Lesson 2

Practical part

Observe the experiments conducted in the previous lesson and write the results on the Worksheet.

Experiment No.1

Step 4. In a day, check the vessels and answer the questions:

What changes are observed in a glass of lime-water?

When drawing conclusions, is it possible to assert that plants emit carbon dioxide when they breathe?

Experiment No.2

Step 3. After a day, put a lit candle into each vessel.

What happened when the candle was dropped into the vessel?

What conclusion can be drawn from this experience?


In this practical work, students studied the mechanism of the respiratory process in plants.