Which of the following statement is correct about DDT
It is a biomagnifying biodegradable pollutant
It is non biomagnifying biodegradable pollutant
It is biomagnifying non biodegradable pollutant
It is not a pollutant
C.
It is biomagnifying non biodegradable pollutant
DDT has been recently banned because it is non-biodegradable and biomagnifying pollutant. Biomagnification means the increase in amount of DDT in the body of organism along with the increase in trophic level. Hence, the amount of DDT in 1st trophic level will be minimum and in top consumer will be maximum.
DNA polymerase enzyme is required for synthesis of
DNA from RNA
RNA from DNA
DNA from DNA
RNA from RNA
Micro-organism which act as a vehicle for foreign gene transfer in higher plants
Agrobacterium
E. coli
T.M.V.
Bacillus anihracis
Restriction enzymes are used in genetic engineering, because they
can degrade harmful proteins
can join different DNA fragments
can cut DNA at specific base sequence
are nucleases that cut DNA at variable sites
Which type of DNA is found in bacteria
Helical DNA
Membrane bound DNA
Straight DNA
Circular free DNA
Double fertilization means
fusion of nucleus of male gamete with the egg nucleus
fusion of two polar nuclei
fusion of sperm nucleus with secondary nucleus
fusion of one sperm nucleus with nucleus and fusion of other sperm nucleus with secondary nucleus
Which is social foresting species
Leucaena leucocephala
Tectona grandis
Mangifera indica
Rosa indica
