Question

A student conducted an experiment to show that carbon dioxide is released during respiration. State two precautions that the student must take for obtaining correct observations.

Answer 1

Answer:

He should usegoofd quality lime water test.

Container must be air tight.

Organism ortheir parts must be live.

Answer 2

KOH Absorbs $CO_2$

Explanation:

• Precautions:

1. First of all the conical flask should be kept airtight.

2. In order for the seed does not touch the glass tube, it should be fixed properly.

3. A fresh solution of Potassium hydroxide (KOH) should be made use of because KOH helps in the absorption of carbon dioxide by creating a partial vacuum in the conical flask thereby helping the water level to rise and giving the student correct observations.