dark period (in botany) The period considered to be critical in the responses of plants to changes in day length (see photoperiodism). It is believed that such responses, which include the onset of flowering, are determined by the length of the period of darkness that occurs between two periods of light.
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Language, Linguistics, and Literary Terms , dark often used figuratively to mean unenlightened or ominous. Dark Ages the period in western Europe between the fall of the Roman Empire and the hi… Dusk , dusk •Basque, Monégasque •ask, bask, cask, flask, Krasnoyarsk, mask, masque, task •facemask •arabesque, burlesque, Dantesque, desk, grotesque, humore… Photoperiodism , Photoperiodism Photoperiodism is an organism's response to the relative lengths of day and night (i.e., the photoperiod). We have always known that p… Length , length / leng(k)[unvoicedth]; lenth/ • n. 1. the measurement or extent of something from end to end; the greater of two or the greatest of three dime… dark adaptation , dark adaptation In the eye, the visual pigment rhodopsin is formed by reaction between vitamin A aldehyde and the protein opsin, and is bleached by e… Silurian Period , In geologic time , the Silurian Period, the third period of the Paleozoic Era , covers the time from roughly 440 million years ago (mya) until 410 my…
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