Free Printable WorksheetScienceGrade 7Science CurriculumSCI.7.65

7.65 Analyzing Local Water Quality Data Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Grade 7 Science worksheet provides structured practice on 7.65 Analyzing Local Water Quality Data. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Analyzing Local Water Quality Data - Which interpretation of local water quality data best indicates stream health? (NGSS SEPs: Analyzing Data)

Whether you are an educator preparing classroom handouts, a tutor reinforcing weekly topics, or a parent supporting homeschool learning, this printable resource gives students the deliberate practice required to achieve subject fluency and master state standards.

Grade

Grade 7

Subject

Science

Domain

Science Curriculum

Formats

PDF & DOCX

Sample Practice Problems

Preview the types of problems and questions covered in this worksheet

Below are sample questions representative of the exercises included on this worksheet and related 7.65 Analyzing Local Water Quality Data skill assessments:

Problem 1Difficulty: Mastery

Which interpretation is best supported by the data about stream health?

APark entrance looks healthiest because it shows low DO (3.9 mg/L), high turbidity (55.4 NTU).

BBelow the storm drain looks healthiest because it shows higher DO (9.4 mg/L), high turbidity (51.1 NTU).

CAbove the farm road looks healthiest because it shows higher DO (7.4 mg/L), high turbidity (51.2 NTU).

DDownstream (near ball fields) looks healthiest overall because it shows higher DO (8.7 mg/L), lower turbidity (4.8 NTU) compared with the other sites.

Solution & Explanation:To decide which site indicates the best stream health, compare multiple indicators. Healthier sections usually have higher dissolved oxygen, clearer water (lower turbidity), fewer nutrients and bacteria, and pH closer to neutral. The best-supported interpretation is the site that has the most favorable combination.

Problem 2Difficulty: Mastery

Which interpretation is best supported by the data about stream health?,A. Above the farm road looks healthiest because it shows higher DO (7.2 mg/L)

Ahigh turbidity (17.3 NTU).

BBefore the bend looks healthiest because it shows low DO (5.3 mg/L)

Solution & Explanation:lower turbidity (3.4 NTU) compared with the other sites. | D. Wetland edge looks healthiest because it shows low DO (3.3 mg/L)

Problem 3Difficulty: Mastery

Which interpretation best indicates the stream’s health based on these data?

AThe data prove the stream is healthy because oxygen never changes during a day.

BThe stream is definitely healthiest because oxygen is highest in the afternoon.

CEven though afternoon oxygen is high, the very low pre‑dawn oxygen suggests an algae-driven oxygen crash, which is stressful for stream life.

DThe stream must be healthy because nitrates and phosphates always increase oxygen at night.

Solution & Explanation:A large day–night swing with very low pre‑dawn DO can happen when algae grow from excess nutrients. At night, algae and other organisms respire and can drive oxygen dangerously low, which harms stream health.

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Grade 7 Science students. It aligns with educational standard SCI.7.65 (Grade 7 science practice focused on analyzing local water quality data.).