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
A.
'A' is more recent and shows slight reduction in the growth rate
Interpretation 'A' is correct for the given figures.
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