The correct option is 2 and 3 only.
Explanation
Rubber is primarily an equatorial crop, though it is also cultivated in tropical and sub-tropical regions under specific conditions. It requires a climate characterized by high heat and significant moisture.
- Statement 1 is Incorrect: Rubber requires heavy rainfall, typically more than 200 cm annually. A rainfall of less than 50 cm is characteristic of arid or semi-arid regions and is insufficient for rubber cultivation.
- Statement 2 is Correct: The crop requires a temperature consistently above 25°C. It thrives in hot climates and does not tolerate frost.
- Statement 3 is Correct: Rubber requires a moist and humid climate. High humidity is essential for the optimal growth of the rubber tree and the production of latex.
Key Takeaway: Natural rubber is a tropical crop that demands heavy rainfall (>200 cm), high temperatures (>25°C), and high humidity.