Final answer:
Teodoro Plata was a founding member of the Katipunan and played a crucial role in the Philippine Revolution by organizing activities and writing for the movement's publication 'Kalayaan'.
Step-by-step explanation:
The contribution of Teodoro Plata to the Katipunan is historically significant. As a founding member, Plata played a crucial role in opposing Spanish colonial rule in the Philippines. Along with Andres Bonifacio and Ladislao Diwa, Plata co-founded the Katipunan, which became the pivotal force behind the Philippine Revolution.
The Katipunan was a secret society that initiated the independence movement against Spain, which eventually resulted in the formation of the First Philippine Republic.
Plata was deeply involved in the secret and revolutionary activities that culminated in a broader national uprising for Philippine sovereignty. His involvement was not only in organizing aspects but also in writing for the Katipunan publication, 'Kalayaan' (Freedom), which was instrumental in raising awareness and support for the movement.