A) Xanthium
B) tobacco
C) soybean
D) Beta vulgaris
Correct Answer: D
Solution :
Long day plant requires a longer day light period (usually 14 to 18 hours) in a 24 hours cycle for subsequent flowering, eg. Beta vulgaris (sugar beet), Spinacea (spinach), Hysocyamus niger (henbane), etc. These are also known as short night plants because they require only short night (usually 6 to 8 hours).
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