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Which one is a long-day plant? [2001]
- a)Tobacco
- b)Glycine max
- c)Mirabilis jalapa
- d)Spinach
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Which one is a long-day plant? [2001]a)Tobaccob)Glycine maxc)Mirabilis...
Long day plants undergo flowering after receiving light above a critical day length. e.g. Spinach, sugarbeet. Short day plants flower only when they receive light below a critical day length. e.g. Glycine max, Tobacco.
Most Upvoted Answer
Which one is a long-day plant? [2001]a)Tobaccob)Glycine maxc)Mirabilis...
Long-Day Plants
Long-day plants are those plants which require a longer duration of light exposure than darkness. They grow, flower and set seeds when exposed to longer days than their critical day length. Generally, these plants need a critical day length of more than 12 hours of light in a 24-hour cycle.
Examples of Long-Day Plants
Some examples of long-day plants are:
1. Spinach
2. Lettuce
3. Oats
4. Barley
5. Wheat
6. Rye
7. Carnations
8. Chrysanthemums
Answer Explanation
Among the given options, only spinach is a long-day plant. Glycine max (soybean) is a short-day plant, Mirabilis jalapa (four o'clock flower) is a day-neutral plant, and tobacco is also a day-neutral plant.
Long-day plants are those plants which require a longer duration of light exposure than darkness. They grow, flower and set seeds when exposed to longer days than their critical day length. Generally, these plants need a critical day length of more than 12 hours of light in a 24-hour cycle.
Examples of Long-Day Plants
Some examples of long-day plants are:
1. Spinach
2. Lettuce
3. Oats
4. Barley
5. Wheat
6. Rye
7. Carnations
8. Chrysanthemums
Answer Explanation
Among the given options, only spinach is a long-day plant. Glycine max (soybean) is a short-day plant, Mirabilis jalapa (four o'clock flower) is a day-neutral plant, and tobacco is also a day-neutral plant.
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Community Answer
Which one is a long-day plant? [2001]a)Tobaccob)Glycine maxc)Mirabilis...
The term long-day describes plants that begin forming flower buds when the days are longer than their critical day length.
•Two common long-day plants are dill and spinach. Both these plants will initiate flowers when the day lengths are longer than their particular critical day length:
Dill critical day length: 11 hrs.
Spinach (some types) critical day length: 13 hrs.
○other common long-day plants include foxglove, lettuce, petunia, sedum, and hibiscus.
•Two common long-day plants are dill and spinach. Both these plants will initiate flowers when the day lengths are longer than their particular critical day length:
Dill critical day length: 11 hrs.
Spinach (some types) critical day length: 13 hrs.
○other common long-day plants include foxglove, lettuce, petunia, sedum, and hibiscus.
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Which one is a long-day plant? [2001]a)Tobaccob)Glycine maxc)Mirabilis jalapad)SpinachCorrect answer is option 'D'. Can you explain this answer?
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