Ninth grade Science Practice
Ninth grade science (Biology) explores cell biology, genetics, evolution, and ecosystem dynamics.
16 skills · 128 questions · No signup required to try
Adaptive difficulty
Questions get harder as your child improves and ease back when they struggle.
Mastery tracking
See real progress across every ninth grade Science skill.
Motivating
Streaks, points, badges, and games keep kids coming back.
Ninth grade Science topics covered
Cell biology
- Construct an explanation based on evidence for how the structure of DNA determines the structure of proteins
- Develop and use a model to illustrate the hierarchical organization of interacting systems
- Use a model to illustrate that cellular respiration is a chemical process
- Develop and use a model to illustrate the role of photosynthesis in cycling matter
Genetics
- Ask questions to clarify relationships about the role of DNA in protein synthesis
- Apply concepts of statistics and probability to explain the variation and distribution of expressed traits
- Evaluate the evidence supporting claims that changes in environmental conditions may result in natural selection
- Evaluate the claims, evidence, and reasoning for the classification of organisms
Evolution
- Communicate scientific information that common ancestry and biological evolution are supported by multiple lines of empirical evidence
- Construct an explanation based on evidence for how natural selection leads to adaptation of populations
- Apply concepts of statistics and probability to support explanations about natural selection
- Evaluate the evidence supporting claims that changes in environmental conditions may result in natural selection
Ecosystems
- Use mathematical and/or computational representations of phenomena or design solutions to support and revise explanations
- Construct and revise an explanation based on evidence for the cycling of matter and flow of energy through ecosystems
- Design, evaluate, and refine a solution for reducing human impact on the environment
- Evaluate evidence for the role of group behavior on individual and species' chances to survive
Frequently asked questions
Is Ninth grade Science practice free?+
Yes — try several questions per grade free, no signup needed. A free account unlocks unlimited adaptive practice and saved progress.
How does ZeLarn adapt to my child's level?+
After each answer, ZeLarn adjusts the difficulty — promoting to harder questions after a correct streak and easing back when your child struggles — so practice always stays at the right challenge.
Is ZeLarn a good IXL alternative for ninth grade Science?+
ZeLarn offers adaptive practice, mastery tracking, and gamification (streaks, badges, games) as a free, engaging alternative for ninth grade students.