Life Sciences (XL) PYQs Feb 2014

Physiology Ecology and Evolution

In a tray dryer, 100 kg of a vegetable material in a suitably reduced form is dried to yield a final product of 75 kg. T

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

A chocolate mix at 100°C is flowing through a 2 cm diameter and 4 m long stainless steel tube at 13.2 kg per minute. The

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

Water enters a cylindrical tank at a steady uniform rate of 0.1 m3 s ⁻¹ ; simultaneously water is discharged from the ta

The principle of verbal and logical reasoning explains that grammar, vocabulary and inference determine correct usage. Hence Option NAT fits best because it meets linguistic and logical standards, as documented in authoritative sources on 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

In an evaporator, milk is concentrated from 9.8% TSS to 52% TSS. Assume the solutes in the milk are non-volatile. The am

Evidence for core biological organization indicates structure-function relationships govern cellular processes. Option NAT aligns with this, as it integrates fundamental life science principles, reflecting standard interpretations in general biology. 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

Saturated steam at 100°C is injected at 0.2 kg s ⁻¹ into air stream flowing at 3 kg s ⁻¹ and 25°C. Air contains 0.012 kg

enzyme kinetics analysis shows substrate binding and catalytic efficiency determine reaction rates. Consequently Option NAT emerges as the valid choice since it reflects active-site specificity and regulation, aligning with established principles in biochemistry literature.

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

In a counter-current double pipe heat-exchanger, milk is cooled from 110 to 40°C using chilled water as coolant. Water e

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

A centrifuge having diameter of 10 cm is rotating at 10000 rpm. Take π = 22/7 and g = 9.81 m s ⁻² . The ratio of centrif

Mechanistically, verbal and logical reasoning involves grammar, vocabulary and inference determine correct usage. This validates Option NAT because it meets linguistic and logical standards, a pattern repeatedly demonstrated in general aptitude research.

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

In a sterilization process, D121.1 value of the target organism is 0.22 minute. Time required for 99.999% inactivation o

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

Shear stress (τ, Pa) and shear rate (γ, s ⁻¹ ) relationship of a pseudoplastic fluid follows the Power law equation give

Biologically, core biological organization operates via structure-function relationships govern cellular processes. Thus Option NAT is appropriate since it integrates fundamental life science principles, reinforcing core concepts taught in 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

Fruit juice is flowing in a circular pipe (inner diameter 2 cm) at a mass flow rate of 2 kg s ⁻¹ and at a temperature of

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

An experiment started with 4 numbers of bacterial cells. After nth generation, number of cells becomes 128. Therefore, v

Mechanistically, membrane organization involves lipid bilayer and protein trafficking maintain compartmentalization. This validates Option NAT because it aligns with organelle function and transport, a pattern repeatedly demonstrated in cell biology research.

Ref: Cooper and Hausman, The Cell: A Molecular Approach, 8th Edition, Chapter 14, Cell Cycle and Division, explains cyclins, cyclin-dependent kinases, checkpoints and mitotic regulation detailing mechanisms governing proliferation and genomic stability.

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Physiology Ecology and Evolution

In a solution of vegetable oil (molecular mass = 292 kg kmol ⁻¹ ) and ethanol (molecular mass = 46 kg kmol ⁻¹ ), the con

Understanding enzyme kinetics reveals substrate binding and catalytic efficiency determine reaction rates. Therefore Option NAT is correct because it reflects active-site specificity and regulation, which underpins key processes 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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