During waste water treatment, trickling filter is used for
primary treatment
secondary aerobic treatment
secondary anaerobic treatment
tertiary treatment
B.
secondary aerobic treatment
Trickling filter is a fixed-bed biological reactor that operates under (mostly) aerobic conditions. It is used for secondary aerobic treatment. In this system, pre-settled wastewater is continuously trickled or sprayed over the filter. As the water migrates through the pores of the filter, organics are aerobically degraded by the biofilm covering the filter material.
Relationship between DO and BOD is that they
are directly proportional
are inversely proportional
are not related
always remain equal to each other
Which one of the following hormones is responsible for uterine contraction during parturition?
Relaxin
Vasopressin
Oxytocin
Prolactin
Which one of the following information is essential to, determine the genetic map distance between two genes located on the same chromosome?
Length of the particular chromosome
Number of genes present in the particular chromosome
Number of nucleotides in the particular chromosome
Percentage of crossing over or recombinant frequency between the two genes
Phenomenon involving increase in concentration of non-degradable pollutants from lower to higher trophic levels is called
biomagnification
bioaccumulation
biodegradation
bioinvasion
During entry into the ovum, acrosome of sperm releases
hyaluronidase
alkaline phosphorylase
acid phosphatase
carbonic anhydrase
Which one of the following is a causative agent of plague?
Shigella flexner
Bordetella pertussi
Staphylococcus aureus
Yersinia pestis
What is the full form of MAB?
Man and biosphere
Man and biosphere reserve
Man and biosphere reserve programme
Man and biosphere programme
Antibodies produced by a group of identical B-cells against a single epitope of an antigen is called
polyclonal antibodies
monoclonal antibodies
anti- hapten antibodies
somaclonal antibodies
The 'Red Data Book' records
species diversity of wetlands
list of water pollutants
list of threatened species
rate of population decline
