After teaching the chapter ‘Respiration in Organisms’ in Class VII, a teacher performs the following activity with her students. They take three test tubes and fill 3/4^th of each with water. The test tubes are labelled as A, B and C. They put a snail in test tube A, a water plant in test tube B and in C they keep snail and plant both. The teacher then asks the students which test tube would have the highest concentration of CO₂. Which process skill is the teacher emphasising in this case ?

The correct option is Predicting.

Explanation:

In the given activity, three test tubes (A, B, and C) are set up with different living components:
- Test tube A contains only a snail, which releases carbon dioxide (CO₂) through respiration.
- Test tube B contains only a water plant, which uses CO₂ for photosynthesis in the presence of light and releases oxygen (O₂).
- Test tube C contains both a snail and a water plant, where the CO₂ produced by the snail can be utilized by the plant for photosynthesis.

When the teacher asks the students to determine which test tube would have the highest concentration of CO₂ prior to testing or measuring, she is asking them to use their existing scientific knowledge to forecast an outcome.

Formulating an expectation or outcome about a future event or untried setup based on prior knowledge, evidence, and logical reasoning is the science process skill known as Predicting.