These are bounded opportunities, not learner attainment. Partial and blocked source requirements remain so.

• partial: Support an argument that plants get the materials they need for growth chiefly from air and water, not from the soil

  Bounded objective: Use evidence to question the idea that plant mass comes mainly from soil. Synthetic mass argument, not a completed investigation or direct proof of each mass source; real experiment and measurement design remain conditional.

• partial: Explain that plants take in carbon dioxide from air and water from soil to make food (photosynthesis)

  Carbon dioxide/water inputs explained using supplied model.

• partial: Argue that most of a plant's mass comes from air (CO₂) and water, not soil minerals

  Plant gain exceeds soil loss; air/water explanation not directly quantified.

• partial: Describe a simple investigation showing soil mass barely changes while a plant grows significantly

  Fictional mass investigation interpreted, not designed/performed with real controls.

• partial: If {{name}} knows plants need water and sunlight, can they also explain that most of a plant's 'building material' actually comes from air and water rather than dirt?

  Try offers new-data-calculation-and-argument for the bounded objective; it does not establish every part of the source assessment. Synthetic mass argument, not a completed investigation or direct proof of each mass source; real experiment and measurement design remain conditional.

• Synthetic mass argument, not a completed investigation or direct proof of each mass source; real experiment and measurement design remain conditional.