Vascular bundles are conjoint, collateral, endarch and lack cambium between xylem and phloem in all, but not in
Maize
Barley
Wheat
Sunflower
In which of the following, there is no differentiation of bark, sap wood and heart wood
Specialised epidermal cells surrounding the guard cells are called
Dermal tissue is derived from
Palisade tissue is present on both sides of leaf of
Deciduous plants shed their leaves during hot summer or in autumn. This process of shedding of leaves is called abscission. Apart from physiological changes, what anatomical mechanism is involved in the abscission of leaves ?