CBSE Class 9 Practicals Science Identification of parenchyma, collenchyma and sclerenchyma tissues in plants, striped, smooth and cardiac muscle fibers and nerve cells in animals, from prepared slides. Draw their labeled diagrams. Students get here clear concept at this page.
Identification of parenchyma, collenchyma and sclerenchyma tissues in plants, striped, smooth and cardiac muscle fibers and nerve cells in animals, from prepared slides. Draw their labeled diagrams.
A) Identification of parenchyma, collenchyma and sclerenchyma tissues in plants and nerve cells in animals from prepared slides. Draw their labeled diagrams.
Aim: To identify parenchyma, collenchyma and sclerenchyma tissues in plants and nerve cells in animals.
Requirements: Prepared slides of parenchyma, collenchyma and sclerenchyma tissues, nerve cells and compound microscope.
Procedure:
1) Take the prepared slides of parenchyma, collenchyma and sclerenchyma tissues one by one.
2) Adjust the slide under compound microscope.
3) Initially adjust the slide on 10 X objective and then 45X objective,
4) Draw the diagram of your observation and label appropriately.
Observation:
a) For identification of parenchyma following characteristics were observed.
1) Presence of intra cellular spaces in parenchymal cells.
2) These parenchymal cells are roughly spherical.
3) They contain cytoplasm, vacuole and nucleus present in the center.
b) For identification of collenchyma following characteristics were observed.
1) As compared to parenchyma cells, collenchyma cells are oval and elongated in shape.
2) Absence of intracellular spaces in collenchyma cells.
3) They contain large vacuole, along with this, cytoplasm is also present.
4) At the center of the cell, nucleus can be clearly visible.
5) In these cells, thickening is present at the corners.
c) For identification of sclerenchyma following characteristics were observed.
1) Sclerenchyma tissues are dead.
2) They have thick walls.
3) These thick walls formed due to deposition of lignin.
4) In sclerenchyma tissues, pits are present. These pits separate the adjacent cells.
5) Fibers and sclerites are two types of parenchyma cells.
B) Aim: To identify striped, smooth and cardiac muscle fibers and nerve cells in animals, from prepared slides. Draw their labeled diagrams.
Requirements: Prepared slides of striped, smooth and cardiac muscle fibers and nerve cells in animals and compound microscope.
Procedure:
1) Take a prepared slide of striped, smooth, cardiac muscle fibers and nerve cells.
2) Observe the slide under compound microscope.
3) Adjust the slide first under 10X or low power objective.
4) Once you observe the structure on 10X objective, move it on 45 X objective.
Observation:
a) striped muscles:
1) Striped muscles are also called as striated muscle or skeletal muscles.
2) These cells are multinucleated.
3) As they are striated contains light and dark bands.
4) Striped muscles are voluntary muscles.
b) Smooth muscles:
1) These are non-striated that means dark and light bands are absent.
2) They contain a nucleus which is present at the center.
3) They are involuntary in action.
c) Cardiac muscle fibers
1) The cardiac muscles are uninucleate.
2) They are long and show branching.
3) They contain intercalated disc.
4) Light and dark bands are present.
5) Present in heart.
d) Nerve fibers:
1) Nerve cells are called as neurons. They contains single nucleus and in surrounding cytoplasm is present.
2) A long cytoplasmic projection arise from head called axon.
3) The head region of the neuron contains dendrites responsible for receiving information.
4) On the axon myeline sheath are present.
5) In myelin sheath gaps are present called as nodes of ranvier.
Result: parenchyma, collenchyma, sclerenchyma tissues and nerve cells were observed.
Conclusion: From the prepared slides of parenchyma, collenchyma, sclerenchyma tissues, nerve cells were successfully observed and identified.
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Thank you it helps me
I want something different from this topic but I managed.
I want to identify parenchyma collenchyma unstitched and cardiac muscle in animal using permanent slides and draw their diagrams
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