Activity 2.4 Class 8 Science Friends and Foe

 Activity 2.4 Class 8 Science Friends and Foe

In this post, you will find NCERT Science Class 8 Chapter 2 Friends and Foe Activity solutions.  Class 8 science chapter 2 consists of NCERT Activity 2.4 Class 8 Science Explanation with a conclusion.

NCERT Activity 2.4 Class 8 Science Explanation with a conclusion

You are suggested to study NCERT activity 2.4 class 8 science explanation with a conclusion so that you can attempt questions based on activity 2.4 class 8 science.

Activity 2.4 Class 8 Science

    ·     Take a 500mL beaker filled up to ¾ with water.

    ·     Dissolve 2-3 teaspoons of sugar in it.

    ·     Add half a spoon of yeast powder to the sugar solution.

    ·     Keep it covered in a warm place for 4-5 hours.

    ·     Now smell the solution.

    ·     Can you get a smell?

 

 Activity 2.4 Class 8 Science Friends and Foe

Observation activity 2.4 Class 8 Science

We get a foul smell. This smell is of alcohol.

 

Explanation activity 2.4 Class 8 Science

Sugar is used by yeast as food and is converted into alcohol by yeast.

The process of conversion of sugar into alcohol is known as fermentation.

This process happens in the absence of oxygen(anaerobic respiration)

Fermentation is used in our daily life in preparing bread, wine, beer, etc.

           Absence of oxygen
Glucose  ----------------→        Ethanol + CO₂ + Energy

                     Yeast 

Conclusion activity 2.4 Class 8 Science

This activity shows the process of fermentation.

 Related Topics

1. Activity 2.3 Class 8 Science

2. Activity 2.2 Class 8 Science