Plants growing in swampy areas, come out of the ground and grows vertically. Such roots are known as:

The correct answer is Pneumatophores

Explanation:

• Pneumatophores are specialized roots that grow vertically out of the ground in swampy or waterlogged areas.
• These roots help in gas exchange by allowing oxygen to reach the submerged root systems.
• Plants that commonly have pneumatophores include mangroves and other species adapted to grow in marshy environments.
• Pneumatophores are found in Rhizophora. Pneumatophores are the respiratory roots found in plants growing in salty marshes.

Other Options:

• Taproot is a dominant root from which other roots sprout laterally and grows faster than the branch roots. Example: Carrot, Radishes and Beetroot.
• Fibrous roots have very fine branches of approximately the same length. Example: onions, tomatoes, corn, rice and wheat. 
• Stilt roots: In Maize and Sugarcane, roots arise from the first few nodes of the stem and penetrate obliquely down into the soil and giving support to the plant. They are called Stilt roots. Stilt roots are the adventitious roots that help in supporting the plant body. It is also known as the support roots. They develop from the basal nodes of the main stem and grow obliquely