Take+in+and+use+gases+(oxygen+and+carbon+dioxide)+DG

photosynthesis is one way of the plants using gas

Photosynthesis is the process, which by chlorophyll, green plants, algae, and some bacteria together capture the light energy from the sun and convert it to chemical energy. Chlorophyll is a green substance that is necessary for capturing the sunlight. Virtually all the energy available for life in the earth's biosphere—the zone in which life can exist — is made available through photosynthesis. A quite generalized, unbalanced chemical equation for photosynthesis is CO2 + 2H2A + light energy ± (CH2) + H2O + H2A The formula H2A represents a compound that can be oxidized, that is, from which electrons can be removed; CO2 is carbon dioxide; and CH2 is a generalization for the hydrocarbons incorporated by the growing organism. In the vast majority of photosynthetic organisms—that is, algae and green plants—H2A is water (H2O); in some photosynthetic bacteria ; however, H2A is hydrogen sulfide (H2S). Photosynthesis involving water is the most important and best understood and, therefore, will be discussed here in detail. Photosynthesis consists of two stages: a series of light-dependent reactions that are temperature independent and a series of temperature-dependent reactions that are light independent. Increasing light intensity (within certain limits) but not by increasing temperature can increase the rate of the first series, called the light reaction. In the second series, called the dark reaction, the rate can be increased by increasing temperature (within certain limits) but not by increasing light intensity. (Dan)

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