Question:
Given below are two statements:
Statement (I) : Long day types onions are cultivated in temperate or hilly regions.
Statement (II) : The onion crop is more sensitive to temperature that plays more important role in bulb formation than photoperiod.
In light of the above statements, choose the most appropriate answer from the options given below.
Given below are two statements:
Statement (I) : Long day types onions are cultivated in temperate or hilly regions.
Statement (II) : The onion crop is more sensitive to temperature that plays more important role in bulb formation than photoperiod.
In light of the above statements, choose the most appropriate answer from the options given below.
Statement (I) : Long day types onions are cultivated in temperate or hilly regions.
Statement (II) : The onion crop is more sensitive to temperature that plays more important role in bulb formation than photoperiod.
In light of the above statements, choose the most appropriate answer from the options given below.
Show Hint
Short-day onions require only $11\text{ to }12 \text{ hours}$ of day length to initiate bulbing, making them highly suited for cultivation in the plains of India during winter.
Updated On: Jul 23, 2026
- Both Statement (I) and Statement (II) are correct.
- Both Statement (I) and Statement (II) are incorrect.
- Statement (I) is correct but Statement (II) is incorrect.
- Statement (I) is inactive but Statement (II) is correct.
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Onion (*Allium cepa*) is a photoperiod-sensitive crop. Bulb initiation and development are regulated by day length (photoperiod) and temperature.
Step 2: Detailed Explanation:
Let us evaluate both statements:
- Statement (I): Onion cultivars are classified into short-day, intermediate-day, and long-day types based on their photoperiod requirements.
Long-day onions require $14 \text{ hours}$ or more of daylight to initiate bulbing.
These conditions occur naturally during summer at higher latitudes, making long-day onions suitable for temperate or hilly regions (like the northwestern Himalayan states of India).
Therefore, Statement (I) is correct.
- Statement (II): This statement asserts that temperature plays a more important role in bulb formation than photoperiod.
This is incorrect. While temperature does influence growth rates, photoperiod is the primary environmental trigger that initiates bulb formation.
If a long-day onion is grown under short-day conditions, it will continue to produce leaves indefinitely and fail to form a bulb, regardless of the temperature.
Therefore, photoperiod plays a far more critical role in bulb initiation than temperature.
Thus, Statement (I) is correct, but Statement (II) is incorrect.
Step 3: Final Answer:
The correct option is (C) as Statement (I) is correct but Statement (II) is incorrect.
Onion (*Allium cepa*) is a photoperiod-sensitive crop. Bulb initiation and development are regulated by day length (photoperiod) and temperature.
Step 2: Detailed Explanation:
Let us evaluate both statements:
- Statement (I): Onion cultivars are classified into short-day, intermediate-day, and long-day types based on their photoperiod requirements.
Long-day onions require $14 \text{ hours}$ or more of daylight to initiate bulbing.
These conditions occur naturally during summer at higher latitudes, making long-day onions suitable for temperate or hilly regions (like the northwestern Himalayan states of India).
Therefore, Statement (I) is correct.
- Statement (II): This statement asserts that temperature plays a more important role in bulb formation than photoperiod.
This is incorrect. While temperature does influence growth rates, photoperiod is the primary environmental trigger that initiates bulb formation.
If a long-day onion is grown under short-day conditions, it will continue to produce leaves indefinitely and fail to form a bulb, regardless of the temperature.
Therefore, photoperiod plays a far more critical role in bulb initiation than temperature.
Thus, Statement (I) is correct, but Statement (II) is incorrect.
Step 3: Final Answer:
The correct option is (C) as Statement (I) is correct but Statement (II) is incorrect.
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