Question:
Given below are two statements:
Statement (I): Most typical tropical crops are short-day plants while those of higher latitudes are generally long-day plants.
Statement (II): The duration of night or complete darkness is more important than the length of the day.
In light of the above statements, choose the most appropriate answer from the options given below.
Given below are two statements:
Statement (I): Most typical tropical crops are short-day plants while those of higher latitudes are generally long-day plants.
Statement (II): The duration of night or complete darkness is more important than the length of the day.
In light of the above statements, choose the most appropriate answer from the options given below.
Statement (I): Most typical tropical crops are short-day plants while those of higher latitudes are generally long-day plants.
Statement (II): The duration of night or complete darkness is more important than the length of the day.
In light of the above statements, choose the most appropriate answer from the options given below.
Show Hint
Remember that 'Short-Day' is physiologically equivalent to 'Long-Night'.
Uninterrupted darkness is the true driving force behind photoperiodic induction.
Uninterrupted darkness is the true driving force behind photoperiodic induction.
Updated On: Jul 13, 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 incorrect but Statement (II) is correct.
Show Solution
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Photoperiodism is the physiological reaction of organisms (especially plants) to the relative lengths of day and night.
Plants are classified into short-day plants (SDPs), long-day plants (LDPs), and day-neutral plants (DNPs) depending on their flowering requirements.
Step 2: Detailed Explanation:
Statement (I) asserts that typical tropical crops are short-day plants, while higher latitude crops are long-day plants.
This is correct.
Tropical regions experience warm temperatures with relatively short and uniform day lengths (typically less than 12 hours) throughout the year.
Crops originating in the tropics (e.g., rice, maize, sorghum) are adapted to these conditions and flower when days are short.
Temperate regions (higher latitudes) experience very long days during the summer crop season.
Temperate crops (e.g., wheat, barley, sugar beet) are adapted to these high-latitude conditions and require longer photoperiods to trigger flowering.
Statement (II) states that the duration of night or complete darkness is more important than day length.
This is correct.
Physiological experiments show that photoperiodic responses are governed by the length of the uninterrupted dark period.
For example, if a short-day plant is exposed to a flash of light during its dark phase, it will fail to flower.
This indicates that short-day plants are actually 'long-night' plants, requiring a continuous dark period of critical duration.
Thus, both statements are correct.
Step 3: Final Answer:
Therefore, both Statement (I) and Statement (II) are correct.
Photoperiodism is the physiological reaction of organisms (especially plants) to the relative lengths of day and night.
Plants are classified into short-day plants (SDPs), long-day plants (LDPs), and day-neutral plants (DNPs) depending on their flowering requirements.
Step 2: Detailed Explanation:
Statement (I) asserts that typical tropical crops are short-day plants, while higher latitude crops are long-day plants.
This is correct.
Tropical regions experience warm temperatures with relatively short and uniform day lengths (typically less than 12 hours) throughout the year.
Crops originating in the tropics (e.g., rice, maize, sorghum) are adapted to these conditions and flower when days are short.
Temperate regions (higher latitudes) experience very long days during the summer crop season.
Temperate crops (e.g., wheat, barley, sugar beet) are adapted to these high-latitude conditions and require longer photoperiods to trigger flowering.
Statement (II) states that the duration of night or complete darkness is more important than day length.
This is correct.
Physiological experiments show that photoperiodic responses are governed by the length of the uninterrupted dark period.
For example, if a short-day plant is exposed to a flash of light during its dark phase, it will fail to flower.
This indicates that short-day plants are actually 'long-night' plants, requiring a continuous dark period of critical duration.
Thus, both statements are correct.
Step 3: Final Answer:
Therefore, both Statement (I) and Statement (II) are correct.
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