Phenomenon involving increase in concentration of non-degradable pollutants from lower to higher trophic levels is called
biomagnification
bioaccumulation
biodegradation
bioinvasion
A.
biomagnification
Biomagnification is the increase in concentration of the toxicant at successive trophic level. It happens because a toxic substance accumulated by on organism cannot be metabolised or excreted and is thus passed on to the next higher trophic level.
Bioaccumulation refers to the accumulation of substances such as pesticides or other chemicals in an organism.
Biodegradation is the chemical dissolution of organic matter by bacteria, fungi or other biological means into nutrients that can be used by other organisms.
Bioinvasion is the rapid expansion of a species into regions where it had not previously existed, often as a result of human agency.
During waste water treatment, trickling filter is used for
primary treatment
secondary aerobic treatment
secondary anaerobic treatment
tertiary treatment
During entry into the ovum, acrosome of sperm releases
hyaluronidase
alkaline phosphorylase
acid phosphatase
carbonic anhydrase
Which one of the following hormones is responsible for uterine contraction during parturition?
Relaxin
Vasopressin
Oxytocin
Prolactin
What is the full form of MAB?
Man and biosphere
Man and biosphere reserve
Man and biosphere reserve programme
Man and biosphere programme
Relationship between DO and BOD is that they
are directly proportional
are inversely proportional
are not related
always remain equal to each other
The 'Red Data Book' records
species diversity of wetlands
list of water pollutants
list of threatened species
rate of population decline
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
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
Which one of the following is a causative agent of plague?
Shigella flexner
Bordetella pertussi
Staphylococcus aureus
Yersinia pestis
