In short day plants, flowering is induced by :
Correct answer: B. Photoperiod below a critical length and uninterrupted long night
- A. Photoperiod less than 12 hours
- B. Photoperiod below a critical length and uninterrupted long night
- C. Long night
- D. Short photoperiod and interrupted long night
Explanation
b) : No flowering takes place if the dark period is less than the critical day length. The flowering is inhibited if weak intensity of light is given during the dark period. If the dark period is interrupted mid way by even a single flash of light, no flowering takes place. If this flash is given in the beginning or near the end of the dark phase, they produce flowers.
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Embryonic development covers fertilization, cleavage, formation of the blastula and gastrula, germ layers, organ formation and differentiation. Regeneration describes the replacement of lost tissues or body parts, whereas ageing involves gradual cellular and physiological changes linked to reduced repair, altered metabolism and declining organ function.
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