Photosynthesis Virtual Lab
Compare photosynthesis in aquatic and land plants. Investigate light, carbon dioxide, temperature and light distance using two different experimental models.
in the presence of light energy
Select Aquatic Plant or Land Plant, choose the conditions, then press Run Experiment.
🎯 Aim
To investigate factors affecting photosynthesis and compare how photosynthetic activity can be demonstrated using aquatic and land plants.
🧰 Virtual Apparatus
Aquatic plant, beaker, funnel, inverted collection tube, land plant, lamp, distance scale, temperature controls, carbon dioxide controls and virtual starch-test indicator.
📘 Theory
Photosynthesis converts light energy into chemical energy. Plants use carbon dioxide and water to synthesize carbohydrates, with oxygen released during oxygenic photosynthesis.
🌊 Aquatic Plant vs 🌱 Land Plant
🌊 Aquatic Plant Experiment
A submerged photosynthetic plant can release visible oxygen bubbles. A funnel and inverted tube can be used as a simplified model for collecting the gas.
Main observation: oxygen production.
Useful variables: lamp distance, light intensity, temperature and dissolved carbon dioxide availability.
🌱 Land Plant Experiment
Photosynthesis in a land plant can be investigated through gas exchange and through starch formation in illuminated leaves.
Main observation: photosynthetic activity in leaves.
Useful variables: light, carbon dioxide, temperature and illuminated versus dark conditions.
📋 Observation Table
| Trial | Plant | Light | Distance | CO₂ | Temperature | Condition | Relative Rate | Observation |
|---|---|---|---|---|---|---|---|---|
| Run an experiment and press Record. | ||||||||
📝 Procedure
- Select Aquatic Plant.
- Set light intensity to Medium and distance to 20 cm.
- Set CO₂ to Medium and temperature to 25°C.
- Press Run Experiment.
- Observe oxygen bubbles and gas collection.
- Change the lamp distance and compare the rate.
- Record the observations.
- Now select Land Plant.
- Run the experiment under light conditions.
- Observe CO₂ entry and O₂ release indicators.
- Press Test Result to model a starch test.
- Repeat under Dark conditions and compare.
🧠 Prediction Challenge
🎓 Quick Viva
1. Why are aquatic plants useful for photosynthesis experiments?
Oxygen produced underwater can form visible bubbles, making photosynthetic activity easier to observe.
2. What gas is collected in the aquatic plant setup?
The gas associated with photosynthetic oxygen production is oxygen. A real experiment should confirm gas identity using an appropriate test.
3. What happens when the lamp is moved farther away?
The light reaching the plant generally decreases, which can reduce photosynthesis when light is the limiting factor.
4. How can photosynthesis be demonstrated in a land-plant leaf?
After appropriate experimental preparation, starch formation in an illuminated leaf can be investigated using an iodine test.
5. Why is a leaf destarched before a classic starch experiment?
Destarching reduces previously stored starch so that starch detected after the treatment can be linked more clearly to photosynthesis during the experiment.
6. What happens to photosynthesis in darkness?
Photosynthetic carbon fixation dependent on the light reactions cannot continue normally without light, while cellular respiration can continue.
7. Why does increasing CO₂ not increase photosynthesis forever?
Another factor such as light intensity, temperature or biochemical capacity eventually becomes limiting.
✅ Result
Both aquatic and land plants perform photosynthesis. Aquatic plant experiments can demonstrate oxygen production through bubbles or gas collection, while land-plant experiments can investigate leaf gas exchange and starch formation. Light intensity, carbon dioxide availability and temperature can all influence the photosynthetic rate.