Which insect is useful for us

• Periplaneta

•  Musca

• Bombyx

• Mosquitoes

The larvicidial fish used in biocontrol of mosquitoes

• Gambusia

• Hilsa

• Scatophagus

• Gold fish

Which group of three of the following five statements (A- E) contain is all three correct statements regarding beri- beri?

A. A crippling disease prevalent among the native population of sub- Sahara Africa.

B. A deficiency disease caused by lack of thiamine (vitamin- B₁).

C. A nutritional disorder in infants and young children when the diet is persistently deficient in essential protein.

D. Occurs in those countries where the staple diet is polished rice.

E. The symptoms are pain from neuritis, paralysis, muscle wasting, progressive oedema, mental deterioration and finally heart failure.

• A, B and D

• B, C and E

• A, C and E

• B, D and E

A patient is generally advised to specially, consume more meat, lentils, milk and eggs in diet only when he suffers from

• kwashiorkor

• rickets

• anaemia

• scurvy

Yersinia pestis is responsible for

• syphilis

• whooping cough

• plague

• leprosy

Streptomycin is obtained from

• Streptomyces griseus

• S. aureofaciens

• S. venezuelae

• S. ramosus

Schizogony occurs in 

• RBC of human

• intestine of parasite

• liver of human

• liver of parasite

AIDS is caused by HIV that principally infects

• all lymphocytes

• activator B cells

• T₄ lymphocytes

• cytotoxic T cells

Lymphocytes are formed by

• plasma cells 

•  mast cells

• liver cells

• none of these

Retrovirus have genetic material

• DNA only

• RNA only

• DNA or RNA only

• either DNA or RNA