71.

Limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial and municipal waste water into natural surface water, is:

• < 3.0 ppm

• < 10 ppm

• < 100 ppm

• < 100 ppm

Withdrawal of which of the following hormones is the immediate cause of menstruation?

• Eastrogens

• FSH

• FSH-RH

• FSH-RH

The arrangement of the nuclei in a normal embryo sac in the dicot plants is

• 2+4+2

• 3+2+3

• 2+3+3

• 2+3+3

An enzyme that can stimulate germination of barley seeds is

• α-amylase

• lipase

• protease

• protease

In a cereal grain the single cotyledon of embryo is represented by

• coleorhiza

• scutellum

• prophyll

• prophyll

Triticale, the first man-made cereal crop, has been obtained by crossing wheat with

• rye

• pearl millet

• sugarcane

• sugarcane

In order to obtain virus-free plants through tissue culture the best method is

• protoplast culture

• embryo rescue

• anther culture

• anther culture

HIV that causes AIDS, first starts destroying

• B-lymphocytes

• leucocytes

• thrombocytes

• thrombocytes

Sickle cell anaemia has not been eliminated from the African population because

• it is controlled by recessive genes

• it is not a fatal disease

• it provides immunity against malaria

• it provides immunity against malaria

Both sickle cell anaemia and Huntington's chorea are

• bacteria-related diseases

• congenital disorders

• pollutant-induced disorders

• pollutant-induced disorders