Single Choice

One set of a plant was grown at 12 hours a day and 12 hours a night period cycles and it flowered. While in the other set, night phase was interrupted by flash of light and it did not flower. Under which one of the following categories will you place this plant?

AShort-day
Correct Answer
BLong-day
CDarkness-neutral
DDay-neutral

Solution

On the basis of the response of plants to photoperiodism, plants are classified as day-neutral plants. These are the ones which flower regardless of the length of the period of light it is exposed to, e.g., rice, corn, and the cucumber.
Long-day plants are the plants that flower when the length of the day is more than the critical light period.
Short-day plants are the plants that flower only when the length of the day is less than or about 12 hours.
All spring flowering plants are short day plants, such as Chrysanthemum, poinsettia and Christmas cactus. If these plants are exposed to more than 12 hours of light per day, blooming of flowers do not take place. The plants mentioned here thus belong to short day plants.

SIMILAR QUESTIONS

Reproduction and Growth in Plants

Both a short day plant and a long day plant can produce flower simultaneously in a given place. Explain.

Reproduction and Growth in Plants

Four potted plants (I, II, Ill, and IV) of a short day plant, which has the critical period of 14 hours; are taken and exposed to light for different time periods. The light periods given are listed in the table. Potted plant Photoperiod I 10 hrs II 15 hrs III 16 hrs IV 20 hrs Which potted plant will show flowering after exposure to light?

Reproduction and Growth in Plants

Classify the following plants into Long-Day Plants (LDP), Short Day Plants (SDP) and Day Neutral Plants (DNP): Xanthium, Henbane (Hyoscyamus niger), Spinach, Rice, Strawberry, Bryophyllum, Sunflower, Tomato, Maize.

Reproduction and Growth in Plants

Importance of day length in flowering of plants was first shown in

Reproduction and Growth in Plants

Write three differences between short day and long day plants.

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