Science (EVS K-5) · Class 3

Active learning ideas

How Plants Make Their Food

Active learning helps young students grasp abstract concepts like photosynthesis by making them tangible. When children touch, observe, and experiment with plants, they connect scientific ideas to real experiences, building lasting understanding.

• CBSE Learning Outcomes
• NCERT: Class 7, Chapter 1: Nutrition in Plants

• 30–50 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Hot Seat
• 45 min · Small Groups

Experiment: Light and Dark Plants

Select two similar potted plants. Place one in sunlight and the other in a dark cupboard for five days. Have students observe and record daily changes in leaf colour and plant health, then compare results in groups.

What three things does a plant need to make its own food?

Facilitation Tip

During the Light and Dark Plants experiment, remind students to place both plants in the same location after the initial week to ensure only light exposure varies.

What to look for

Show students pictures of different plant parts (leaf, root, flower) and ask them to point to the part where photosynthesis primarily happens. Follow up by asking why that part is best suited for the job.

• Apply
• Analyze
• Evaluate
• Social Awareness
• Self-Awareness

Activity 02

• Hot Seat
• 30 min · Whole Class

Demonstration: Chlorophyll Extraction

Boil spinach leaves in water, then in alcohol over a hot plate. Students watch the green colour move to the alcohol and test it with iodine for starch. Discuss how chlorophyll helps make food.

Why do you think most leaves are green and grow facing the sunlight?

Facilitation Tip

When demonstrating chlorophyll extraction, use fresh spinach leaves to ensure a clear green pigment release for easy observation.

What to look for

Give each student a small card. Ask them to write down two things a plant needs to make food and one thing it produces. Collect these as they leave the classroom.

• Apply
• Analyze
• Evaluate
• Social Awareness
• Self-Awareness

Activity 03

• Hot Seat
• 40 min · Pairs

Model: Photosynthesis Jar

Fill a clear jar with water, add a plant sprig and baking soda for carbon dioxide. Seal and place in sun. Students note bubbles of oxygen after 30 minutes and draw the process.

What do you think would happen to a plant kept inside a dark cupboard for a week?

Facilitation Tip

For the Photosynthesis Jar model, encourage students to label each jar with the date and conditions to track changes over time.

What to look for

Pose the question: 'Imagine you have a plant that is not getting enough sunlight. What might happen to its leaves, and why?' Facilitate a class discussion, encouraging students to use the vocabulary learned.

• Apply
• Analyze
• Evaluate
• Social Awareness
• Self-Awareness

Activity 04

• Stations Rotation
• 50 min · Small Groups

Stations Rotation: Plant Needs

Set up stations for sunlight (torch on leaf models), water (wilting celery), air (balloon with plant). Groups rotate, predict outcomes, and test simple setups, recording evidence.

What three things does a plant need to make its own food?

Facilitation Tip

In Station Rotation: Plant Needs, place a magnifying glass at each station to help students closely observe root hairs and leaf structures.

What to look for

Show students pictures of different plant parts (leaf, root, flower) and ask them to point to the part where photosynthesis primarily happens. Follow up by asking why that part is best suited for the job.

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

A few notes on teaching this unit

Start with hands-on experiences before introducing terminology to prevent rote learning. Encourage students to ask questions and make predictions, then test them through experiments. Avoid explaining everything upfront; let evidence guide their understanding. Research shows that when students observe direct changes, like a plant wilting in darkness, they remember the concept of photosynthesis more clearly.

By the end of these activities, students should confidently explain how plants use sunlight, air, and water to make food. They should also identify leaves as the primary site of photosynthesis and recognise chlorophyll’s role in capturing light.

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Watch Out for These Misconceptions

• During the Light and Dark Plants experiment, watch for students who believe plants grow better in darkness because they do not see immediate wilting as a problem.

  During the Light and Dark Plants experiment, ask students to observe both plants daily and record changes in leaf colour and firmness, then guide them to conclude that wilting happens because no food is made without light.

• During the Chlorophyll Extraction demonstration, watch for students who think the green colour comes from paint or dirt on the leaves.

  During the Chlorophyll Extraction demonstration, have students compare the extracted green liquid to a drop of water and a drop of soil mixed with water to show that the colour is inside the leaf, not on its surface.

• During Station Rotation: Plant Needs, watch for students who believe leaves make food but do not understand why leaves are green.

  During Station Rotation: Plant Needs, ask students to examine leaf colour under a magnifying glass and connect it to the chlorophyll extraction activity, reinforcing that green colour helps leaves capture sunlight.

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Methods used in this brief

• Hot Seat
• Stations Rotation