Podcast
Questions and Answers
Factors affecting DO include the amount of photosynthetically produced oxygen remaining high at greater ______ intensities.
light
The oxygen level in a tropical pond peaks between 2.00 pm and 5.00 pm due to ______.
photosynthesis
DO decreases with the increase in ______.
temperature
DO is 5mg/l at 5°C and 12mg/l at 0°C. DO decreases with the increase in ______.
Signup and view all the answers
The increase in salinity alternately increases ______ and decomposition.
Signup and view all the answers
In stagnant lentic pools with decaying vegetation, oxygen content often reaches a stage of complete depletion in the form of ______.
Signup and view all the answers
Abiotic factors can be divided into physical and ______ factors
Signup and view all the answers
The most important physical factor is ______
Signup and view all the answers
The most important chemical factor is dissolved oxygen ______
Signup and view all the answers
Among the abiotic factors are Temperature, Light penetration, Salinity, Dissolved oxygen, Turbidity, Velocity or water ______
Signup and view all the answers
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 ______
Signup and view all the answers
Flowing lotic waters of streams and rivers lack such wide fluctuations in ______
Signup and view all the answers
Most freshwater organisms are ______ with a narrow and short range temperature tolerance.
Signup and view all the answers
Light provides protection to the light sensitive species by obstructing substances like suspended ______.
Signup and view all the answers
The degree of obstruction of light influences the productivity of freshwater ecosystems, affecting the growth of vegetation like phytoplankton and rooted vascular ______.
Signup and view all the answers
Running water contains little plant or animal plankton not due to the lack of sunlight but because of the action of the ______.
Signup and view all the answers
Light controls the orientation and changes in position of attached species like ______.
Signup and view all the answers
Light also causes the diurnal migration of planktonic species in freshwater due to its influence on their ______ of growth.
Signup and view all the answers
