Question

Kinetin was discovered from the ______________

• A. foolish seedlings of rice
• B. coleoptile of canary grass
• C. human urine
• D. autoclaved herring sperm DNA

Answer 1

The correct option is D autoclaved herring sperm DNA

Kinetin was discovered from autoclaved herring sperm DNA. Herring is a kind of fish. Kinetin is a type of cytokinin. It promotes cell division. It was originally isolated by Miller and Skoog.

Gibberellin was first discovered from a fungal pathogen, Gibberella fujikuroi. It was discovered by E.Kurosawa while working on the foolish seedling disease.

The bending of the coleoptile of canary grass towards the light source was observed by Francis Darwin. He observed that the tip of the coleoptile was the site of transmittable influence that caused the bending of the entire coleoptile. Auxin was isolated by F.W. Went from tips of coleoptiles of oat seedlings.

But auxin for the first time was isolated from human urine. Auxin is a plant growth promoter that helps to promote apical dominance (a phenomenon in which the growth of the main central stem of the plant is more as compared to the other stems).