Science (English Medium) 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: [0.1] Biotechnology and Its Application
Concept: Ethical Issues

Give the applications of DNA fingerprinting technique.

Appears in 7 question papers
Chapter: [0.05] Molecular Basis of Inheritance
Concept: DNA Fingerprinting Technique

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

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

Appears in 6 question papers
Chapter: [0.01] Sexual Reproduction in Flowering Plants
Concept: Double Fertilization and Triple Fusion in Plant

Draw a diagram of the microscopic structure of human sperm. Label the following parts in it and write their functions

(a) Acrosome

(b) Nucleus

(c) Middle piece

Appears in 6 question papers
Chapter: [0.02] Human Reproduction
Concept: Gametogenesis

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: [0.02] Human Reproduction
Concept: Pregnancy and Embryonic Development

Explain menstrual cycle in human females.

Appears in 6 question papers
Chapter: [0.02] Human Reproduction
Concept: Menstrual Cycle (Ovarian Cycle)

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

Appears in 6 question papers
Chapter: [0.02] Human Reproduction
Concept: Menstrual Cycle (Ovarian Cycle)

How did a citizen group called Friends of Arcata Marsh Arcata, California, USA, help to improve the water quality of the marshland using Integrated Waste Water Treatment? Explain in four steps.

Appears in 6 question papers
Chapter: [0.04] Environmental Issues
Concept: A Case Study of Integrated Waste Water Treatment

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

Appears in 6 question papers
Chapter: [0.04] Principles of Inheritance and Variation
Concept: Sex Determination

Looking at the deteriorating air quality because of air pollution in many cities of the country, the citizens are very much worried and concerned about their health. The doctors have declared the health emergency in the cities where the air quality is very severely poor.

1) Mention any two major causes of air pollution.

2) Write any two harmful effects of air pollution to plants and humans.

3) As a captain of your school Eco-club, suggest any two programmes you would plan to organise in the school so as to bring awareness among the students on how to check air pollution in and around the school.

 

Appears in 6 question papers
Chapter: [0.04] Environmental Issues
Concept: Prevention of Air Pollution

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: [0.04] 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: [0.04] Principles of Inheritance and Variation
Concept: Linkage and Crossing Over

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

Appears in 6 question papers
Chapter: [0.05] Molecular Basis of Inheritance
Concept: Structure of Nucleotide

Expand VNTR and describe its role in DNA fingerprinting.

Appears in 6 question papers
Chapter: [0.05] Molecular Basis of Inheritance
Concept: DNA Fingerprinting Technique

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: [0.05] 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: [0.05] 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: [0.06] 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: [0.06] 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: [0.06] Evolution
Concept: Hardy Weinberg’s Principle
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