Discussion
............. is not a naturally occurring plant growth regulator, and it does not occur as a base in the DNA of any species :
Answer: B
The compound is kinetin.
Kinetin (6-furfurylaminopurine) was discovered by Miller and Skoog in the 1950s in autoclaved herring sperm DNA, as a breakdown product formed during heating. It is a synthetic cytokinin used widely in tissue culture, but it is not one of the regulators plants make, and it is not a normal base of DNA, which is the statement the question quotes.
The other three are natural plant hormones. Indole-3-acetic acid is the main natural auxin, zeatin is the main natural cytokinin, first isolated from maize, and gibberellins are a family of natural growth regulators first found in the fungus Gibberella and in plants.
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