Investigate conditions for photosynthesis

Make a prediction and investigate

Record the starting conditions and output. Change one available environmental control, then repeat with the others held fixed.

Controls in the actual lab

• Light: starts at 50 ; available range 10–100 .
• CO₂: starts at 1 ; available range 0.2–2 .

A leaf needs light and CO₂ to make sugar. Dim the sun or starve the air and sugar slows.

Discuss the evidence

Identify the condition you changed, the response you measured, and whether another condition could limit the response.

Try it beyond the activity

Explain why increasing one input does not establish that the same increase will always produce the same response.

Record your thinking

Sources and limits

This companion uses the published Photosynthesis activity and its learning guidance. Review any original sources linked there. It is a discussion plan by Lesson Worlds, not a scored assessment, a standards certification, or evidence of learning gains.

Use this activity with a learner

Families and educators · choose by prior knowledge

Learning goal: A leaf needs light and CO₂ to make sugar. Dim the sun or starve the air and sugar slows.

Before you begin: Read the controls for Light, CO₂. Make one prediction before changing a setting.

Check understanding: Ask for one observation, the evidence that supports it, and a question to investigate next.

A simulation simplifies the real world. Explain which conditions stayed fixed; a successful run alone does not demonstrate mastery.

Activity and guide by Lesson Worlds. About the platform.