Activity 5.6 Class9 Science The Fundamental Unit of Life
Activity 5.6 Class 9 Science belongs to Chapter 5 The
Fundamental Unit of Life Class 9 Science. You will get a complete
solution with an explanation and conclusion. After reading activity 5.6, you
will be able to answer the questions based on the activity.
Activity 5.6 Class 9 Science Chapter 5
You are suggested to study NCERT activity 5.6 class 9 science chapter 5
explanation with a conclusion so that you can attempt questions based on activity 5.6 class 9 science.
Activity 5.6 Class 9 Science
· Mount the peel of a Rheo leaf in
water on a slide and examine cells under the high power of a microscope. Note the
small green granules called chloroplasts. They contain a green substance called
chlorophyll. Put a strong solution of sugar or salt on the mounted leaf on the
slide. Wait for a minute and observe under a microscope. What do we see?
· Now place some Rheo leaves in
boiling water for a few minutes. This kills the cells. Then mount one leaf on a
slide and observe it under a microscope. Put a strong solution of sugar of salt
on the mounted leaf on the slide. Wait for a minute and observe it again. What do
we find? Did plasmolysis occur now?
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| Plasmolysis |
Observation Activity 5.6 Class 9 Science
a.
Under the microscope, we see green granules called
chloroplast which contain chlorophyll. These chlorophylls perform photosynthesis.
when a strong solution of sugar or salt is on the slide. The cell organelles with
plasma membrane shrink.
b.
Boiled leaf peel does not lose or absorb water.
Explanation Activity 5.6 Class 9 Science
When a strong solution of sugar or salt is poured on the living cells, the water
of cells comes out of the cell and cell organelles along with plasma membrane have
come to lie on the side of the cell wall and due to this cells become
plasmolyzed.
When a strong solution of sugar or salt is poured on the dead leaf cells, no
osmosis occurs so cells do not become plasmolyzed.
Plasmolysis – if a plant cell is
placed in a strong sugar or salt solution, which is having a concentration higher
than cell sap, then water from the cell sap flows out due to exosmosis. This causes
contraction of the protoplasm and it accumulates in a spherical shape. this
condition is known as Plasmolysis.
Conclusion Activity 5.6 Class 9 Science
This activity shows that living cells show osmosis whereas dead cells don’t.
Related Topics
1. Activity 5.7 Class 9 Science
2. Activity 5.5 Class 9 Science
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