Practice question
Question
A callus of 5 g dry weight was inoculated on semi-solid medium for growth. The dry weight of the callus was found to increase by 1.5 fold after 10 days of inoculation. The growth index of the culture is _________
Explanation
Growth index defined as (final-initial)/initial. Final =5×1.5=7.5 g, index=(7.5-5)/5=0.5. If defined as final/initial ratio, value is 1.5. The incremental definition highlights biomass increase relative to inoculum, important for plant tissue culture assessment.
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