The transverse section of a plant material shows the following anatomical features – (a) the vascular bundles are conjoint, scattered and surrounded by a sclerenchymatous bundle sheath, (b) phloem parenchyma is absent. What will you identify it as?

HARITHA,Subject Matter Expert at Edumarz

Solution:The correct identification is monocotyledonous stem

Features of monocot stem

• It is circular in shape

• It do not show secondary growth due to absence of cambium

• Tissues are not arranged uniformly

• Epidermis contains thin walled cells

• Trichomes are absent

• Pericycle is not multilayered

• Vascular bundles are conjoint and numerous

• Pith region is reduced and not differentiated

• Absence of phloem parenchyma

• Hypodermis is formed of sclerenchyma cells

• Outer region of vascular bundle of monocot stem contain bundle sheath formed of sclerenchyma cells

• Absence of secondary growth

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 Features of dicot stem

• Ground tissue is formed of endodermis,pericycle,cortex,pericycle and pith

• Hypodermis is formed of collenchyma cells

• Presence of phloem parenchyma

• Pith is well developed in dicot stem

• Vascular bundles are open and found in less numbers

• Old vascular bundles are replaced by newly formed ones

• Absence of bundle sheath on outer portion of vascular bundles

• Presence of trichomes