NEETBotanyPlant - Growth and Development
Discoveries related to PGRs Details of Discovery A. Auxin 1. Identified from sterile filtrates of a fungal pathogen causing "bakanae" disease in rice seedlings. B. Gibberellic Acid 2. Discovered as a volatile substance from ripened oranges that accelerated ripening in bananas. C. Cytokinin 3. Isolated from the tips of coleoptiles of oat seedlings by F.W. Went. D. Ethylene 4. Found to promote callus formation in tobac
Options
- AA - 3, B - 1, C - 4, D - 2, E - 5
- BA - 2, B - 4, C - 1, D - 3, E - 5
- CA - 1, B - 3, C - 5, D - 4, E - 2
- DA - 4, B - 5, C - 3, D - 1, E - 2
Correct answer
A. A - 3, B - 1, C - 4, D - 2, E - 5
Step-by-step solution
A - 3: Auxin was isolated by F.W. Went from the tips of coleoptiles of oat seedlings. B - 1: Gibberellic acid was identified as the active substance in sterile filtrates of the fungal pathogen Gibberella fujikuroi, which caused "bakanae" disease in rice. C - 4: Cytokinin (kinetin) was found to promote callus formation in tobacco stem segments in combination with auxins. D - 2: Ethylene was discovered as a volatile substance from ripened oranges that accelerated ripening in stored unripened bananas. E - 5: Abscisic