Step 1: Understanding callus in tissue culture.
Callus is an unorganized mass of actively dividing plant cells produced under sterile culture conditions. Step 2: Role of growth hormones.
Growth hormones like auxins and cytokinins regulate cell division and metabolism in callus tissue. Step 3: Effect on callus.
Under specific hormonal conditions, callus is induced to synthesize valuable secondary metabolites such as alkaloids and phenolics. Step 4: Conclusion.
Growth hormones are provided to callus mainly to induce the formation of secondary metabolites.