PHOTOSYNTHESIS

photosynthesis

(noun) synthesis of compounds with the aid of radiant energy (especially in plants)

Source: WordNet® 3.1


Etymology

Noun

photosynthesis (usually uncountable, plural photosyntheses)

(biology) Any process by which plants and other photoautotrophs convert light energy into chemical energy,

principally, oxygenic photosynthesis, any process by which plants and algae convert water and carbon dioxide into carbohydrates and waste oxygen using solar energy.

also, non-oxygenic photosynthesis, used by purple and green bacteria, heliobacteria, and acidobacteria.

Source: Wiktionary


Pho`to*syn"the*sis, n. (Plant Physiol.)

Definition: The process of constructive metabolism by which carbohydrates are formed from water vapor and the carbon dioxide of the air in the chlorophyll-containing tissues of plants exposed to the action of light. It was formerly called assimilation, but this is now commonly used as in animal physiology. The details of the process are not yet clearly known. Baeyer's theory is that the carbon dioxide is reduced to carbon monoxide, which, uniting with the hydrogen of the water in the cell, produces formaldehyde, the latter forming various sugars through polymerization. Vines suggests that the carbohydrates are secretion products of the chloroplasts, derived from decomposition of previously formed proteids. The food substances are usually quickly translocated, those that accumulate being changed to starch, which appears in the cells almost simultaneously with the sugars. The chloroplasts perform photosynthesis only in light and within a certain range of temperature, varying according to climate. This is the only way in which a plant is able to organize carbohydrates. All plants without a chlorophyll apparatus, as the fungi, must be parasitic or saprophytic. --Pho`to*syn*thet"ic (#), a. -- Pho`to*syn*thet"ic*al*ly (#), adv.

Source: Webster’s Unabridged Dictionary 1913 Edition



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Word of the Day

17 November 2024

MONASTICISM

(noun) asceticism as a form of religious life; usually conducted in a community under a common rule and characterized by celibacy and poverty and obedience


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Coffee Trivia

An article published in Harvard Menโ€™s Health Watch in 2012 shows heavy coffee drinkers live longer. The researchers examined data from 400,000 people and found out that men who drank six or more coffee cups per day had a 10% lower death rate.

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