Montreal Protocol which calls for appropriate action to protect the ozone layer from human activities was passed in the year:
1986
1987
1988
1985
About 70% of total global carbon is found in:
Grasslands
Agro ecosystems
Oceans
Forests
In which one of the following, the BOD (Biochemical Oxygen Demand) of Sewage (S), Distillery Effluent (DE), Paper mill Effluent ( PE) and Sugar mill Effluent (SE) have been arranged in ascending order ?
SE< S < PE < DE
SE < PE < S < DE
PE < S < SE < DE
S < DE < PE < SE
Photochemical smog pollution does not contain:
Ozone
Nitrogen dioxide
Carbon dioxide
PAN (Peroxy Acyl Nitrate )
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
< 30ppm
The response of different organisms to the environmental rhythms of light and darkness is called
phototaxis
phototropism
vernalization
photoperiodism
Which type of association is found in between entamophilous flower and pollinating agent ?
Mutualism
Commensalism
Cooperation
Co-evolution
The table below gives the populations ( in thousands ) of ten species ( A - J ) in four areas ( a - d ) consisting of the number of habitats given within brackets against each . Study the table and answer the question which follows .
Area and
number of habitats
Species and their populations
(in thousands ) in the areas
s (11)
b (11)
c (13 )
d (12 )
2.3
10.2
11.3
3.2
1.2
---
0.9
o.52
0.62
0.48
11.1
6.0
2.4
4.8
1.5
1.4
0.4
3.1
3.0
4.2
3.3
1.1
0.8
9.0
8.2
8.4
7.3
----
2.2
10.3
11.2
4.1
2.1
Which area show a maximum species diversity ?
b
c
d
a
Two different species cannot live for long duration in the same niche or habitat. This law is:
Allen's law
Mendel's law
Gause's competitive exclusion principal
Weismann's theory
The supersonic jets cause pollution by the thinning of
CO2layer
SO2 layer
O2 layer
O3 layer
