PUC Science 2nd PUC Class 12 - Karnataka Board PUC Question Bank Solutions for Biology

Prepare a flow chart in formation of recombinant DNA by the action of restriction endonuclease enzyme EcoRI.

Name the animals in which methanogens occur and the role they play there.

What is the mechanism by which the AIDS virus causes deficiency of immune system of the infected person?

What precaution(s) would you recommend to a patient requiring repeated blood transfusion? 

If the advise is not followed by the patient, there is an apprehension that the patient might contract a disease that would destroy the immune system of his/her body. Explain with the help of schematic diagram only how the immune system would get affected and destroyed.

'in-situ' Conservation can help endangered/threatened species. Justify the statement.

Name and describe any three causes of bio-diversity losses.

Construct a pyramid of numbers by taking suitable examples for each trophic level in an ecosystem.

Explain why a progressive decline is seen in the population size from the first to the fourth trophic level in the above pyramid.

Many copies of a specific gene of interest are required to study the detailed sequencing of bases in it. Name and explain the process that can help in developing large number of copies of this gene of interest.

There are many animals that have become extinct in the wild but continue to be maintained in Zoological parks.
(i) What type of biodiversity conservation is observed in this case?
(ii) Explain any other two ways which help in this type of conservation.

In an agricultural field there is a prevalence of the following organisms and crop diseases which are affecting the crop yield badly:
(a) White rust
(b) Leaf and stripe rust
(c) Black rot
(d) Jussids

Recommend the varieties of crops the farmers should grow to get rid of the existing problem and thus improve the crop yiel.

How does the application of the fungal genus, Glomus, to the agricultural farm increase the farm output? 

What is an age-pyramid?

How does the application of cyanobacteria help improve agricultural output?

State the initiative taken by the Indian Parliament against bio-piracy?

What is the mechanism by which the AIDS virus causes deficiency of immune system of the infected person?

p² + 2pq + q² = 1. Explain this algebraic equation on the basis of Hardy Weinberg's principle.

What precaution(s) would you recommend to a patient requiring repeated blood transfusion? 

If the advise is not followed by the patient, there is an apprehension that the patient might contract a disease that would destroy the immune system of his/her body. Explain with the help of schematic diagram only how the immune system would get affected and destroyed.