VIRTUAL BIOLOGY LAB · LAB 07

🍃 Stomata and Leaf Impressions

Identify stomata and understand their role in gas exchange and transpiration.

CBSE Classes 9–10Interactive practicalDrag & drop challengeStudent notebook

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🔎 Learning objective

Identify stomata and understand their role in gas exchange and transpiration.

3Hands-on matches

1Knowledge check

🧬 Interactive laboratory workspace

Explore the biological idea using the model controls. This is a conceptual classroom simulation.

🍃

Stomata and Leaf Impressions

Guard cells regulate the stomatal pore. Stomata allow carbon dioxide entry and water vapour loss.

PRACTICAL WORKBENCH · EXPERIMENT 07

🧪 Microscope slide station: Make and inspect a leaf impression

Stomatal density varies with leaf surface and species; count several fields for a reliable estimate.

Ready to begin

APPARATUS & EXPERIMENT CONTROLS

01 · Set up apparatus02 · Adjust variables03 · Run trial04 · Record reading

Nail-polish layer Leaf surface Objective lens

◉Stomatal count▤

OBSERVATION & MEASUREMENTS

Nail-polish layer—

Leaf surface—

Objective lens—

Stomata per field—Awaiting run

Stomatal density varies with leaf surface and species; count several fields for a reliable estimate.

Scientific interpretation will appear after the trial.

Scientific note: Choose the leaf surface, prepare a thin impression and count stomata in the viewing field.

Model conditionObservation focus

Model ready. Choose a condition and run the model to see an observation.

🧪 Hands-on drag & drop challenge

PRACTICAL SKILL BUILDER

Drag each item from the tray to its correct destination. On a phone or tablet, tap an item and then tap its destination. Complete all three matches to finish.

🧰 MATERIALS & CONCEPTS

🎯 DROP ZONES

Choose an item and place it in the matching zone.

📓 Observation notebook

Record your observation and export it for revision.

Key concept: Guard cells regulate the stomatal pore. Stomata allow carbon dioxide entry and water vapour loss.

🎯 Quick knowledge check

Which cells regulate stomatal opening?

Select one answer to check your understanding.

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