Photoperiodism was first characterised in :
Correct answer: A. Tobacco
- A. Tobacco
- B. Potato
- C. Tomato
- D. Cotton
Explanation
(a) : Photoperiodism is the response to duration and timings of light and dark period. It was first studied by W.W. Garner and H.A. Allard (1920) in tobacco. They observed that Maryland Mammoth variety of tobacco could be made to flower in Summer by reducing the light hours with artificial darkening.
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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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