GRADE 7 SCIENCE · CHAPTER 3
Living things & ecosystems
Study each lesson in order, or choose the idea you need today.
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Cells
Match cell structures with functions
Use supplied cell-structure descriptions to identify functions without assuming all cells contain every structure.
Cells
Compare photosynthesis and cellular respiration
Use simplified overall models to compare matter inputs and outputs of photosynthesis and aerobic respiration.
Ecosystems
Classify relationships between organisms
Classify interactions from the stated effects on each organism, without assuming every relationship fits one simple label.
AN EXAMPLE FROM THIS CHAPTER
A cell membrane controls movement of substances into and out of a cell. Which structure regulates this exchange?
Show answer & explanation
Cell membrane
The supplied description assigns exchange control to the cell membrane.
Curriculum & source notes
These are original Little Play study books organized around U.S. school topics. The official curriculum references below guide topic scope and progression. Coverage is selected, not a complete curriculum or a verified match to every state standard. They are not copies of a publisher’s textbook. Check your school’s syllabus and book edition.
High-school courses can be taken in different years. Choose the topic that matches the student’s current course.
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