(B) Guttman $(1957)$ observed that treatment with Kinetin (a type of cytokinin) leads to a rapid increase in the synthesis of $RNA$ within the nuclei

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(B) Guttman $(1957)$ observed that treatment with Kinetin (a type of cytokinin) leads to a rapid increase in the synthesis of $RNA$ within the nuclei of onion root cells. Cytokinins are known to stimulate protein and $RNA$ synthesis,which is essential for cell division and growth.