Tyloses are found in

Explanation:

• Tyloses are the balloon-like outgrowth on the parenchyma cells of the xylem vessels, found in the woody tissue (heartwood) of the dicot stems.
• Tyloses are filled with starch, resin and other substances and block water movement and thus can cause injury because of dehydration.
• In some trees with large vessels, tyloses can aid in conversion of softwood to heartwood. They also play a role in plant defense mechanisms.
• Sclerenchyma fibres are elongated cells with thick lignified walls.
• Sclereids are the reduced form of sclerenchyma cells and are broad.
• Secondary phloem helps in secondary growth and helps in the transportation of the nutrients. 

Final Answer

Hence, the correct option is D i.e., secondary xylem