A stream has fast-flowing water. Which organism would be better adapted to this condition?, An organism that floats freely, An organism that can cling to rocks, An organism that cannot tolerate currents, An organism that needs still water, A river becomes warmer after nearby trees are removed. What could happen next?, Dissolved oxygen may decrease, Water depth must increase, Salt levels must increase, Water flow must stop, A farmer notices algae growing excessively after heavy fertilizer use. What is the most likely cause?, Reduced sunlight, Nutrient runoff, Lower water depth, Stronger water flow, A riverbank loses most of its vegetation. After heavy rain, the water becomes muddy. What is the best explanation?, Vegetation loss increased erosion, Vegetation loss increased oxygen, Rainfall removed all nutrients, Trees normally stop water flow, Scientists find fewer fish in a stream with very low dissolved oxygen. Which conclusion is most reasonable?, Low oxygen may be affecting aquatic organisms, Fish populations increase in low oxygen, Dissolved oxygen has no ecological role, Fish require saltwater to survive, A community wants to improve a polluted river. Which action addresses the problem at its source?, Remove dead fish, Reduce wastewater entering the river, Add more fish, Remove aquatic plants, Two river sections are compared. Section A has vegetation and many organisms, while Section B has little vegetation and fewer organisms. What is the best inference?, Vegetation can provide habitat, Vegetation causes pollution, Organisms avoid healthy habitats, Trees eliminate aquatic life, A student observes algae → snail → fish. What does this sequence show?, Nutrient recycling, Energy flow through feeding, Water movement, Habitat destruction, If algae in a river decrease greatly, which organism could be affected first?, Snail, Larger fish, Decomposer, Riverbank tree, A river receives excessive nutrients and algae rapidly increase. Why could this eventually harm fish?, It can contribute to oxygen depletion, It always increases water clarity, It stops nutrient cycling, It makes the river saltwater, A town can either clean visible garbage once or reduce pollution entering the river continuously. Which is the better long-term approach?, Remove garbage once, Reduce pollution sources, Remove all river plants, Increase fishing, A construction project removes vegetation beside a stream. Which consequence should environmental planners be most concerned about?, Increased erosion and sediment, Increased freshwater production, Reduced rainfall, Increased riverbank vegetation, A student claims, “Rivers only contain living organisms.” Which observation best challenges the claim?, Rivers contain water, rocks, and dissolved nutrient, Fish live in rivers, Algae perform photosynthesis, Frogs use rivers as habitats, A community wants to protect a river while maintaining its biodiversity. Which strategy is most appropriate?, Protect riverbank vegetation and control pollution, Remove aquatic plants, Increase waste disposal near the river, Remove organisms from the food web, A river ecosystem is experiencing pollution and habitat degradation. Which plan would best support its recovery?, Control pollution and restore riverbank vegetation, Increase fishing and remove plants, Remove rocks and increase construction, Add more waste and reduce monitoring

B. TEST YOUR KNOWLEDGE

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