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Cellular Energy Cycling

A comprehensive lesson on cellular respiration, photosynthesis, and matter conservation. Includes an assessment with NYS-aligned items and a complete teacher answer key with scoring guidance.

JEJeffrey Elterman

Cellular Energy Cycling

A comprehensive lesson on cellular respiration, photosynthesis, and matter conservation. Includes an assessment with NYS-aligned items and a complete teacher answer key with scoring guidance.

JEJeffrey Elterman

Standards: NYS MS-LS1-6 & MS-LS2-3 • Reaction: 6CO2 + 6H2O → C6H12O6 + 6O2

Total Part 2 5 Points

5 Question 5 Key (1 Pt) June 2019, Q32

CORRECT: (C) Photosynthesis

Rationale: Plant chloroplasts absorb sunlight to synthesize glucose sugar from carbon dioxide and water molecules.

6 Question 6 Key (1 Pt) June 2016, Q39

CORRECT: (A) Products of photosynthesis = reactants of respiration

Rationale: Photosynthesis produces glucose and oxygen, which respiration consumes to yield CO2 and water.

7 Question 7 Worked Walkthrough (1 Point) NYS ILS June 2022, Q48

ElementInputs (6CO2 + 6H2O)Outputs (C6H12O6 + 6O2)Equal?
Carbon (C)6 atoms (from 6CO2)6 atoms (from C6H12O6)6 = 6 ✓
Hydrogen (H)12 atoms (from 6H2O: 6×2=12)12 atoms (from C6H12O6)12 = 12 ✓
Oxygen (O)18 atoms (12 from 6CO2 + 6 from 6H2O)18 atoms (6 from glucose + 12 from 6O2)18 = 18 ✓

8 Question 8 Model Response & 2-Point NYSED Rubric (2 Points) NYS ILS June 2021, Q64–65

Exemplar Full-Credit Response (2 Points):

"The outputs of photosynthesis are glucose (C6H12O6) and oxygen (O2), which are the exact inputs required for cellular respiration. Plants produce these molecules, which organisms use to release ATP energy through respiration, returning CO2 and H2O back to the environment. This continuously cycles carbon, hydrogen, and oxygen atoms without any loss of matter."

ScoreCriteria (NYS Intermediate-Level Science Constructed Response Guidelines)
2 PointsStates outputs of photosynthesis are inputs of cellular respiration AND clearly explains how atoms cycle between organisms.
1 PointIdentifies glucose/oxygen but does not fully explain cycling, OR describes cycling generally without naming molecules.
0 PointsIncorrect, incomplete, or contains fundamental misconception.

Total Exam Score: 10 Points (100%) Scale: 9–10 = Level 4 • 7–8 = Level 3 • 5–6 = Level 2 • 0–4 = Level 1

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