Grade 3 · Science · Challenge
Free Life Science & Ecosystems worksheet - version 18
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-1SMQ21Q-1CID
1.Explain “natural selection” in your own words.
2.Explain “homeostasis” in your own words.
3.Explain “pollination” in your own words.
4.Explain “photosynthesis” in your own words.
5.Explain “cellular respiration” in your own words.
6.Explain “inherited trait” in your own words.
7.Explain “symbiosis” in your own words.
8.Explain “biodiversity” 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 18
- Explain “natural selection” in your own words.the process in which helpful inherited traits become more common
- Explain “homeostasis” in your own words.maintenance of stable internal conditions
- Explain “pollination” in your own words.the transfer of pollen that helps plants reproduce
- Explain “photosynthesis” in your own words.the process plants use to make sugar from light, water, and carbon dioxide
- Explain “cellular respiration” in your own words.the process cells use to release energy from food
- Explain “inherited trait” in your own words.a characteristic passed from parents to offspring
- Explain “symbiosis” in your own words.a close relationship between different species
- Explain “biodiversity” in your own words.the variety of living things in an area
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.