Printable Who Photosynthesizes Worksheet | Grade 9 Biology
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This Grade 9 Biology worksheet teaches students to find and correct the claim that only plants photosynthesize. Across 8 tasks, learners diagnose flawed explanations, use data from sealed jars, BTB tubes, and algae bottles, and rewrite each claim with accurate matter and energy language.
At a Glance
- Grade: 9 · Subject: Biology
- Standard: Not specified in source — students diagnose flawed claims and correct them using data
- Skill Focus: Correcting plants-only photosynthesis claims with matter and energy evidence
- Format: 5 pages · 8 problems · Answer key included · PDF
- Best For: Misconception repair during photosynthesis unit
- Time: 40–50 minutes
What's Inside
The 5-page worksheet opens with a reference box comparing photosynthesis and cellular respiration, then a worked Model Repair showing flaw, diagnosis, and corrected claim. Eight numbered tasks follow, each a flawed explanation with data, including a BTB color table and a gross photosynthesis calculation. A 3-page answer key is included.
Skill Progression
- Guided practice: One worked Model Repair demonstrates how to diagnose and rewrite a flawed claim.
- Supported practice: Part A, 4 tasks on who photosynthesizes and who respires, using the reference box and data.
- Independent practice: Part B, 4 tasks separating matter cycling from energy flow, with calculations in the workspace.
This sequence follows gradual release: I Do, We Do, You Do.
Standards Alignment
No standard code was supplied for this worksheet, so none is listed. The content addresses how matter cycles and energy flows through photosynthesis and cellular respiration, and how evidence supports explanations of these processes. Teachers can map the skill to their own state or district standards in lesson plans, IEP goals, or curriculum mapping tools.
How to Use It
- After direct instruction: Assign Parts A and B as a misconception check once students have seen both equations.
- Before a unit test: Use it as review in pairs, with students defending each diagnosis aloud.
While students work, watch whether they name the specific error or only write a new sentence. Expect 40–50 minutes.
Who It's For
Designed for Grade 9 Biology students who still hold ideas such as plants do not respire or respiration means breathing. The reference box and Model Repair support students who need scaffolds, while the calculation tasks challenge stronger students. Pair it with a lesson on the two equations or a light-and-dark BTB demonstration.
Correcting plants-only photosynthesis claims helps Grade 9 Biology students separate two processes that cells often run together. In this 8-task worksheet, learners diagnose flawed explanations about algae, sealed jars, BTB indicator tubes, terrariums, and seedling mass, then rewrite each claim using accurate evidence. The central ideas are that photosynthesis occurs in plants, algae, and some bacteria, that cellular respiration occurs in nearly all organisms including plants, and that matter cycles while energy flows through living systems. No standard code is listed for this resource. The structure follows the gradual-release model described by Fisher & Frey (2014): a worked model repair, supported diagnosis with a reference box, and independent data analysis with calculations, including gross photosynthesis from light and dark bottle oxygen changes. Because every flawed claim is paired with data, students practice evidence-based correction rather than recall. A 3-page answer key supports quick, accurate feedback.
