if your teacher asked you to select the slide showing parenchyma cells from a slide box containing a few unlabelled slides write two characteristics on the basis of which you will identify the slide.
Answers
Explanation:
- oval or rounded
- walled structure
AIM
To identify parenchyma and sclerenchyma tissues in plants, from prepared slides and to draw their labelled diagrams.
MATERIALS REQUIRED
Prepared slides of parenchyma, collenchyma and sclerenchyma, compound microscope.
THEORY
A group of cells that are similar in structure and work together to achieve a particular function forms a tissue.
PROCEDURE
Observe the prepared slides of all the plant tissues one by one.
First focus the slide at low power and then observe it at high power.
Study the characters and draw the diagrams in your notebook.
OBSERVATIONS
IDENTIFYING FEATURES
I. Parenchyma
1)Cells of Parenchyma tissue are isodiametric.
2)Intercellular spaces are present in between the cells.
3)Parenchymatous cells possess large central vacuole and peripheral cytoplasm with a nucleus.
4)These are generally present in the soft parts of plants like leaves, roots, flowers, etc.
5)The important functions of parenchymatous cells are storage, photosynthesis, etc.
Observe the prepared slides of all the plant tissues one by one.
First focus the slide at low power and then observe it at high power.
Study the characters and draw the diagrams in your notebook.
OBSERVATIONS
IDENTIFYING FEATURES
I. Parenchyma
1)Cells of Parenchyma tissue are isodiametric.
2)Intercellular spaces are present in between the cells.
3)Parenchymatous cells possess large central vacuole and peripheral cytoplasm with a nucleus.
4)These are generally present in the soft parts of plants like leaves, roots, flowers, etc.
5)The important functions of parenchymatous cells are storage, photosynthesis, etc.
II. CoIIenchyma
1)Collenchymatous cells are somewhat oval to elongated.
2)Each cell possesses large central vacuole and peripheral cytoplasm with prominent nucleus.
3)Thickenings are present at corners of cells. Thickening comprise of cellulose and pectin.
4)Intercellular spaces are absent.
5)Collenchymatous cells are commonly present below the epidermis in petiole, leaves and stems. Its
main function is to provide mechanical strength.
III. Sclerenchyma
1)Cells of sclerenchyma tissue are dead with highly thickened walls.
2)Thickenings consist of lignin.
3)There are two types of sclerenchyma cells:
fibres which are elongated cells with tapering ends and
sclereids (also called stone cells), which are roughly isodiametric cells with narrow cavities.
4)Sclerenchymatous cells have pits which act as connections with adjacent cells.
5)The main function of sclerenchyma is to provide support and mechanical strength to the plant.