Aquatic Plants and Dissolved Oxygen Levels Quiz

Factors affecting DO include the amount of photosynthetically produced oxygen remaining high at greater ______ intensities.

The oxygen level in a tropical pond peaks between 2.00 pm and 5.00 pm due to ______.

DO decreases with the increase in ______.

DO is 5mg/l at 5°C and 12mg/l at 0°C. DO decreases with the increase in ______.

The increase in salinity alternately increases ______ and decomposition.

In stagnant lentic pools with decaying vegetation, oxygen content often reaches a stage of complete depletion in the form of ______.

Abiotic factors can be divided into physical and ______ factors

The most important physical factor is ______

The most important chemical factor is dissolved oxygen ______

Among the abiotic factors are Temperature, Light penetration, Salinity, Dissolved oxygen, Turbidity, Velocity or water ______

In a polluted water with an average depth of 1.5 meters, the lowest night time temperature was 26.6°C, the highest day time temperature was 32°C with a variation of ______

Flowing lotic waters of streams and rivers lack such wide fluctuations in ______

Most freshwater organisms are ______ with a narrow and short range temperature tolerance.

Light provides protection to the light sensitive species by obstructing substances like suspended ______.

The degree of obstruction of light influences the productivity of freshwater ecosystems, affecting the growth of vegetation like phytoplankton and rooted vascular ______.

Running water contains little plant or animal plankton not due to the lack of sunlight but because of the action of the ______.

Light controls the orientation and changes in position of attached species like ______.

Light also causes the diurnal migration of planktonic species in freshwater due to its influence on their ______ of growth.