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Free US Common Core Common Core US Biology
Practice Paper

8 mixed-difficulty practice questions in the style of real US Common Core Common Core papers — answers, mark-scheme-style explanations, and the official exam structure all on one page.

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What the real US Common Core Common Core US Biology paper looks like

Paper 1
Objective and short-answer questions covering the breadth of the specification.
Paper 2
Structured and extended-response questions testing depth of understanding.
Total exam time varies by board and tier — typically 2.5 to 3.5 hours.
Grading: See the official board specification for the current grading scale.

Mini practice paper: 8 questions

Mixed-difficulty questions from across the US Biology syllabus. Tap "Show answer" after each to check yourself.

Q1 · Difficulty 1/3

What is the difference between a community and a population?

  1. They are the same thing
  2. A population is one species in an area; a community is all species in an area
  3. A community is one species
  4. A population includes non-living things
Show answer & explanation
✓ Answer: B — A population is one species in an area; a community is all species in an area
A population is all individuals of ONE species in an area. A community is all populations of DIFFERENT species interacting in that area.
Q2 · Difficulty 1/3

What is a food web?

  1. A network of interconnected food chains showing energy flow in an ecosystem
  2. A type of organism
  3. A diagram of a cell
  4. A single food chain
Show answer & explanation
✓ Answer: A — A network of interconnected food chains showing energy flow in an ecosystem
A food web shows the complex feeding relationships in an ecosystem, with multiple interconnected food chains. Energy flows from producers to primary to secondary consumers.
Q3 · Difficulty 1/3

What is biodiversity?

  1. The amount of water in an ecosystem
  2. The largest species in an area
  3. The variety of life in a particular habitat or ecosystem
  4. The number of plants only
Show answer & explanation
✓ Answer: C — The variety of life in a particular habitat or ecosystem
Biodiversity includes the variety of species, genetic diversity within species, and ecosystem diversity. High biodiversity generally means a more stable, resilient ecosystem.
Q4 · Difficulty 2/3

What is the 10% rule in ecology?

  1. 10% of species go extinct each year
  2. Ecosystems need 10% sunlight
  3. Only about 10% of energy is transferred from one trophic level to the next
  4. Only 10% of organisms survive
Show answer & explanation
✓ Answer: C — Only about 10% of energy is transferred from one trophic level to the next
At each trophic level, approximately 90% of energy is lost as heat through cellular respiration. Only about 10% is passed to the next level, limiting food chain length.
Q5 · Difficulty 2/3

What is ecological succession?

  1. The gradual process by which ecosystems change and develop over time
  2. Migration of animals
  3. A sudden natural disaster
  4. Extinction of all species
Show answer & explanation
✓ Answer: A — The gradual process by which ecosystems change and develop over time
Ecological succession is the process of change in a community over time. Primary succession starts on bare rock; secondary succession occurs after a disturbance (fire, flood) in an existing ecosystem.
Q6 · Difficulty 2/3

What is the nitrogen cycle?

  1. How organisms breathe nitrogen
  2. The process by which nitrogen is converted between its various chemical forms as it circulates through the atmosphere, soil, and organisms
  3. Nitrogen being produced by factories
  4. The decay of nitrogen compounds
Show answer & explanation
✓ Answer: B — The process by which nitrogen is converted between its various chemical forms as it circulates through the atmosphere, soil, and organisms
Nitrogen gas (N₂) is fixed by bacteria into usable forms (NH₃, NO₃⁻), absorbed by plants, passed through food chains, and returned to the atmosphere by denitrifying bacteria.
Q7 · Difficulty 1/3

What is an invasive species?

  1. A species that migrates seasonally
  2. Any predator
  3. Any endangered species
  4. A non-native species that causes ecological or economic harm in its new environment
Show answer & explanation
✓ Answer: D — A non-native species that causes ecological or economic harm in its new environment
Invasive species are introduced to new environments where they lack natural predators. They can outcompete native species, alter habitats, and cause ecological damage.
Q8 · Difficulty 2/3

What is the carbon cycle?

  1. Carbon being mined from the ground
  2. The life cycle of carbon-based organisms
  3. How organisms use carbon in food
  4. The biogeochemical cycle showing how carbon moves through the atmosphere, organisms, oceans, and earth
Show answer & explanation
✓ Answer: D — The biogeochemical cycle showing how carbon moves through the atmosphere, organisms, oceans, and earth
Carbon cycles through photosynthesis (absorbed), respiration (released), decomposition (released), combustion of fossil fuels (released), and ocean absorption.
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US Common Core Common Core US Biology FAQ

What does the US Common Core Common Core US Biology exam look like?
The US Common Core Common Core US Biology exam is structured across 2 components. Paper 1: Objective and short-answer questions covering the breadth of the specification. Paper 2: Structured and extended-response questions testing depth of understanding. Total exam time varies by board and tier — typically 2.5 to 3.5 hours.
Can I download a free US Common Core Common Core US Biology past paper?
Real US Common Core past papers are published directly by US Common Core on their official website. Kramizo doesn't redistribute copyrighted past papers, but we do generate free AI-written practice papers in the exact same style — same command words, same difficulty tier, same mark conventions. Use this practice paper as warm-up, then time yourself on official past papers before exam day.
How is US Common Core Common Core US Biology graded?
See the official board specification for the current grading scale. Kramizo's practice questions are tagged with difficulty 1-3 mapping roughly to the lower, middle, and top grade boundaries you'll encounter in the real exam.