The most primitive type of stele is

Laticifers are found in ..........

When the 'intrafascicular cambium' is present within the vascular bundle,the vascular bundle is called ........

What is observed during the formation of vascular bundles in plants?

Nucleus is absent in

$A$ student observed grass and $Hibiscus$ plants in his garden during noon. To his surprise,only the leaves of grass were found rolled inwards. The reason could be