Answer: High auxin and low cytokinin promotes root formation; high cytokinin and low auxin promotes shoot formation.
- A High auxin and low cytokinin promotes shoot formation; high cytokinin and low auxin promotes root formation
- B High auxin and low cytokinin promotes root formation; high cytokinin and low auxin promotes shoot formation
- C Equal concentrations of both hormones always promote callus only
- D Cytokinin alone is sufficient for both root and shoot formation depending on concentration
Correct answer: B. High auxin and low cytokinin promotes root formation; high cytokinin and low auxin promotes shoot formation
Explanation: Skoog and Miller demonstrated that the ratio of auxin to cytokinin controls organogenesis in plant tissue culture. A high auxin to low cytokinin ratio promotes root formation, while a high cytokinin to low auxin ratio promotes shoot formation. Equal concentrations typically promote undifferentiated callus growth.
Different fish species occupy different feeding depths in the same pond without competing for food: Catla feeds near the surface, Rohu in the middle zone, and Mrigal or common carp at the bottom - letting a single pond support far more total fish than one species alone.
Concept context
Learn about animal husbandry, plant breeding, tissue culture, biofortification, and single cell protein.
Read the full Strategies for Enhancement in Food Production notes →