A structure is found in stems but not roots is
A) epidermis
B) vascular tissue
C) node
D) cortex

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A structure is found in stems but not roots is node (option C).

Explanation:

Nodes are the structures that allow the growth of branches, leaves and flowers from the stem structure. The nodes are usually part of the plant's module, containing meristematic tissue -in the form of buds- that allows the growth of branches and leaves.

Although nodes on the trunk can form adventitious roots, roots do not have nodes.

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Stems nodes and internodes link

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.