A) sugars
B) vitamins
C) amino acids
D) hormones
Correct Answer: D
Solution :
In plant tissue culture, the callus tissues can be regenerated into complete plantlets primarily by altering the concentration of hormones. Infact, shoot and root regenerations are generally controlled by auxin-cytokinin balance. Usually an excess of auxins promotes root regenration while cytokinins promote shoot regeneration.
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