Human Impacts, Conservation & Tradeoffs — Practice · Grade 6 Science
Chapter: Ecosystems, Watersheds & ConservationWhat this practice covers
By the end of Human Impacts, Conservation & Tradeoffs you should be able to:
- I can explain why habitat loss affects more species than hunting does.
- I can explain how fertiliser running into water removes the oxygen from it.
- I can state the trade-offs involved in a conservation decision rather than only its benefits.
8 questions, written answer and multiple choice, each with a worked explanation.
Vocabulary used: conservation, tradeoff, evidence, system boundary, uncertainty.
Problem 1
Answer and explanation
They influence the mechanism and outcome; a planting label alone cannot guarantee a precise reduction.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 2
Answer and explanation
No. Define the relevant objectives and evaluate each with appropriate evidence.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 3
Answer and explanation
No. The cost constraint and other required outcomes matter; redesign or additional verified funding would need new evidence.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 4
Answer and explanation
Use matched rainfall and soil/slope conditions, repeat the method, and compare all records or a suitable unchanged reference.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 5
Answer and explanation
Mean sediment is 20 g bare and 12 g buffered, a reduction of 8 g or 40% relative to the bare mean. The buffer fits the stated budget and merits a bounded further test. Tray records do not guarantee a 40% field reduction in all storms; scale, plant establishment, maintenance, and other outcomes need study.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 6
Answer and explanation
No. Evaluate scientific accuracy, evidence, and tradeoffs rather than agreement with a preferred policy or personal belief.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 7
- One favorable measure proves a proposal meets every goal.
- conservation: Protecting or responsibly managing resources and ecological relationships through defined actions.
- A before-and-after difference always isolates the intended action as its cause.
- One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation
conservation: Protecting or responsibly managing resources and ecological relationships through defined actions.
Protecting or responsibly managing resources and ecological relationships through defined actions. Mean sediment is 20 g bare and 12 g buffered, a reduction of 8 g or 40% relative to the bare mean. The buffer fits the stated budget and merits a bounded further test. Tray records do not guarantee a 40% field reduction in all storms; scale, plant establishment, maintenance, and other outcomes need study.
Problem 8
- A before-and-after difference always isolates the intended action as its cause.
- One favorable measure proves a proposal meets every goal.
- tradeoff: A situation where improving one outcome can limit or worsen another valued outcome.
- One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation
tradeoff: A situation where improving one outcome can limit or worsen another valued outcome.
A situation where improving one outcome can limit or worsen another valued outcome. Mean sediment is 20 g bare and 12 g buffered, a reduction of 8 g or 40% relative to the bare mean. The buffer fits the stated budget and merits a bounded further test. Tray records do not guarantee a 40% field reduction in all storms; scale, plant establishment, maintenance, and other outcomes need study.