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

Most repeated questions in exam

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Biology
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What is biopiracy?

Appears in 8 question papers
Chapter: [4.02] Biotechnology and Its Application
Concept: Ethical Issues

Give the applications of DNA fingerprinting technique.

Appears in 7 question papers
Chapter: [2.02] Molecular Basis of Inheritance
Concept: DNA Fingerprinting

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

Appears in 6 question papers
Chapter: [1.01] Reproduction in Organisms
Concept: Introduction of Sexual Reproduction

Describe any two devices in a flowering plant which prevent both autogamy and geitonogamy.

Appears in 6 question papers
Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Double Fertilisation

Medically it is advised to all young mothers that breastfeeding is the best for their newborn babies. Do you agree? Give reasons in support of your answer.

Appears in 6 question papers
Chapter: [1.03] Human Reproduction
Concept: Pregnancy and Embryonic Development

Explain menstrual cycle in human females.

Appears in 6 question papers
Chapter: [1.03] Human Reproduction
Concept: Menstrual Cycle

How can the scientific understanding of the menstrual cycle of human females help as a contraceptive measure?

Appears in 6 question papers
Chapter: [1.03] Human Reproduction
Concept: Menstrual Cycle

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

Appears in 6 question papers
Chapter: [2.01] Principles of Inheritance and Variation
Concept: Sex Determination - Introduction of Sex Determination

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: [2.01] Principles of Inheritance and Variation
Concept: Inheritance of Two Genes - Linkage and Crossing Over

How did Sturtevant explain gene mapping while working with Morgan?

Appears in 6 question papers
Chapter: [2.01] Principles of Inheritance and Variation
Concept: Inheritance of Two Genes - Linkage and Crossing Over

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

Appears in 6 question papers
Chapter: [2.02] Molecular Basis of Inheritance
Concept: Structure of Nucleotide

Expand VNTR and describe its role in DNA fingerprinting.

Appears in 6 question papers
Chapter: [2.02] Molecular Basis of Inheritance
Concept: DNA Fingerprinting

State the 'Central dogma' as proposed by Francis Crick. Are there any exceptions to it? Support your answer with a reason and an example.

Appears in 6 question papers
Chapter: [2.02] Molecular Basis of Inheritance
Concept: Search for Genetic Material - Introduction of Search for Genetic Material

Explain how the biochemical characterisation (nature) of 'Transforming Principle' was determined, which was not defined from Griffth's experiments.

Appears in 6 question papers
Chapter: [2.02] Molecular Basis of Inheritance
Concept: Search for Genetic Material - Introduction of Search for Genetic Material

Write the names of the following:

A 15 mya primate that was ape-like

Appears in 6 question papers
Chapter: [2.03] Evolution
Concept: Origin and Evolution of Man

Write the names of the following:

A 2 mya primate that lived in East African grasslands

Appears in 6 question papers
Chapter: [2.03] Evolution
Concept: Origin and Evolution of Man

With the help of an algebraic equation, how did Hardy-Weinberg explain that in a given population the frequency of occurrence of alleles of a gene is supposed to remain the same through generations?

Appears in 6 question papers
Chapter: [2.03] Evolution
Concept: Hardy - Weinberg'S Principle

Differentiate between analogous and homologous structures.

Appears in 6 question papers
Chapter: [2.03] Evolution
Concept: Evidences for Evolution

How do cytokine barriers provide innate immunity in humans?

Appears in 6 question papers
Chapter: [3.01] Human Health and Diseases
Concept: Concept of Immunity

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

Appears in 6 question papers
Chapter: [3.01] Human Health and Diseases
Concept: Common Diseases in Humans
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Important Questions for CBSE (Science) Class 12 CBSE Biology. You can further filter Question Bank Solutions by subjects and chapters. Chapter wise important Questions for Class 12 CBSE. it gets easy to find all Class 12 important questions with answers in a single place for students. Saving time and can then focus on their studies and practice. Important questions for Class 12 chapter wise with solutions
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