Question

photosynthesis in temperate regions plants​

Answer 1

GREEN plants may be divided into two groups, C3 and C4 species, depending on whether the first product of photosynthetic CO2 fixation is phosphoglycerate (C3) or oxaloacetate (C4). In all species studied to date the C4 metabolism is associated with either ‘Kranz’ leaf anatomy, low CO2 compensation points or low 13C/12C ratios. Included in the C4 category are many of the highest yielding and rapidly growing crops, most of which are believed to have originated in tropical and subtropical regions. C4 species so far studied, which are mostly of tropical origin, attain their highest photosynthetic rates at leaf temperatures of about 30 °C and above1,2 so that selective advantages derived from photosynthetic rate will only be evident in tropical and subtropical regions1,2. A recent compilation of the reported rates of photosynthesis and productivity of C3 and C4 crops3 showed that differences in maximum annual dry matter yields could be explained by differences in lengths of growing season. It thus remains to be shown that there is a selective advantage which is a direct consequence of photosynthetic capacity of C4 species or that there is an inherent physiological barrier to the adaptation of C4 species to a similar range of latitudes to C3 species.

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Answer 2

Photosynthesis is a chemical reaction through which plants absorb light and transform it into sugars and oxygen. It is a highly complex process that is vital to nearly all organisms on Earth. But exactly how does it work?

Without the sun, photosynthesis would stop and no life could be sustained.

Plants are autotrophic organisms, which means that plants produce their own food and they support other organisms. Without the sun, photosynthesis would stop and no life could be sustained.

Photosynthesis is the chemical reaction where carbon dioxide (CO2) and water form sugars and oxygen in the presence of light energy. The sugars formed by photosynthesis are used by the plants as a food energy source. Under natural conditions, the sun provides the energy to trigger photosynthesis.

Plants use a specific portion of the solar (light) spectrum for photosynthesis, which is called Photosynthetic Active Radiation (PAR) . PAR is the region of the solar radiation between 400 and 700 nm.

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