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Fiche 1,  Justifications,  Anglais

Record number: 1, Textual support number: 1 CONT

Some plants are long day, requiring 14 - 16 hours of sunlight per day to flower. Others are short day requiring only 8 - 9 hours. Others are day neutral and unaffected by day length. Photoperiosim also effects the breeding cycles of farm livestock.  1, fiche 1, Anglais, - long%20day

Record number: 1, Textual support number: 1 OBS

Long-day plants flower only when exposed to day lengths longer than their critical length. These are usually late spring and early summer flowers.  2, fiche 1, Anglais, - long%20day

Fiche 1,  Justifications,  Français

Record number: 1, Textual support number: 1 CONT

La durée du jour commande le rythme sexuel de beaucoup d'êtres vivants : certaines plantes ne fleurissent qu'en jours courts, d'autres seulement en jours longs selon leur sensibilité à la photopériode.  1, fiche 1, Français, - jour%20long

Fiche 1,  Justifications,  Espagnol