of seeds planted in each container. This is the variable that is deliberately manipulated by the students to see if it has an effect on plant growth. By planting 2 seeds in one container and 8 seeds in the other, the students are testing the hypothesis that population density affects plant growth. They are comparing the growth of the plants in each container to determine if there is a difference in health, color, and stem thickness.

Explanation
A limiting factor refers to any factor that restricts the growth or size of a population. It can be a physical factor like availability of resources or a biological factor like predation or disease. These factors play a crucial role in regulating population size by limiting the number of individuals that can survive and reproduce in a given area. Therefore, the correct answer is "limiting factor".

Explanation
The role a species plays within a community is its niche. A niche refers to the specific position or function of an organism within its environment, including its interactions with other species and its utilization of resources. It encompasses the species' habitat, behavior, feeding habits, and other ecological factors that contribute to its survival and reproduction.

Explanation
The statement is false because carrying capacity refers to the maximum number of individuals that an environment can sustainably support. It is determined by factors such as the availability of resources, competition, predation, and disease. Carrying capacity does not restrict the number of individuals in a population, but rather represents the limit at which population growth stabilizes.

Explanation
The statement is false because a symbiotic relationship that benefits both species is actually referred to as mutualism, not commensalism. Commensalism is a type of symbiotic relationship where one species benefits while the other is neither harmed nor benefited.

Explanation
Meat eaters, such as tigers and frogs, are classified as carnivores because they primarily consume meat as their main source of nutrition. Carnivores have specific adaptations in their teeth, jaws, and digestive systems that allow them to efficiently hunt, capture, and digest animal flesh. This distinguishes them from herbivores, which primarily eat plants, and omnivores, which consume both plants and meat. Therefore, it is true that meat eaters like tigers and frogs are called carnivores.

Explanation
The statement is incorrect. Plant eaters like deer and rabbits are actually called herbivores, not omnivores. Omnivores are animals that consume both plants and other animals.

Explanation
The statement is false because producers found on the ocean floor do not use photosynthesis to create energy-rich molecules. Photosynthesis requires sunlight, which is not available in the deep ocean. Instead, producers in the deep ocean rely on chemosynthesis, a process that uses chemicals such as hydrogen sulfide to produce energy-rich molecules.

Explanation
An organism's habitat refers to the specific place or environment in which it naturally lives and obtains the resources it needs to survive. This includes factors such as climate, food availability, shelter, and other necessary conditions for the organism's existence. Therefore, the statement "The place in which an organism lives is called its habitat" is true because it accurately defines the term habitat and its relationship to an organism's living space.

Explanation
Worms are classified as decomposers because they play a vital role in breaking down dead organisms and organic matter. They consume dead plant material, animal remains, and other organic waste, breaking them down into smaller particles. This process helps to recycle nutrients back into the ecosystem, making them available for other organisms to use. Therefore, the statement that worms are decomposers and consume dead organisms is true.