Activity 8.4 Class 8 Science Chapter 8 Solution

 Activity 8.4 Class 8 Science Cell- Structure and Functions

In this post, you will find NCERT Science Class 8 Chapter 8 Cell- Structure and Functions Activity solutions. 

 

You are suggested to study NCERT activity 8.4 class 8 science explanation with a conclusion so that you can attempt questions based on activity 8.4 class 8 science.

Activity 8.4 Class 8 Science

 

    ·     Take a clean toothpick or a matchstick with the tip broken.

    ·     Scrape the inside of your cheek without hurting it.

    ·     Place it in a drop of water on a glass slide.

    ·     Add a drop of iodine and place a coverslip over it.

    ·     Alternatively, add 1-2 drops of methylene blue solution.

    ·     Observe it under the microscope.

    ·     You may notice several cells in the scraped Material.

    ·     You can identify the cell membrane, the cytoplasm, and the nucleus.

    ·     A cell wall is absent in animal cells.

·     

 

Observation and explanation 

The human cheek epithelial cells are irregular in shape and are surrounded by a thin cell membrane.

Each cell has a nucleus and other cell organelles like mitochondria, Golgi bodies, ribosomes, etc.

A jelly-like substance present between the nucleus and cell membrane is cytoplasm.

The cell wall is absent in these cells. The cell wall is present in plant cells only as you read in activity 8.3. 

Conclusion 

This activity shows the basic structure of human cheek cells.

 Related Topics 

1. Activity 8.3

2. Activity 8.2