Biology Important
Question & Answers

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Molecular Basis of Inheritance

Describe the structure of double helix model of DNA. DNA is made up of two polynucleotide chains, where the backbone is made up of sugar and phosphate groups

Molecular Basis of Inheritance

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Principles of Inheritance and Variation

What is linkage and recombination? Linkage- The physical Association of two genes on a chromosome is termed as linkage.

Principles of Inheritance and Variation

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Reproductive Health

What is amniocentesis? A foetal sex-determination test based on the chromosome pattern in the cells found in amniotic fluid surrounding the developing embryo is called amniocentesis.

Reproductive Health

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Human Reproduction

What is placenta. Mention the functions of placenta. A structural and functional unit present between developing embryo (foetus) and maternal body is called placenta.

Human Reproduction

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Sexual Reproduction in Flowering Plants

What is apomixis and polyembryony? The phenomenon of asexual reproduction that imitates sexual reproduction by the formation of seed without fertilization is called apomixis or agamospermy.

Sexual Reproduction in Flowering Plants

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Reproduction in Organisms

What is parthenogenesis? The phenomenon of development of female gamete directly into an individual without
fertilization is called parthenogenesis.

Reproduction in Organisms

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Evolution

Hardy-Weinberg principle states that allelic frequencies in a population are stable and remains constant from generation to generation, i.e., gene pool (total number of genes and their alleles in a population) is constant.

Evolution

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Human Health and Diseases

What is an allergy? The exaggerated response of the immune system to certain antigens present in the environment is called allergy.

Human Health and Diseases

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Strategies for Enhancement in Food Production

What is an explant? The part of the plant taken for tissue culture is called explant.

Strategies for Enhancement in Food Production

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Microbes in Human Welfare

Discuss the role of Microbes as biofertilizers. Rhizobium is a symbiotic bacterium that lives in the root nodules of legumes and fixes atmospheric nitrogen into organic compounds.

Microbes in Human Welfare

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Biotechnology: Principles and Processes

What is elution? The separated bands of DNA are cut out and extracted from the gel piece. This step is called elution.

Biotechnology: Principles and Processes

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Biotechnology and its applications

What are genetically modified organisms? Genetically modified organisms (GMOs) are plants, bacteria, fungi and animals whose genes have been altered by manipulation.

Biotechnology and its applications

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Organisms and Populations

What is Homeostasis? The ability of an organism to maintain the constancy of its internal environment despite varying external environmental conditions.

Organisms and Populations

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Ecosystem

What is an ecological succession? The sequential, gradual and predictable changes in the species composition in an area are called succession or ecological succession.

Ecosystem

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Biodiversity and Conservation

What is endemism? Endemism is the state of a species being native to a single defined geographic location.

Biodiversity and Conservation

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Environmental Issues

What is Montreal protocol? Montreal Protocol is an international treaty, was signed at Montreal, Canada, in 1987 to curb the emission of ozone depleting substances.

Environmental Issues