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photosynthesis, respiration and ..

Without light, the plant will stop the photosynthesising process, because, light is a limited factor....

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Test 4 Photosynthesis and Respiration Flashcards | Quizlet

Dissolved oxygen concentrations may change dramatically with lake depth. Oxygen production occurs in the top portion of a lake, where sunlight drives the engines of photosynthesis. Oxygen consumption is greatest near the bottom of a lake, where sunken matter accumulates and decomposes. In deeper, , lakes, this difference may be dramatic - plenty of oxygen near the top but practically none near the bottom. If the lake is shallow and easily mixed by wind, the DO concentration may be fairly consistent throughout the water column as long as it is windy. When calm, a pronounced decline with depth may be observed.

Because of the chorophyll contained in most species, they produce oxygen through photosynthesis.

Seasonal changes also affect dissolved oxygen concentrations. Warmer temperatures during summer speed up the rates of photosynthesis and decomposition. When all the plants die at the end of the growing season, their decomposition results in heavy oxygen consumption. Other seasonal events, such as changes in lake water levels, volume of and , and presence of ice cover, also cause natural variation in DO concentrations.

Test 4 Photosynthesis and Respiration

In the presence of sunlight, the photosynthetic production of oxygen is greater than the amount used in respiration.

Oxygen is one of several dissolved gases important to aquatic systems. Dissolved oxygen is necessary to maintain aerobic conditions in surface waters and is considered a primary indicator when assessing the suitability of surface waters to support aquatic life. The oxygen content of natural waters varies with temperature, salinity, turbulence, photosynthetic activity of algae and plants, and atmospheric pressure. Primary sources of oxygen in water bodies include diffusion of atmospheric oxygen across the air-water interface and photosynthesis of aquatic plants.

Primary production (algae) acts as both a source and sink of dissolved oxygen. During daylight hours algal photosynthesis produces oxygen in excess of algal demands (respiration), often resulting in dissolved oxygen levels in excess of saturation, i.e., super-saturation. During nighttime periods when photosynthesis is absent, algal respiration may reduce dissolved oxygen levels significantly. Another mechanism that may increase or decrease dissolved oxygen is transfer through the air-water interface. Typically the transfer is from the atmosphere into the water (re-aeration) because dissolved oxygen in most natural waters is below saturation. However, under supersaturated conditions there is a net transfer of oxygen from the water body to the atmosphere.

AP Biology- Chapter 10- Photosynthesis Flashcards | Quizlet

Facultative respiration, using oxygen bound in nitrates and sulfates, yields less energy than aerobic metabolism.

The process of photosynthesis is illustrated by the equation :

The overall effect of this reaction is to produce new plant life, thereby increasing the number of algae.


The results showed that the amount of oxygen released, or rate of
photosynthesis is directly in proportion to the amount of light or

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Photosynthesis And Cellular Respiration Recycle Oxygen In ..

Prediction : I predict that as I increase the distance between the light source and the Canadian Pondweed (reducing the light intensity), the volume of oxygen produced within the time limit (the measure of the rate of photosynthesis) will decrease.

Photosynthesis and Cellular Respiration Nina R ..

To the degree that pollution contributes oxygen-demanding organic matter (like sewage, lawn clippings, soils from streambank and lakeshore erosion, and from agricultural runoff) or nutrients that stimulate growth of organic matter, pollution causes a decrease in average DO concentrations. If the organic matter is formed in the lake, for example by algal growth, at least some oxygen is produced during growth to offset the eventual loss of oxygen during decomposition. However, in lakes where a large portion of the organic matter is brought in from outside the lake, oxygen production and oxygen consumption are not balanced and low DO may become even more of a problem.

What is the relationship between oxygen and photosynthesis

The least energy yield results from strict anaerobic respiration, where the oxidation of (AH2) is coupled with reduction of B (an oxidized organic compound) to BH2 (a reduced organic compound).

Hydrogen acceptors are used in the sequence of dissolved oxygen first, followed by nitrates, sulfates and oxidized organic compounds, in this general order.

dissolved oxygen | Primary Production | Photosynthesis

Prediction: I predict that the oxygen bubbles will decrease when the lamp is further away from the measuring cylinder, because light intensity is a factor of photosynthesis.

16/01/2018 · dissolved oxygen - Free download as ..

The same basic phenomenon can occur in winter (winterkill) when ice cover removes re-aeration from the atmosphere and snowcover can light-limit algal and macrophyte photosynthesis under the ice. Many lakes in the upper midwest are mechanically re-aerated or injected with air, oxygen or even liquid oxygen to keep ice off of some of the lake and to add oxygen directly to prevent winterkills.

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