C:-Both 1 and 2 horizon

D:-C-horizon

Correct Answer:- Option-C
Question48:-The molecules can be resolved on the basis of their distribution between a gas and either a solid or liquid by
separation method known as

A:-Gas chromatography
B:-HPLC
C:-Filtration
D:-Centrifugation
Correct Answer:- Option-A
Question49:-Which of the following methods ‏کا‎ used to determine large number of inorganic ions and organic compounds 7
A:-Filtration
B:-Gravimetry
C:-Titrimetry
D:-Colorimetry
Correct Answer:- Option-D
Question50:-The standard method for the analysis of higher levels of CO in air sample is
A:-IR spectrophotometry
B:-Gas chromatography
C:-Chemiluminescence
D:-UV spectrophotometry
Correct Answer:- Option-A
Question51:-The standard method for the analysis of a low levels of ammonia in water sample is
A:-Titration
B:-Gravimetry
C:-Potentiometry
D:-Spectrophotometry
Correct Answer:- Option-D
Question52:-The warmer, upper layer of water in a lake is called the
A:-Thermocline
B:-Epilimnion
C:-Hypolimnion
D:-Neritic zone
Correct Answer:- Option-B
Question53:-Among the ecological pyramids, which pyramid always show upright imespective of the grassland or pond
ecosystem
A:-Pyramid of energy
B:-Pyramid of number
C:-Pyramid of biomass
D:-Pyramid of succession
Correct Answer:- Option-A
Question54:-Formation of a climax community from an abandoned farm land is an example of
A:-Primary succession
B:-Secondary succession
C:-Autogenic succession
D:-Allogenic succession
Correct Answer:- Option-B
Question55:-What type of organisms are the primary producers in the deep-sea 7
A:-photosynthetic bacteria
B:-chemosynthetic bacteria
C:-crabs and fish
D:-worms
Correct Answer:- Option-B
Question56:-The grassland ecosystem of Africa is known as
A:-Savannas
B:-Prairies
C:-Steppes
D:-Pumpas
Correct Answer:- Option-A