Concept:Maize is a warm-season crop, so it needs warm temperatures and moisture; low temperature is not required.
Explanation:High temperature, in the range of
21∘C to
30∘C, supports germination, vegetative growth, and grain filling.
Adequate rainfall is essential because maize needs water during tasseling and fruiting.
Relative humidity also helps pollination and reduces excessive water loss from the plant.
In contrast, low temperature or frost damages maize plants and severely lowers yield.
Maize cannot tolerate cold and fails to grow properly under such conditions.
This shows that cold conditions are not an essential factor for maize production; they are actually a limiting factor.
Therefore, the factor that is the exception is low temperature.
Answer:D. low temperature