In a stem which is covered by periderm and in which stomata are absent, gaseous exchange takes place through

Intrafascicular cambium is present in between the

In a plant organ which is covered by periderm and in which the stomata are absent, some gaseous exchange still takes place through

$I.$ Protection of internal tissues

$II.$ Protection of leaves from microbes

$III.$ Gaseous exchange

$IV.$ Reduction in the rate of transpiration through epidermal cells due to trichomes

Which of the function of epidermis is/are relevant from the above given statements?

Vascular cambium of dicot root is purely secondary in origin and arise from

Bark refers to all tissues exterior to the