7
Which of the following phenomena is not associated with the dry state of the seed?
EXPLANATION
Embryogenesis, Seed Structure & Orthodox/Reca
- Biochemistry of Dry Seeds:
- In air-dry orthodox seeds (moisture content $\lt 10 - 12\%$, water activity $a_w \lt 0.6$), the cytoplasm undergoes vitrification into a highly viscous glassy state (amorphous solid).
- In the dry state, diffusion is extremely restricted, preventing free water from participating in enzymatic reactions; therefore, enzymatic DNA repair cannot occur (DNA repair requires metabolic hydration during seed imbibition/priming).
- Non-enzymatic deteriorative processes (lipid autoxidation, Maillard browning, and free radical generation) continue slowly in dry seeds. (Correct answer: Option 4)
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