Tag: internal structure of stem(dicot and monocot)

In monocot stem, the endodermis is absent. It has a single layer epidermis. The vascular bundles are scattered.

The vascular bundles of cucurbita are many, conjoint, bicollateral, regularly arranged forming a broken ring or scattered in ground tissue and are endarch.

A.Sunflower – Ground tissue is differentiated into hypodermis, general cortex and endodermis, pericycle, medulla and medullary rays.

B.Pisum - Ground tissue is differentiated into hypodermis, general cortex and endodermis, pericycle, medulla and medullary rays.

C.Maize – Ground tissue is undifferentiated.

D.Cucurbita - Ground tissue is differentiated into hypodermis, general cortex and endodermis, pericycle, medulla and medullary rays.

So, the correct option is ‘Maize’.

Secondary growth does not take place in monocotyledons, because of the absence of cambium between xylem and phloem in vascular bundles. These vascular bundles are called closed vascular bundles.

So, the correct option is ‘Closed’.

In monocot stem, cambium is absent in the vascular bundles. Due to this, grafting is not possible in monocot stem

So, the correct answer is ‘Lack cambium’

A.Monocot stem - conjoint, closed vascular bundles are present, in which phloem parenchyma is absent in the phloem.

The anatomy of monocot stem shows outer single layered epidermis with cuticle and stomata, sclerenchymatous hypodermis, large, wide parenchymatous ground tissue. In this vascular bundles are scatteredly arranged. So the stele is called Atactostele. Vascular bundles are outerly surrounded by sclerenchymatous fibres. So they are called fibrovascular bundles and are collateral, conjoint, closed with endarch xylem. Protoxylem lacuna is present. General cortex, endodermis, pericycle, medulla and medullary rays are absent.

So, the correct option is ‘Starch sheath’.

The stele is the central part of the root and stem which contains tissues derived from the procambium, in monocots, the vascular bundles are scattered and the stele is an atactostele.

The Y-shaped arrangement of xylem vessels is found in monocot stem, two metaxylem vessels are located at the upper two arms, while the base or the stick of the letter consists of one or two protoxylem vessels.