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Question
What are long-day plants (LDP)? Give two examples.
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Solution
- Plants that flower usually during summer are called long-day plants. They require a longer duration of light than the critical photoperiod, for flowering.
- They are called short-night plants as they require a short dark period.
- When the long dark period is interrupted by a brief flash of light, LD plants can flower e.g. pea, radish, sugar beat,
- Example: cabbage, spinach, wheat, poppy, etc.
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Long Answer Question:
Describe the types of plants on the basis of photoperiod required, with the help of suitable examples.
Describe the mechanism of photoperiodic induction of flowering.
The photoperiod in plants is perceived at ______.
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.
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- Phytochrome pigment exists in two forms.
- Two forms of phytochrome are interconvertible.
- Pfr form of phytochrome inhibits flowering in SDP, during day time.
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- During day time Pr form accumulates in plants.
While studying flowering behaviour in ______ and ______ plant, Garner and Allard discovered photoperiodism.
