PUC Karnataka Science Class 12Department of Pre-University Education, Karnataka
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Question Bank Solutions for PUC Karnataka Science Class 12 - Department of Pre-University Education, Karnataka

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Explain the role of Restriction endonuclease in Biotechnology

[4.02] Biotechnology and Its Application
Chapter: [4.02] Biotechnology and Its Application
Concept: Introduction of Biotechnology and Its Application
Appears in 3 question papers

Explain the role of the Gel − electrophoresis in Biotechnology

[4.02] Biotechnology and Its Application
Chapter: [4.02] Biotechnology and Its Application
Concept: Introduction of Biotechnology and Its Application
Appears in 3 question papers

Explain the role of the Selectable markers in pBR322 in Biotechnology.

[4.02] Biotechnology and Its Application
Chapter: [4.02] Biotechnology and Its Application
Concept: Introduction of Biotechnology and Its Application
Appears in 3 question papers

By taking two examples explain how has bio-fortification helped in improving food quality.

[3.02] Strategies for Enhancement in Food Production
Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Introduction of Strategies for Enhancement in Food Production
Appears in 1 question paper

Bottled fruit juices are clearer as compared to those made at home. Explain.

 

 
[3.02] Strategies for Enhancement in Food Production
Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Introduction of Strategies for Enhancement in Food Production
Appears in 1 question paper

Name and explain the technique used for separating DNA fragments and making them available for biotechnology experiments.

[4.01] Biotechnology - Principles and Processes
Chapter: [4.01] Biotechnology - Principles and Processes
Concept: Principles of Biotechnology
Appears in 1 question paper

What is mycoherbicide?

[4.02] Biotechnology and Its Application
Chapter: [4.02] Biotechnology and Its Application
Concept: Biotechnological Applications in Agriculture
Appears in 1 question paper

Our government has intentionally imposed strict conditions for M.T.P. in our country. Justify giving a reason.

[1.04] Reproductive Health
Chapter: [1.04] Reproductive Health
Concept: Reproductive Health - Problems and Strategies
Appears in 3 question papers

List the three states the annuals and biennial angiosperms have to pass through during their life cycle.

[1.02] Sexual Reproduction in Flowering Plants
Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Flower – a Fascinating Organ of Angiosperms
Appears in 1 question paper

What is inbreeding depression?

[3.02] Strategies for Enhancement in Food Production
Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Animal Husbandry
Appears in 2 question papers

Explain the importance of "selection" during inbreeding in cattle

[3.02] Strategies for Enhancement in Food Production
Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Animal Husbandry
Appears in 3 question papers

Why do lepidopterans die when they feed on Bt cotton plant? Explain how does it happen.

[4.02] Biotechnology and Its Application
Chapter: [4.02] Biotechnology and Its Application
Concept: Biotechnological Applications in Agriculture
Appears in 3 question papers

In a flowering plant a microspore mother cell produces four male gametophytes while a megapore mother cell forms only one female gametophyte. Explain

[1.02] Sexual Reproduction in Flowering Plants
Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Flower – a Fascinating Organ of Angiosperms
Appears in 1 question paper

Read the statement and answer the questions that follow.

A flower of brinjal has 520 ovules in its ovary. However, it produces a fruit with only 480 viable seeds.

(a) What could have prevented the rest of the 40 ovules from maturing into viable seeds? Explain giving a reason.

(b) Describe the development of a dicot embryo in a viable seed.

(c) Why certain angiospermic seed albuminous while others are exalbuminous? Explain.

[1.02] Sexual Reproduction in Flowering Plants
Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Flower – a Fascinating Organ of Angiosperms
Appears in 1 question paper

Rearrange the human activities mentioned below as per the order in which they developed after the modern Homo sapiens came into existence during ice age:

(i) Human settlement
(ii) Prehistoric cave art
(iii) Agriculture

[2.03] Evolution
Chapter: [2.03] Evolution
Concept: Origin of Life
Appears in 1 question paper

Show with the help of a flow chart only, the life cycle of malarial parasite in humans.

[3.01] Human Health and Diseases
Chapter: [3.01] Human Health and Diseases
Concept: Common Diseases in Humans
Appears in 1 question paper

A capsicum flower has 240 ovules in its ovary. But, it produces a fruit with only 180 viable seeds.
 

Explain giving a reason that could be responsible for such a result.
[1.02] Sexual Reproduction in Flowering Plants
Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Flower – a Fascinating Organ of Angiosperms
Appears in 1 question paper

Name the kind of diseases/disorders that are likely to occur in humans if
    (i) mutation in the gene that codes for an enzyme phenyl alanine hydrolase occurs,
    (ii) there is an extra copy of chromosome 21,
    (iii) the karyotype is XXY.

[1.04] Reproductive Health
Chapter: [1.04] Reproductive Health
Concept: Reproductive Health - Problems and Strategies
Appears in 1 question paper

Mention any one symptom of the diseases/disorders named above.

 

 
[1.04] Reproductive Health
Chapter: [1.04] Reproductive Health
Concept: Reproductive Health - Problems and Strategies
Appears in 1 question paper

(a) State and explain the law of dominance as proposed by Mendel.
(b) How would phenotypes of monohybrid F1 and F2 progeny showing incomplete dominance in Snapdragon and co-dominance in human blood group be different from Mendelian monohybrid F1 and F2 progeny? Explain.

[2.01] Principles of Inheritance and Variation
Chapter: [2.01] Principles of Inheritance and Variation
Concept: Mendel’s Laws of Inheritance
Appears in 1 question paper
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