Tag: human influences on the environment
Questions Related to human influences on the environment
BOD of a pond is related to .......... in per unit volume of water.
-
All the plants
-
All the nektons
-
All the microbes
-
All the animals
Biochemical oxygen demand (BOD) is the amount of dissolved oxygen needed by aerobic microorganisms to break down organic material present in a given water sample at certain temperature over a specific period of time. Thus, the correct answer is option C.
BOD is related to
-
Organic pollutants
-
Detergents
-
Putrescibility
-
Inorganic pollutants
BOD is abbreviated form of biological oxygen demand. It is the amount of oxygen required by microbes to break down the organic matter present in a certain volume of a sample of water. The amount of BOD in the water is a measure of a number of organic pollutants in the water.
High BOD values for a river means that river water
-
Have no microbes
-
Have more bacteria
-
Is highly polluted
-
Is highly clean
C.O.D. stands for
-
Chemical oxygen demand
-
Control of diesel
-
Csiumoxide deposition
-
Cemistry of depositions
C.O.D. stands for chemical oxygen demand. It is the measurement of the pollution which is based on the chemical decomposition of organic and oxidation of the inorganic contaminants present in dissolved water. It is mainly used against waste water which is contaminated by domestic and industrial wastes.
In the polluted water, the values of
-
C.O.D. slightly higher than B.O.D.
-
C.O.D. much higher than B.O.D.
-
B.O.D. slightly higher than C.O.D.
-
B.O.D. much higher than C.O.D.
When huge amount of CO$ _2$ is dumped into a river, the BOD will
-
Increase
-
Slightly decrease
-
Remain unchanged
-
Decrease
Biological Oxygen Demand is a measurement of the amount of dissolved oxygen that is used by aerobic microorganisms when decomposing organic matter in water. It is expressed in milligrams of oxygen consumed per liter of the sample during 5 days of incubation at 20°C and is used to determine the degree of organic pollution of water. Hence when a huge amount of carbon dioxide is added BOD will not be affected. Thus, the correct answer is option C.
A rapid growth of photosynthetic algae in water develops 'bloom'. How would it affect the environment of water?
-
The environment becomes comfortable for all forms of life.
-
O$ _2$ level is decreased or BOD becomes high.
-
O$ _2$ level of water is increased.
-
Fish production is increased.
For how long and at what temperature an experiment is run to determine the value of BOD of a water body?
-
$10^oC$ for 10 days
-
$20^oC$ for 5 days
-
$20^oC$ for 2 days
-
$5^oC$ for 20 days
BOD or biochemical oxygen demand is the amount of dissolved oxygen which is required by the aerobic organisms during the decomposition of organic matter. The BOD is measured at a specific temperature and specific period of time. BOD value is represented in the form of oxygen which is consumed per litre of the sample used for testing. The sample is tested before and after 5 days of incubation at 20 °C. The value describes the amount of organic material present in the contaminated or waste water.
Which of the following enhances B.O.D. of water ?
-
Sugar mill effluents
-
Algae
-
Sand
-
Moss
The measurement of rate of oxygen utilisation by a unit volume of water over a period of time is to measure.
-
Biochemical oxygen demand
-
Biosynthetic path
-
Biogas generation
-
Fermentation
BOD or Biochemical oxygen demand is the amount of dissolved oxygen which is required by the aerobic organisms during the decomposition of organic matter. The BOD is measured at a specific temperature and specific period of time. BOD value is represented in the form of oxygen which is consumed per litre of the sample used for testing. The sample is tested before and after 5 days of incubation at 20 °C. The value describes the amount of organic material present in the contaminated or waste water.