Grade 3 · Science · Challenge
Free Life Science & Ecosystems worksheet - version 19
Grade 3 life science & ecosystems practice with original, difficulty-matched questions. This printable version includes 8 grade-appropriate questions and a separate answer sheet.
Life Science & Ecosystems
Grade 3 · Stretch challenge · 8 questions · Version PG-1SWPNQP-1CID
1.Explain “cellular respiration” in your own words.
2.Explain “food web” in your own words.
3.Explain “carrying capacity” in your own words.
4.Explain “inherited trait” in your own words.
5.Explain “biodiversity” in your own words.
6.Explain “natural selection” in your own words.
7.Explain “symbiosis” in your own words.
8.Explain “photosynthesis” in your own words.
Answers and teaching notes
Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.
Show answers for version 19
- Explain “cellular respiration” in your own words.the process cells use to release energy from food
- Explain “food web” in your own words.connected food chains in an ecosystem
- Explain “carrying capacity” in your own words.the largest population an environment can support
- Explain “inherited trait” in your own words.a characteristic passed from parents to offspring
- Explain “biodiversity” in your own words.the variety of living things in an area
- Explain “natural selection” in your own words.the process in which helpful inherited traits become more common
- Explain “symbiosis” in your own words.a close relationship between different species
- Explain “photosynthesis” in your own words.the process plants use to make sugar from light, water, and carbon dioxide
Worked example
Connect structures and behaviors to survival, growth, reproduction, and energy flow.
Common mistake
Describing a trait without explaining its function.
Helpful hint
Ask how the feature affects survival or reproduction.