Question:
How much photoperiod (hours) is required by long day plants?
How much photoperiod (hours) is required by long day plants?
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Long day plants: > 14 hours.
Short day plants: < 12 hours.
Day neutral plants: no specific requirement.
Short day plants: < 12 hours.
Day neutral plants: no specific requirement.
Updated On: Aug 12, 2026
- < 10 hours
- > 14 hours
- > 18 hours
- > 20 hours
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Plants respond to photoperiod (day length).
They are classified as long day, short day, or day neutral.
Step 2: Key Formula or Approach:
No specific formula.
Need to know the photoperiod requirements.
Step 3: Detailed Explanation:
Long day plants require a day length greater than a critical length.
The critical length is typically around 14 hours.
Short day plants require less than 12-14 hours.
Long day plants flower when day length is > 14 hours.
Thus, long day plants require > 14 hours of photoperiod.
Step 4: Final Answer:
Long day plants require > 14 hours of photoperiod.
Hence, the correct option is (B).
Plants respond to photoperiod (day length).
They are classified as long day, short day, or day neutral.
Step 2: Key Formula or Approach:
No specific formula.
Need to know the photoperiod requirements.
Step 3: Detailed Explanation:
Long day plants require a day length greater than a critical length.
The critical length is typically around 14 hours.
Short day plants require less than 12-14 hours.
Long day plants flower when day length is > 14 hours.
Thus, long day plants require > 14 hours of photoperiod.
Step 4: Final Answer:
Long day plants require > 14 hours of photoperiod.
Hence, the correct option is (B).
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