A) lower concentration of cytokinin and higher concentration of auxins
B) only cytokinin and no auxins
C) no cytokinin and only auxins
D) higher concentration of cytokinin and lower concentration of auxins
Correct Answer: A
Solution :
In tissue culture, shoot regeneration is promoted by a cytokinin. And root regeneration is promoted by auxin like NAA (Naphthalene Acetic Acid). The shoot and root regenerations are generally controlled by auxin - cytokinin balance. An excess of auxin promotes root regeneration, whereas that of cytokinin promotes shoot regeneration. Roots regenerate from the lower end of these shoots to give complete planriets.
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