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8.93 Populations, Resources and Carrying Capacity Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Grade 8 Science worksheet provides structured practice on 8.93 Populations, Resources and Carrying Capacity. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Populations, Resources and Carrying Capacity - Which interpretation best data on resource availability and its effects on organisms and population sizes over time? (NGSS MS‑LS2‑1; TEKS §112.28 Grade 8; FL NGSSS; VA SOL; MA STE)

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 8

Subject

Science

Domain

Science Curriculum

Formats

PDF & DOCX

Sample Practice Problems

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Below are sample questions representative of the exercises included on this worksheet and related 8.93 Populations, Resources and Carrying Capacity skill assessments:

Problem 1Difficulty: Mastery

A scientist studies a population that levels off near 1,000 individuals. She then increases the habitat area by 25% without changing food density (food per square meter stays the same).

Which prediction is most consistent with the concept of carrying capacity?

ACarrying capacity will likely increase by about 25% (to around 1,250) because total available food and space increase with habitat area.

BCarrying capacity will decrease because habitat area increased.

CCarrying capacity will stay at exactly 1,000 because K cannot change.

DThe population will immediately jump to 1,250 without any time passing.

Solution & Explanation:If food density stays the same but area increases, total food and space increase. That can raise carrying capacity roughly in proportion to area (about 25%). The population would approach the new K over time, not instantly. Option A best matches.

Problem 2Difficulty: Mastery

A population of insects lives on a seasonal plant. Each year, the plant dies back in winter and regrows in spring. The insect population peaks each summer but the peak size steadily drops over 10 years.,Science Possible causes:,,Science 1) Gradual loss of soil nutrients reduces plant regrowth each spring.,,Science 2) A new predator appears but only in winter.,,Science 3) A one-time storm in Year 2 removed many insects, but conditions returned to normal afterward.,Science

,,Science Which cause best explains the long-term decline in the summer peak sizes," and why?,A. Cause 1

Solution & Explanation:because a winter-only predator would steadily increase the summer peaks. | C. Cause 3

Problem 3Difficulty: Mastery

A population is limited by two resources: nesting sites (S) and food (F). A researcher measures which resource is limiting by adding only one resource at a time. Results (stable population size): Baseline: 500 Add nesting sites only: 520 Add food only: 900 Add both nesting sites and food: 910

Which interpretation is best supported?

ANesting sites are the primary limiting factor.

BFood is the primary limiting factor; nesting sites are secondary or not limiting at baseline.

CBoth resources are equally limiting because both increase the population a little.

DNeither resource limits the population.

Solution & Explanation:Adding food causes a large increase (500→900), while adding nesting sites causes only a small change (500→520). Adding both is only slightly higher than food alone, so food is the primary limiting factor. Option B is correct.

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Grade 8 Science students. It aligns with educational standard SCI.8.93 (Explain how resources limit populations and affect carrying capacity.).