Evolution of different species in a given area starting from a point and spreading to other geographical areas is known as

• Adaptive radiation

• Natural selection

• Migration

• Migration

52.

What is the figure given below showing in particular?

• Ovarian cancer

• Uterine cancer

• Tubectomy

• Tubectomy

In an area where DDT had been used extensively, the population of birds declined significantly because

• birds stopped laying eggs

• earthworms in the area got eradicated

• cobras were feeding exclusively on birds

• cobras were feeding exclusively on birds

The figure below is the diagrammatic representation o the E.Coli vector pBR 322. Which one of the given options correctly identifies its certain components(s)?

• Ori- original restriction enzyme

• rop-reduced osmotic pressure

• Hind III, Eco RI-selectable markers

• Hind III, Eco RI-selectable markers

The common bottle cork is a product of

• dermatogen

• Phellogen

• Xylem

• Xylem

Widal test is carried out to test

• malaria

• diabetes mellitus

• HIV/AIDS

• HIV/AIDS

Which part would be most suitable for raising virus-free plants for micropropagation?

• Bark

• Vascular tissue

• Meristem

• Meristem

Which one of the following is a wrong statement

• Most of the forests have been lost in tropical areas

• Ozone in upper part of atmosphere is harmful to animals

• Greenhouse effect is a natural Phenomenon

• Greenhouse effect is a natural Phenomenon

Common cold differs from pneumonia in that

• pneumonia is a communicable disease whereas the common cold is a nutritional deficiency disease

• Pneumonia can be prevented by a live attenuated bacterial vaccine whereas the common cold has no effective vaccine

• Pneumonia is caused by a virus while the common cold is caused by the bacterium haemophilus influenzae

• Pneumonia is caused by a virus while the common cold is caused by the bacterium haemophilus influenzae

Removal of RNA polymerase -III from nucleoplasm will affect the synthesis of

• tRNA

• rRNA

• mRNA

• mRNA