Which one of the following is a causative agent of plague?

• Shigella flexner

• Bordetella pertussi

• Staphylococcus aureus

• Yersinia pestis

Which one of the following hormones is responsible for uterine contraction during parturition?

• Relaxin

• Vasopressin

• Oxytocin

• Prolactin

73.

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

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

During waste water treatment, trickling filter  is used for

• primary treatment

• secondary aerobic treatment

• secondary anaerobic treatment

• tertiary treatment

Relationship between DO and BOD is that they

• are directly proportional

• are inversely proportional

• are not related

• always remain equal to each other

What is the full form of MAB?

• Man and biosphere

• Man and biosphere reserve

• Man and biosphere reserve programme

• Man and biosphere programme

The 'Red Data Book' records

• species diversity of wetlands

• list of water pollutants

• list of threatened species

• rate of population decline