1. A farmer has a field with soil that is very low in nitrogen. The area receives plenty of rainfall and sunlight. What will be the primary effect of adding a large amount of phosphorus-rich fertilizer to the field?
- A. The crop growth will significantly increase.
- B. The crop growth will not increase.
- C. The amount of sunlight will become the new limiting factor.
- D. The plants will absorb more water.
2. Imagine you are building toy cars. Each car requires 1 body, 4 wheels, and 2 axles. You have 50 bodies, 120 wheels, and 80 axles. What is the limiting factor that determines the maximum number of cars you can build?
- A. The car bodies
- B. The axles
- C. The wheels
- D. The total number of parts available
3. In a desert environment, plant growth is severely restricted. Despite intense and abundant sunlight, the overall biomass is low. What is the most probable limiting factor for plants in this ecosystem?
- A. Sunlight
- B. Oxygen
- C. Herbivores
- D. Water
4. If a specific resource is identified as the limiting factor for a population, what would be the expected outcome of significantly increasing the availability of that one resource?
- A. The population would decline due to resource toxicity.
- B. The population would continue to be limited by other factors and show no change.
- C. The population would increase until it becomes limited by a different factor.
- D. The population would become extinct.
5. In an ecosystem, which of the following best defines a 'limiting factor'?
- A. The resource that is most abundant and available for all organisms.
- B. The resource that is in the shortest supply relative to the needs for growth and reproduction.
- C. Any non-living element in the environment, such as temperature or sunlight.
- D. The total number of predators that control the population of a specific species.
6. If all carbon dioxide were suddenly removed from a plant's environment, which process would immediately stop?
- A. Absorption of water by the roots
- B. The synthesis of sugar molecules
- C. Cellular respiration in the mitochondria
- D. The release of water vapor through stomata
7. In an ecosystem where all atmospheric CO₂ has been depleted, why would a herbivore, like a deer, eventually face starvation?
- A. The deer would be unable to perform cellular respiration.
- B. Decomposers would stop recycling nutrients in the soil.
- C. Plants would be unable to produce the energy storage molecules the deer eats.
- D. Increased solar radiation would make the environment too hot for the deer to survive.
8. Imagine a sealed glass terrarium containing plants and insects. If photosynthesis has stopped because the plants have used up all the carbon dioxide, what single action would restart the process?
- A. Adding more water to the soil.
- B. Increasing the intensity of the light source.
- C. Introducing a source of carbon dioxide.
- D. Adding nutrient-rich fertilizer to the soil.
9. If a sudden environmental change caused atmospheric CO₂ levels to drop to near zero, which trophic level would be the first to experience a direct negative impact on its ability to create new biomass?
- A. Producers
- B. Decomposers
- C. Primary Consumers
- D. Secondary Consumers
10. What is the primary role of carbon dioxide in the process of photosynthesis?
- A. It acts as the primary source of energy for the chemical reactions.
- B. It provides the carbon atoms needed to construct glucose molecules.
- C. It helps transport water from the roots to the leaves.
- D. It captures sunlight, which is then converted into chemical energy.