Question

describe the different describe the different regions seen in a transverse section of a dicotyledonous stem viewed under the microscope .​

Answer 1

Required Answer:-

The internal structure (transverse section) of a dicot stem are as follows:

Epidermis:

• As the name says, it is the outermost covering of the stem which helps in protection.
• It lacks chloroplasts except the guard cells of stomata.
• A thin cuticle is also present to prevent excess loss of water in transpiration.
• Stomata and trichomes are often seen.

Cortex:

• It is the next inner layer to epidermis.
• It is of three parts: Hypodermis, the general cortex layer and finally the endodermis.
• Hypodermis is composed of collenchyma.

Pericycle:

• It is multilayered and found below the cortex.
• It is made up of parenchyma and sclerenchyma.

Vascular bundles:

• They help in transportation of various susbtances across the plant body.
• They are conjoint, collateral and open type.
• The xylem is endarch.

Pith:

• Made up of parnechyma.
• From the vascular bundles to the centre.
• Sometimes if pith is arranged between the vascular bundles, they are called medullary rays$.$