Question:
Identify the long day plants
(A). Sugarbeet
(B). Tobacco
(C). Cotton
(D). Potato
Choose the correct answer from the options given below:
Identify the long day plants
(A). Sugarbeet
(B). Tobacco
(C). Cotton
(D). Potato
Choose the correct answer from the options given below:
(A). Sugarbeet
(B). Tobacco
(C). Cotton
(D). Potato
Choose the correct answer from the options given below:
Show Hint
To remember: Most temperate winter-season crops (like wheat, barley, oat, sugarbeet, spinach) are long-day plants, whereas tropical summer crops (like rice, maize, sorghum) are short-day plants.
Updated On: Jul 13, 2026
- (A), (B) and (D) only.
- (B) and (C) only.
- (A) and (D) only.
- (B) and (D) only.
Show Solution
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Photoperiodism is the physiological reaction of plants to the relative lengths of daylight and darkness.
Plants are classified as long-day plants (LDPs), short-day plants (SDPs), or day-neutral plants (DNPs) based on their photoperiodic requirements for flowering.
Step 2: Detailed Explanation:
- Sugarbeet (Beta vulgaris) [A]: A classic long-day plant. It requires a photoperiod longer than a critical day length (usually 14-16 hours of light) to initiate flowering and seed production.
- Potato (Solanum tuberosum) [D]: Cultivated varieties require long-day conditions for flowering and reproductive growth, although tuberization is often promoted by shorter days.
- Tobacco (Nicotiana tabacum) [B]: Primarily a short-day plant (especially the Maryland Mammoth variety used in historical photoperiodism studies), though some commercial varieties are day-neutral.
- Cotton (Gossypium species) [C]: A day-neutral plant. Its flowering is not regulated by photoperiod and can occur across a wide range of day lengths.
Thus, Sugarbeet and Potato are classified as long-day plants among the choices provided.
Step 3: Final Answer:
The long-day plants are Sugarbeet (A) and Potato (D).
Photoperiodism is the physiological reaction of plants to the relative lengths of daylight and darkness.
Plants are classified as long-day plants (LDPs), short-day plants (SDPs), or day-neutral plants (DNPs) based on their photoperiodic requirements for flowering.
Step 2: Detailed Explanation:
- Sugarbeet (Beta vulgaris) [A]: A classic long-day plant. It requires a photoperiod longer than a critical day length (usually 14-16 hours of light) to initiate flowering and seed production.
- Potato (Solanum tuberosum) [D]: Cultivated varieties require long-day conditions for flowering and reproductive growth, although tuberization is often promoted by shorter days.
- Tobacco (Nicotiana tabacum) [B]: Primarily a short-day plant (especially the Maryland Mammoth variety used in historical photoperiodism studies), though some commercial varieties are day-neutral.
- Cotton (Gossypium species) [C]: A day-neutral plant. Its flowering is not regulated by photoperiod and can occur across a wide range of day lengths.
Thus, Sugarbeet and Potato are classified as long-day plants among the choices provided.
Step 3: Final Answer:
The long-day plants are Sugarbeet (A) and Potato (D).
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