1. A mushroom is observed growing on a fallen log. How is the mushroom interacting with the log?
- A. It is using the log purely for physical support to get closer to sunlight.
- B. It is consuming the wood from the log as food to build its own body.
- C. It is providing the dead log with nutrients to help it grow again.
- D. It is simply resting on the log without any interaction.
2. Which of the following is a fundamental characteristic of all decomposers?
- A. They have leaves.
- B. They are living things.
- C. They are non-living.
- D. They produce their own food.
3. What is the primary reason decomposers, like fungi and bacteria, break down dead organic matter?
- A. To convert sunlight directly into chemical energy for plants.
- B. To use the matter as a source of food for their own life processes, growth, and repair.
- C. To create shelter for small insects and animals within the soil.
- D. To release clean water into the environment.
4. In what fundamental way are decomposers similar to animals?
- A. They both perform photosynthesis.
- B. They are both capable of hunting live prey.
- C. They both consume other organisms for energy.
- D. They both have roots to absorb nutrients.
5. Which statement accurately describes the nature of a decomposer?
- A. It is a non-living chemical process that breaks down rocks.
- B. It is a living organism that eats dead material to survive and grow.
- C. It is a type of plant that does not require sunlight.
- D. It is an environmental condition like rain or wind.
6. What is the primary function of decomposers within a soil ecosystem?
- A. To produce energy for plants through photosynthesis
- B. To break down dead organic matter and return its nutrients to the soil
- C. To pack the soil tightly to prevent erosion from wind and water
- D. To consume living plants, creating more space for new seedlings to grow
7. Which statement best describes the relationship between decomposers and plants?
- A. Decomposers are harmful to plants because they consume dead roots.
- B. Plants provide the primary food source for decomposers after they die.
- C. Decomposers and plants compete for the same sunlight and water resources.
- D. Decomposers make soil less fertile, forcing plants to adapt or die.
8. What is a direct result of increased decomposer activity in a garden?
- A. An increase in soil fertility.
- B. A decrease in soil moisture.
- C. An increase in soil sand content.
- D. A decrease in the number of plants.
9. A gardener notices that the soil in their garden is dark and crumbly. What does this observation most likely indicate about the soil?
- A. The soil has too much sand.
- B. The soil is lacking water.
- C. The soil has a healthy population of decomposers.
- D. The soil is too compacted for roots to grow.
10. If a forest ecosystem suddenly lost most of its decomposers, what would be the most likely long-term consequence?
- A. Dead leaves and wood would accumulate without breaking down, and soil nutrient levels would drop.
- B. Plants would grow much larger and faster due to a lack of organisms eating them.
- C. The soil would become darker and more crumbly as minerals are exposed to the air.
- D. The amount of sand and rock in the soil would decrease significantly over time.