Photosynthesis & Carbon

Unit: Cycles of Life: Water & Carbon

Lesson 5 of 10

Grade: 6th
Duration: 50 minutes
Class size: 20 students
Subject: Science

Common Core Alignment

Although the Common Core State Standards (CCSS) are primarily focused on English Language Arts and Math, the Next Generation Science Standards (NGSS), which many US states adopt or align with alongside Common Core, serve as the best framework for science lessons. This lesson integrates CCSS ELA standards to support scientific literacy and communication.

Relevant Standards:

Next Generation Science Standards (NGSS):

MS-LS1-6: Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.
MS-ESS2-3: Develop a model to describe the cycling of matter and flow of energy among living and nonliving parts of an ecosystem.

Common Core State Standards (CCSS) for ELA Literacy in Science and Technical Subjects:

CCSS.ELA-LITERACY.RST.6-8.3: Follow precisely a multistep procedure when carrying out experiments, taking measurements, or performing technical tasks.
CCSS.ELA-LITERACY.SL.6.4: Present claims and findings, sequencing ideas logically and using pertinent descriptions, facts, and details.
CCSS.ELA-LITERACY.WHST.6-8.2: Write informative/explanatory texts, including the narration of scientific processes.

Learning Objectives

By the end of this lesson, students will be able to:

Describe the process of photosynthesis and explain its role in capturing carbon dioxide. (NGSS MS-LS1-6)
Illustrate how carbon cycles through photosynthesis within ecosystems using a flowchart. (NGSS MS-ESS2-3)
Collaborate to synthesize scientific information and communicate it through speaking and writing. (CCSS.ELA.RST.6-8.3, SL.6.4, WHST.6-8.2)

Materials Needed

Large chart paper or whiteboards for group work
Markers or colored pencils
Student notebooks or science journals
Photosynthesis diagram handouts (simple labeled leaf cross-section and carbon cycle overview)
Timer or classroom clock
Exit ticket slips (small papers)

Lesson Activities and Timeline

1. Engage (5 minutes)

Begin with a quick question: “Where does the oxygen we breathe come from?”
Show a vibrant image of a forest or green plants and ask, "How do you think plants ‘eat’ or get their energy?"
Share an interesting fact: "Plants actually make their own food using sunlight — a process called photosynthesis, which also plays a huge role in how carbon travels through our environment."

2. Explore (15 minutes)

Group Activity: Divide students into 4 groups of 5.
Hand out labeled photosynthesis diagrams to each student.
Each group reads through the diagram and discusses the key parts: leaves, sunlight, carbon dioxide, water, glucose, and oxygen.
Challenge: Each group creates a simple visual flow showing how carbon moves into the plant and how oxygen is released. Provide chart paper and markers.
Teacher circulates, asking probing questions such as, “What happens to the carbon dioxide when it enters the leaf?” and “Why is sunlight important?”

3. Explain (10 minutes)

Regroup and invite each group to present their flowchart briefly (2-3 minutes each).
After presentations, teacher provides a clear, step-by-step overview of photosynthesis emphasizing:
- Plants take in carbon dioxide (CO2) from the air and water (H2O) from the soil.
- Using sunlight energy, they convert CO2 and water into glucose (a sugar species use for food) and release oxygen (O2).
- This glucose then stores carbon, which moves through ecosystems as animals consume plants.

4. Elaborate (15 minutes)

Carbon Cycle Flowchart Creation:
- Provide students with a blank flowchart template in their science journals.
- Together, create a class flowchart on the board showing how carbon cycles from the atmosphere into plants via photosynthesis, moves to animals, and eventually back into the atmosphere through respiration or decay.
- Students then complete their individual flowcharts, citing examples and labeling each step with simple descriptions.
- Encourage creative elements such as drawing arrows with carbon symbols or pictures of animals eating plants.

5. Evaluate (5 minutes)

Distribute exit tickets with two questions:
1. Explain in your own words why photosynthesis is important to the carbon cycle.
2. Draw a simple arrow that shows one way carbon moves in the ecosystem.
Collect exit tickets for assessment of understanding.

Differentiation & Extensions

For advanced learners: Challenge them to hypothesize what would happen if photosynthesis stopped in an ecosystem.
For learners who need support: Provide sentence starters for the exit ticket ("Photosynthesis is important because...") and allow drawing instead of writing if needed.
Extension: Assign a take-home task where students identify a local plant and research its role in the carbon cycle.

Teacher Reflection

Note students' ability to collaborate and explain photosynthesis and carbon cycling concepts clearly.
Review exit tickets to gauge understanding and plan remediation if necessary for upcoming lessons.

This lesson combines visual, auditory, and kinesthetic learning modes, fostering an engaging, student-centered environment while maintaining rigorous alignment to NGSS for science content and CCSS for literacy skills. It empowers students to explore and articulate critical ecosystem processes fundamental to understanding Earth's cycles.

Teaching Instructions