Step 1: Understanding the Question:
This question tests knowledge of potato cultivation and its environmental requirements.
Step 2: Detailed Explanation:
Statement I:
Potato is a crop of cool moist regions.
It grows best when cool nights (10-15°C) alternate with warm days (20-25°C) during tuber formation.
This temperature regime promotes tuber initiation and development.
This statement is true.
Statement II:
Irrigation or rainfall at or just before tuber initiation increases (not decreases) the number of tuber sets.
Moisture availability is critical for tuber initiation.
Water stress at this stage reduces tuber number and yield.
This statement is false.
Step 3: Final Answer:
Thus, Statement I is correct but Statement II is false, which corresponds to option (C).
[0.5cm]