• Statement I is correct: The cardinal temperatures for rice (Oryza sativa) germination are minimum $10–12\text{ °C}$, optimum $30–32\text{ °C}$, and maximum $36–38\text{ °C}$ (growth ceases above $40–42\text{ °C}$).
• Statement II is incorrect: For wheat (Triticum aestivum), the cardinal temperatures for germination are minimum $3–4.5\text{ °C}$, optimum $20–22\text{ °C}$ (or $20–25\text{ °C}$), but the maximum temperature limit for wheat germination is $30–32\text{ °C}$ (never up to $40\text{ °C}$, as thermal stress completely inhibits germination above $35\text{ °C}$).
• Therefore, Statement I is correct but Statement II is not correct, confirming Option 3.

• The specific heat of moist soil ($C_m$) containing moisture fraction $m$ (on dry basis) is given by the weighted heat capacity formula:
  $$C_m = \frac{C_s + m \times C_w}{1 + m}$$
  where $C_s = 0.2\text{ cal/g}$, $C_w = 1.0\text{ cal/g}$, and $m = 20\% = 0.20$.
• Substituting the numerical values:
  $$C_m = \frac{0.2 + (0.20 \times 1.0)}{1 + 0.20} = \frac{0.2 + 0.2}{1.20} = \frac{0.40}{1.20} = 0.333\text{ cal/g}$$
• Crucially, specific heat is expressed per gram (cal/g) rather than per kilogram (cal/kg).
• Thus, Option 4 (0.33 cal/g) is the scientifically and dimensionally correct answer.

Cardinal temperatures for crop germination and growth:

• Maize (warm-season $C_4$ cereal): Minimum cardinal temperature is $8-10^\circ\text{C}$, optimum is $30-32^\circ\text{C}$, maximum is $40-44^\circ\text{C}$.
• Wheat (cool-season $C_3$ cereal): Minimum cardinal temperature is $3.0-4.5^\circ\text{C}$, optimum is $20-25^\circ\text{C}$, maximum is $30-32^\circ\text{C}$.