Vascular bundles in the stem of $Cucurbita$ or $Lagenaria$ are

Generally,the hypodermis in monocots is composed of:

In monocot stem,which of the following is absent?

In a cross-section of a plant organ, the vascular bundles are found to be conjoint, collateral, endarch, and scattered in the ground tissue. Which organ is this?

$A$ student observed the $T.S.$ of a plant organ slide under a microscope. He observed the vascular bundles in the stelar region as conjoint,collateral,and open. Based on these features of the vascular bundle,identify the correct option from below.

$A$: Endodermis is present between the general cortex and pericycle in maize stem. $R$: Eustele is present in maize stem.