Because female parents can undergo environmental sex reversal (monoecious reversion) late in the season, certified seed testing mandates pick-wise GOT to determine genetic purity for each harvesting pick separately. (Correct answer: Option 2)
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12
ICAR JRF Seed Science And Technology 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
In TTZ Test, a paddy seed with unstained scutellum is recorded as
Tetrazolium (TTZ) Test Evaluation in Paddy (Oryza sativa):
2,3,5-triphenyl tetrazolium chloride is reduced by active dehydrogenase enzymes into red, water-insoluble triphenyl formazan in living tissues.
In grass caryopses, the scutellum acts as the crucial absorptive and secretory organ supplying hydrolytic enzymes to the endosperm during germination.
If the scutellum remains unstained (completely uncolored / necrotic), the seedling cannot mobilize nutrients, and the seed is officially classified as a Non-germinable seed. (Correct answer: Option 3)
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