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CBSE (Science) Class 12 - CBSE Important Questions for Biology

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Biology
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What is biopiracy?

Appears in 8 question papers
Chapter: [0.02] Biotechnology and Its Application
Concept: Ethical Issues

Give the applications of DNA fingerprinting technique.

Appears in 7 question papers
Chapter: [0.02] Molecular Basis of Inheritance
Concept: DNA Fingerprinting Technique

Represent diagrammatically three kinds of age-pyramids for human populations.

Appears in 6 question papers
Chapter: [0.01] Organisms and Populations
Concept: Population > Population Attributes

How do cytokine barriers provide innate immunity in humans?

Appears in 6 question papers
Chapter: [0.01] Human Health and Diseases
Concept: Immunity

Name two diseases whose spread can be controlled by the eradication of Aedes mosquitoes.

Appears in 6 question papers
Chapter: [0.01] Human Health and Diseases
Concept: Common Diseases in Human Beings

Name the source plant of heroin drug. How is it obtained from the plant?

Appears in 6 question papers
Chapter: [0.01] Human Health and Diseases
Concept: Drugs and Alcohol Abuse > Effects of Drug and Alcohol

Explain the mechanism of 'sex determination' in birds. How does it differ from that of human beings?

Appears in 6 question papers
Chapter: [0.01] Principles of Inheritance and Variation
Concept: Sex Determination

How has the development of bioreactor helped in biotechnology?

Appears in 6 question papers
Chapter: [0.01] Biotechnology - Principles and Processes
Concept: Process and Principles of Biotechnology

How has the development of bioreactor helped in biotechnology?

Appears in 6 question papers
Chapter: [0.01] Biotechnology - Principles and Processes
Concept: Process and Principles of Biotechnology

Name the most commonly used bioreactor and describe its working.

Appears in 6 question papers
Chapter: [0.01] Biotechnology - Principles and Processes
Concept: Process and Principles of Biotechnology

Name the most commonly used bioreactor and describe its working.

Appears in 6 question papers
Chapter: [0.01] Biotechnology - Principles and Processes
Concept: Process and Principles of Biotechnology

Explain the roles of the following with the help of an example each in recombinant DNA technology :

Restriction Enzymes

Appears in 6 question papers
Chapter: [0.01] Biotechnology - Principles and Processes
Concept: Tools of Recombinant DNA Technology > Restriction Enzymes

Explain the roles of the following with the help of an example each in recombinant DNA technology :

Plasmids

Appears in 6 question papers
Chapter: [0.01] Biotechnology - Principles and Processes
Concept: Tools of Recombinant DNA Technology > Competent Host (For Transformation with Recombinant DNA)

Differentiate between Parthenocarpy and Parthenogenesis. Give one example of each.

Appears in 6 question papers
Chapter: [0.01] Reproduction in Organisms
Concept: Types of Reproduction > Sexual Reproduction

Write the scientific name of the organism Thomas Hunt Morgan and his colleagues worked with for their experiments. Explain the correlation between linkage and recombination with respect to genes as studied by them.

Appears in 6 question papers
Chapter: [0.01] Principles of Inheritance and Variation
Concept: Linkage and Crossing Over

How did Sturtevant explain gene mapping while working with Morgan?

Appears in 6 question papers
Chapter: [0.01] Principles of Inheritance and Variation
Concept: Linkage and Crossing Over

Following are the responses of different animals to various abiotic factors. Describe each one with the help of an example.

1) Regulate

2) Conform

3) Migrate

4) Suspend

Appears in 6 question papers
Chapter: [0.01] Organisms and Populations
Concept: Organism and Its Environment > Major Abiotic Factors

Write the dual purpose served by Deoxyribonucleoside triphosphates in the polymerisation.

Appears in 6 question papers
Chapter: [0.02] Molecular Basis of Inheritance
Concept: Structure of Nucleotide

Mention the chemical change that proinsulin undergoes, to be able to act as mature insulin

Appears in 6 question papers
Chapter: [0.02] Biotechnology and Its Application
Concept: Introduction of Biotechnology and Its Application

You have obtained a high yielding variety of tomato. Name and explain the procedure that ensures retention of the desired characteristics repeatedly in large populations of future generations of the tomato crop.

Appears in 6 question papers
Chapter: [0.02] Strategies for Enhancement in Food Production
Concept: Tissue Culture
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