CBSE 12th Standard Biology Subject Biotechnology: Principles and Processes Value Based Questions 5 Marks Questions With Solution 2021
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CBSE 12th Standard Biology Subject Biotechnology: Principles and Processes Value Based Questions 5 Marks Questions With Solution 2021
12th Standard CBSE
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Reg.No. :
Biology
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Suresh thought of straight export of orchids as these flowers fetch high price in international market due to their beauty and longer vase life. He consulted his Botanist uncle who suggested him a fast method of propagation of orchids to earn good profits.
Read the above passage and answer the following questions:
(i) What is plant tissue culture ?
(ii) What is micropropagation ?
(iii) What value is displayed by Suresh's uncle ?(a) -
Hari was a grower. He used to grow tomatoes on his fertile land and got very good yields. Science the vegetable market was far from his village and also he had no transport facility, most of his harvest was rotten due to delay. He consulted his friend in a agriculture university for solution to this problem who suggested him to grow transgenic tomatoes with delayed ripening genes.
Read the above passage and answer the following questions:
(i) What are transgenics?
(ii) How are transgenic tomato produced?
What value was displayed by Hari's friend?(a) -
Rahul introduced Ronit to his uncle and told him that Ronit is pursuing course in biotechnology in America.
His uncle had never of this term earlier and was curious to know about this term. Ronit pointed towards a big tree at the base of which were present numerous tumour-like structures and said that this is the example of natural biotechnology.
(i) What is biotechnology?
(ii) How these crown gall tumours are formed?
(iii) What are the value shown by Rahul's uncle?(a) -
The biology teacher was explaining about restriction enzymes and came to a point explaining that these enzymes are extracted from bacteria and are called as molecular scissors. Varun, a student got curious and asked some questions for more clarity on the concept to his teacher.
(i) From which part of microorganisms are restriction enzymes derived?
(ii) Why are restriction enzymes called molecular scissors?
(iii) What if some strands are needed to be cut from within. would that lead to wastage of DNA?
(iv) What value are shown by varun?(a) -
No evidence was found on a crime scene, other than only a few hair strands. The inspector wants to proceed for DNA fingerprinting but the amount of DNA is very less.
(i) In your opinion what could be the solution to this problem?
(ii) Write the basic steps of this technique.
(iii) Name the scientist who developed this technique.
(iv) What values show by the inspector?(a)
5 Marks
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CBSE 12th Standard Biology Subject Biotechnology: Principles and Processes Value Based Questions 5 Marks Questions With Solution 2021 Answer Keys
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(i) It is the technique of growing cell, tissue, organ or whole plant under controlled conditions.
(ii) Micropropagation is the technique of producing a large number of identical plants from small explant within a short period using tissue culture technique.
(iii) His uncle, being a Botanist, guided his nephew to adopt modern biotechnology techniques so that he could earn handsome profits. -
(i) These are the organisms which contain functional foreign genes.
(ii) These are produced by experimentally introduced gene into their genome by genetic engineering from another species.
(iii) Hari's friend helped him by advising him transgenic crop having delayed ripening property. -
(i) Biotechnology deals with the techniques of using live organisms or enzymes from organisms to produce products and processes useful to human.
(ii) These are formed by integration of a segment of DNA of the bacterium Agrobacterium tumifacients into the host DNA.
(iii) Rahul's uncle has a positive desire to know about latest discoveries and developments in the field of science. -
(i) Restriction enzymes are derived from a defence unit called restriction modification system which protects the microorganisms from harm.
(ii) They are called as molecular scissors because they cut DNA molecules at specified location indicated by presence of specific recognition sequence.
(iii) No, the strands cut from within are joined by another enzyme called DNA ligase. This joining is either with self or with another different strand.
(iv) Varun is curious, has scientific temperament and ask quick and intelligent questions. -
(i) Amplification of gene of interest using PCR is required.
(ii) Denaturation, annealing and extension are the basic steps of PCR.
(iii) Kary Mullis developed PCR in 1985
(iv) Honesty and sense of responsibility towards his duty.
5 Marks
