Water Pollution and Its Control

Study the graph given below and choose the option that is correctly describing the relationship between dissolved oxygen (DO) and biochemical oxygen demand (BOD):

A factory drains its waste water into the nearby lake. It has caused algal bloom. The phenomenon responsible for its cause is:

Drinking mineral water with very low level of pesticides (0.02ppm) for long periods may

Biological Oxygen Demand (BOD) is a measure of

Which of the following is biodegradable pollutant?

Fluoride pollution mainly affects

Which of the following is called the ‘Terror of Bengal’

Read the following statements and select the correct option from below:

I. Genetically modified crops are more susceptible to natural stress conditions like drought, salinity, etc., as compared to normal crops

II. For the treatment of ADA (adenosine deaminase) deficiency treatment, a functional ADA cDNA was introduced to the lymphocytes of the patient by using lambda phage virus

III. There are more than 3,00,000 rice varieties in India alone

IV. Nitrates, phosphates are easily removed from polluted water in the water treatment plant.

Government of India has passed Water (Prevention and Control of Pollution) Act, in

Black foot disease is due to

In a polluted lake

Eco-sanitation is

Prime contaminants leading to cultural or accelerated eutrophication are

Match the column

The graph given below shows changes in the different ecological parameters due to mixing of effluent in a stream. The three lines $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ represent:

In an area DDT had been used extensively. The population of birds declined significantly because