Photo gallery showing the science Practical Skills of the Academic year 2020-21
Due to covid-19 the year 2020-21 has introduced online class for the students. Online class has its own merits and demerits but the major problem is student-teacher interaction which could not be met. When government allowed the offline classes for 8th 9th and 10th standard it was a mixed feeling of happiness and fear for all. Once the student entered the school by following all the safety measures, they were really happy to come to school. The students always enjoy learning by performing activities.During this crucial period also they were so positive towards study and that too when it is about performing activities. This precious moments of happiness I wanted to capture and preserve. And this is my small effort to do it with the help of this blog for all my loving students.
The photos uploaded here is not only a photo but each photo has its own story and memories. Come let's have a tour of it.
9th Std-Practical showing slide of onion peel
1st.STEP: Take a onion and cut it into 4 pieces with the help of a dissection knife.Now Take a piece of onion and bend it to remove the peel called epidermal peel with the help of forceps from its inner side
2nd. STEP: Place the peel in water in a watch glass .
3rd STEP:Cut the peel into smaller pieces.
5th STEP: Add a few drops of safranin stain to the piece of peel for staining . Now, add few drops of water to remove excess stain. Remove the extra water from the surrounding peel by using a blotting paper.
4th STEP: Transfer the piece of peel to a clean slide with the help of brush.
6th STEP: Now , add a drop of glycerine over the piece of peel and place the cover slip with the help of a needle carefully to avoid entry of air bubbles. Soak the extra glycerine with the blotting paper.
7 th STEP: Examine the slide under the microscope.
Observations:
* A large no of rectangular cells with distinct cell wall is observed.
* A big central vacuole is present in the cell.
* Cytoplasm is seen on inner surface of cell wall
* Nucleus is seen in each cell of the epidermal peel of onion.
PRECAUTIONS
*Always take a clean slide and hold it by its edges.
*Proper staining should be done.
*Transfer the peel always with the help of brush.
*Mount the peel in the centre of the slide.
*Avoid entry of air bubbles.
* Remove extra stain , water and glycerine with the help of blotting paper.
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