81.

DDT residues are rapidly passed through food chain causing biomagnification because DDT is 

• liposoluble

• moderately toxic

• non-toxic to aquatic animals

• non-toxic to aquatic animals

Montreal protocol aims at

• reduction of ozone depleting substances

• biodiversity conservation

• control of water pollution

• control of water pollution

Given below is a diagrammatic sketch of a portion of the human male reproductive system. Select the correct set of the names of the parts labelled A, B, C, D.

• A	B	C	D
  Ureter	Prostate	Seminal  Vesicle	Bulbourethral gland

• A	B	C	D
  Vas deferens	Seminal vesicle	Prostate	Bulbourethral gland

• A	B	C	D
  Vas deferens	Seminal vesicle	Bulbourethral gland	Prostate

• A	B	C	D
  Vas deferens	Seminal vesicle	Bulbourethral gland	Prostate

A country with a high rate of population growth took measures to reduce it. The figure below shows age-sex pyramids of populations. A and B twenty years apart. Select the correct interpretation about them



Interpretations

• 'A' is more recent and shows slight reduction in the growth rate

• 'B' is earlier pyramid and shows stabilised

• 'B' is more recent showing that population is very young

• 'B' is more recent showing that population is very young

The correct sequence of spermatogenetic stages leading to the formation of sperms in mature human testis is

• spermatocyte-spermatoogonia-spermatid-sperms

• spermatogonia-spermatocyte-spermatid

• spermatid-spermatocyte-spermatogonia-sperms,

• spermatid-spermatocyte-spermatogonia-sperms,

Steps taken by the Government of India to control air pollution include

• compulsory mixing of 20% ethyl alcohol with petrol and 20% biodiesel with diesel

• Compulsory PUC (pollution Under control) certification of petrol driven vehicles, which tests for carbon monoxide and hydrocarbons

• permission to use only pure diesel with a maximum of 500 ppm sulphur as fuel for vehicles

• permission to use only pure diesel with a maximum of 500 ppm sulphur as fuel for vehicles

Cotyledons and testa are edible parts of 

• groundnut and pomegranate

• walnut and tamarind

• french bean and coconut

• french bean and coconut

Polyethylene glycol method is used for

• gene transfer without a vector

• biodiesel production

• seedless fruit production

• seedless fruit production

Which one of the following pairs is wrongly matched?

• Detergents -Lipase

• Alcohol- Nitrogenase

• Fruit juice - pectinase

• Fruit juice - pectinase

A person likely to develop tetanus is immunised by administering

• dead germs

• preformed antibodies

• wide spectrum antibiotics

• wide spectrum antibiotics