During secondary treatment of the primary effluent how does the significant decrease in BOD occurs?

During the secondary treatment of the primary effuent how does the significant decrease in BOD occur

During muscle contraction which of the following does not occurs ?

What are 'flocs', formed during secondary treatment of sewage ? OR Write any two places where methanogens can be found.

How does chemical coordination occur in plants?

During the primary treatment of sewage, solid paricles that settle down are called

Which of the following does not occur in response to decrease in blood volume?

What are primary cells? How does a dry cell function?

How does the process of regeneration occur in Hydra?

How does the process of regeneration occur in Hydra?

Read the following statements w.r.t. biological treatment of sewage. Br a. Involves removal of sewage through sequential filteration. Br b. BOD of waste water is directly proportional to its a polluting potential. Br c. Constant agitation of primary effluent is carried out in large aeration tanks. Identify the incorrect statement(s)