Advertisements
Advertisements
प्रश्न
Why are bio-fertilizers preferred over chemical fertilizers?
उत्तर
Biofertilizers are preferred for chemical fertilizers due to the following advantages :
(i) Decomposition products of biofertilizers help to bring mineral constituents of soil into solution.
(ii They improve physiochemical properties of soil such as cation exchange and buffering action.
(iii) They modify the physical properties like granulation of the soil and increases permeability and moisture-holding capacity of the soil.
(iv) They are economically cheaper than chemical fertilizers.
(v) Biofertilizers do not cause any harm to the environment while many chemical fertilizers are non-degradable and cause soil and water pollution.
(vi) They provide food for soil microbes and thus enhance microbial activities.
APPEARS IN
संबंधित प्रश्न
Give an example of the source of thermostable enzyme DNA polymerase.
Describe two vectors less methods of gene transfer used in rDNA technology.
Enlist and write in brief about the different biological tools required in rDNA technology.
The enzyme restriction endonuclease ______.
The gene transfer between unrelated plants is brought about by ____________.
A hind of biotechnology involving manipulation of DNA is ______.
Cloning of genes, play a very significant role in genetic engineering, helping the transfer of desirable foreign genes into different hosts. The scientists, to make this process easier and effective are creating engineered vectors in such a way that they help easy linking of foreign DNA and selection of recombinants from non-recombinants. 'pBR322' is one such engineered vectors developed by scientists. A diagram of an engineered vector pBR322 is given below:
- Name the host for this cloning vector.
- Identify 'Rop' and 'Ori' in the diagram from 'U', 'V', 'W', 'X', 'Y' and 'Z'. Write their functions.
- Draw the fragments that will be formed by the action of 'Z' (marked in the diagram) on the specific site of the DNA segment given below:
5' --- GTACGAATCCTGA --- 3'
3' --- CATGCTTAGGACT --- 3'
To be a cloning vector, a plasmid require ______.
How gene amplification is done?
Write steps involved in gene amplification.