The most abundant prokaryotes helpful to human in making curd from milk and in production of antibiotics are the ones categorized as:

1. Cyanobacteria

2. Archaebacteria

3. Chemosynthetic autotrophs

4. Heterotrophic bacteria

Which one of the following statements is false in respect of viability of mammalian sperm?

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

1. Adaptive radiation

2. Natural selection

3. Migration

4. Divergent evolution

What is the figure given below showing in particular? 

1. Ovarian cancer

2. Uterine cancer

3. Tubectomy

4. Vasectomy

In an area where DDT had been used extensively, the population of birds declined significantly because:
1. Birds stopped laying eggs
2. Earthworms in the area got eradicated
3. Cobras were feeding exclusively on birds
4. Many of the birds laid eggs, but the eggs did not hatch

The figure below is the diagrammatic representation of the E.coli vector pBR 322. Which one of the given options correctly identifies its certain components (s)? 
 
1. Ori-original restriction enzyme

2. Rop-reduced osmotic pressure

3. Hind III, Eco RI-selectable markers

4. Amp^R, teti^R-antibiotic resistance genes

The common bottle cork is a product of:

1. dermatogen

2. phellogen

3. xylem

4. vascular cambium

Widal test is carried out to test:

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

1. Bark

2. Vascular tissue

3. Meristem

4. Node

Which one of the following is a wrong statement?