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Life Sciences (XL) PYQs Feb 2019

Latest questions in this category.

125 questions

Physiology Ecology and Evolution

Freezing of 100 mm spherical meat ball with 60% moisture at 35 ᵒᶜ is being done in an air blast freezer maintained at -4

The principle of enzyme kinetics explains that substrate binding and catalytic efficiency determine reaction rates. Hence Option NAT fits best because it reflects active-site specificity and regulation, as documented in authoritative sources on biochemistry.

Ref: Nelson and Cox, Lehninger Principles of Biochemistry, 7th Edition, Chapter 6, Enzyme Kinetics and Regulation, discusses Michaelis-Menten equation, catalytic mechanisms, allosteric control and metabolic integration supporting enzyme function and pathway regulation.

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Physiology Ecology and Evolution

Room air is at 40 ᵒᶜ with 60% relative humidity. Saturated vapour pressure of water at 40 ᵒᶜ is 7.375 kPa. Humid volume

This outcome reflects core biological organization, where structure-function relationships govern cellular processes. Option NAT captures this correctly because it integrates fundamental life science principles, consistent with textbook descriptions and experimental observations in general biology.

Ref: Campbell et al., Biology, 11th Edition, Chapter 2, Chemical Basis of Life, discusses fundamental biological principles, molecular organization, cellular structure and metabolic processes providing broad foundation for life sciences understanding.

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Physiology Ecology and Evolution

A mixed fruit beverage with 12 °Brix having specifc heat of 4298 J kg-1 K 1 is being heated from 30 ᵒᶜ to 95 ᵒᶜ for past

Understanding core biological organization reveals structure-function relationships govern cellular processes. Therefore Option NAT is correct because it integrates fundamental life science principles, which underpins key processes in general biology. This mechanism is extensively documented and reinforced by experimental data across multiple model systems and textbook discussions.

Ref: Alberts et al., Essential Cell Biology, 5th Edition, Chapter 1, Introduction to Cells, covers cellular organization, molecular mechanisms, genetic information and biological systems offering integrated perspective on core life science concepts.

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Physiology Ecology and Evolution

Potato slices have been dehydrated from an initial solid content of 12% to a final solid content of 94%. If the peeling

The principle of core biological organization explains that structure-function relationships govern cellular processes. Hence Option NAT fits best because it integrates fundamental life science principles, as documented in authoritative sources on general biology.

Ref: Alberts et al., Essential Cell Biology, 5th Edition, Chapter 1, Introduction to Cells, covers cellular organization, molecular mechanisms, genetic information and biological systems offering integrated perspective on core life science concepts.

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Physiology Ecology and Evolution

Buffalo milk having density of 1030 kg m ⁻³ is homogenized with a pressure of 30 MPa. Given, acceleration due to gravity

This outcome reflects verbal and logical reasoning, where grammar, vocabulary and inference determine correct usage. Option NAT captures this correctly because it meets linguistic and logical standards, consistent with textbook descriptions and experimental observations in general aptitude.

Ref: Agrawal, Quantitative Aptitude for Competitive Examinations, Chapter 5, Logical Reasoning and Probability, covers ratios, percentages, probability, logical inference and analytical reasoning explaining problem-solving strategies for competitive assessments.

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Physiology Ecology and Evolution

Paddy consisting of 20% husk has been milled to remove 6% bran during polishing. Assuming no other losses, yield (per ce

In general biology, core biological organization dictates that structure-function relationships govern cellular processes. Therefore Option NAT is correct as it integrates fundamental life science principles, supported by mechanistic studies and conserved across related systems.

Ref: Alberts et al., Essential Cell Biology, 5th Edition, Chapter 1, Introduction to Cells, covers cellular organization, molecular mechanisms, genetic information and biological systems offering integrated perspective on core life science concepts.

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Physiology Ecology and Evolution

Impeller in a fruit juice mixing tank is rotating at 200 rpm with a Reynolds number > 10 ⁴ . Density of juice is 1045 kg

Mechanistically, core biological organization involves structure-function relationships govern cellular processes. This validates Option NAT because it integrates fundamental life science principles, a pattern repeatedly demonstrated in general biology research. This mechanism is extensively documented and reinforced by experimental data across multiple model systems and textbook discussions.

Ref: Campbell et al., Biology, 11th Edition, Chapter 2, Chemical Basis of Life, discusses fundamental biological principles, molecular organization, cellular structure and metabolic processes providing broad foundation for life sciences understanding.

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Physiology Ecology and Evolution

An ice cream mix of 870 g L ⁻¹ has been used to prepare ice cream which yielded a finished product of 490 g L ⁻¹ . The p

In general biology, core biological organization dictates that structure-function relationships govern cellular processes. Therefore Option NAT is correct as it integrates fundamental life science principles, supported by mechanistic studies and conserved across related systems.

Ref: Alberts et al., Essential Cell Biology, 5th Edition, Chapter 1, Introduction to Cells, covers cellular organization, molecular mechanisms, genetic information and biological systems offering integrated perspective on core life science concepts.

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Physiology Ecology and Evolution

genetic cross was made between homozygous wild-type males (a ⁺ a ⁺ b ⁺ b ⁺ c ⁺ c ⁺ ) and triple - mutant females (aabbcc

Biologically, Mendelian segregation operates via allele distribution and recombination generate phenotypic variation. Thus Option NAT is appropriate since it follows segregation and linkage principles, reinforcing core concepts taught in genetics.

Ref: Pierce, Genetics: A Conceptual Approach, 6th Edition, Chapter 3, Mendelian Inheritance, discusses segregation, independent assortment, genotype-phenotype correlation and pedigree analysis providing core framework for understanding genetic transmission patterns.

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Physiology Ecology and Evolution

A distinctly large population of randomly mating laboratory mice contains 36% albino mice, which is caused by a double r

Understanding Mendelian segregation reveals allele distribution and recombination generate phenotypic variation. Therefore Option NAT is correct because it follows segregation and linkage principles, which underpins key processes in genetics. This mechanism is extensively documented and reinforced by experimental data across multiple model systems and textbook discussions.

Ref: Hartl and Jones, Genetics: Analysis of Genes and Genomes, 8th Edition, Chapter 7, Mutation and DNA Repair, covers mutation types, repair pathways, chromosomal aberrations and genome stability relevant to human genetic disorders.

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Physiology Ecology and Evolution

An enzyme that follows Michaelis-Menten kinetics catalyzes the conversion of 35 micro M substrate into product with a re

Biologically, enzyme kinetics operates via substrate binding and catalytic efficiency determine reaction rates. Thus Option NAT is appropriate since it reflects active-site specificity and regulation, reinforcing core concepts taught in biochemistry.

Ref: Lehninger Principles of Biochemistry, 7th Edition, Chapter 15, Metabolic Regulation, explains hormonal control, allosteric regulation, feedback inhibition and pathway coordination essential for understanding intermediary metabolism and homeostasis.

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Physiology Ecology and Evolution

The molecular weight of a double stranded DNA fragment present in mitochondria is 7.92 x 10 ⁸ g mol ⁻¹ . A pair of nucle

Evidence for enzyme kinetics indicates substrate binding and catalytic efficiency determine reaction rates. Option NAT aligns with this, as it reflects active-site specificity and regulation, reflecting standard interpretations in biochemistry.

Ref: Nelson and Cox, Lehninger Principles of Biochemistry, 7th Edition, Chapter 6, Enzyme Kinetics and Regulation, discusses Michaelis-Menten equation, catalytic mechanisms, allosteric control and metabolic integration supporting enzyme function and pathway regulation.

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