The string section.
The cello belongs to the strings section, and is usually used in most string quartets, and is always required in orchestras.
"The orchestra sounded amazing, especially the cello section."
Professional orchestras usually have 5-10 cellos in one section depending on the size of the orchestra and nature of the performance.
Trumpets are in Brass Section of an Orchestra.
Vocals are their own section in an orchestra
The string section in a piece of music is the melody played by string instruments such as the violin, cello or viola. The string section in an orchestra is the string instruments in the orchestra, again the violin, cello and viola.
The String Section
Cymbals belong to the percussion section of an orchestra. Cymbals have, relative to other instruments in an orchestra, an unique timbre which allows them to be heard through the most loudest orchestrations.
Low Bass
The violin is part of the strings group in an orchestra, which also includes the viola, the cello, and double bass.The violin is in the string section, along with the viola and the bass.
Trumpet is in the brass section.
Woodwind, as far as I know.