A population of 500 individuals has allele frequencies of A = 0.7 and a = 0.3. If the population follows Hardy-Weinberg equilibrium, what will be the frequency of heterozygotes in the next generation?

The correct answer is B: 0.42. Using Hardy-Weinberg equation: frequency of Aa = 2pq = 2(0.7)(0.3) = 0.42. This remains constant across generations in equilibrium.

The absence of which structure distinguishes jawless fish (Agnathans) from jawed fish (Gnathostomes)?

The correct answer is A: Paired fins. Agnathans (lampreys, hagfish) lack paired fins and jaws, while gnathostomes possess these structures along with true jaws derived from gill arches.

Which mechanism explains the coexistence of multiple predator species in the Indian savanna without competitive exclusion?

The correct answer is A: Niche partitioning. Niche partitioning allows different predator species to exploit different resources or hunting strategies, reducing direct competition.

A species shows 5 pairs of chromosomes. During meiosis in an individual heterozygous for all 5 genes (AaBbCcDdEe), what is the maximum number of different gamete types that can be produced?

The correct answer is C: 32. Without crossing over, the number of different gamete types = 2^n, where n = number of heterozygous gene pairs = 2^5 = 32.

In the classification of animals, which of the following represents the correct hierarchical order?

The correct answer is B: Kingdom → Phylum → Class → Order → Family → Genus → Species. The correct taxonomic hierarchy is Kingdom → Phylum → Class → Order → Family → Genus → Species (KPCOFGS).

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NEET Zoology
Human Physiology

Zoology questions for NEET UG — Animal Kingdom, Human Physiology, Genetics, Evolution.

25 Q 6 Topics Take Mock Test

Difficulty: All Easy Medium Hard 21–25 of 25

Topics in NEET Zoology

All Animal Kingdom 100 Human Physiology 100 Genetics & Evolution 100 Reproductive Health 100 Ecology & Environment 100 Biotechnology & Applications 40

Q.21 Hard Human Physiology

During the relative refractory period of an action potential, an action potential can be generated if the stimulus is:

A Stronger than threshold due to hyperpolarization

B Equal to the resting threshold

C Weaker than during depolarization

D Applied to inactive Na+ channels

Correct Answer: A. Stronger than threshold due to hyperpolarization

EXPLANATION

The relative refractory period occurs during repolarization when membrane potential is more negative than resting potential (hyperpolarized). A suprathreshold stimulus can overcome this increased threshold to generate an action potential.

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Q.22 Hard Human Physiology

The countercurrent multiplier mechanism in the Loop of Henle allows the kidney to produce concentrated urine by:

A Active transport of ions without water movement in ascending limb

B Passive diffusion of all solutes

C Random osmotic pressure changes

D Continuous filtration at equal rates

Correct Answer: A. Active transport of ions without water movement in ascending limb

EXPLANATION

The ascending limb actively transports Na+/K+/Cl- without water permeability, creating osmotic gradients that concentrate urine in the collecting duct.

Test

Q.23 Hard Human Physiology

A patient with nephrotic syndrome exhibits severe proteinuria. This occurs because:

A Glomerular filtration rate is severely reduced

B Increased permeability of glomerular filtration barrier

C Decreased plasma colloid osmotic pressure

D Increased glomerular hydrostatic pressure

Correct Answer: B. Increased permeability of glomerular filtration barrier

EXPLANATION

Nephrotic syndrome involves damage to the glomerular filtration barrier (podocytes), increasing permeability to plasma proteins like albumin.

Test

Q.24 Hard Human Physiology

During an action potential in a neuron, the rapid depolarization phase is primarily due to:

A Opening of K+ channels

B Closing of Na+ channels

C Opening of voltage-gated Na+ channels

D Activation of Na+/K+ ATPase

Correct Answer: C. Opening of voltage-gated Na+ channels

EXPLANATION

Depolarization occurs when voltage-gated Na+ channels open, allowing rapid Na+ influx that reverses membrane potential towards positive values.

Test

Q.25 Hard Human Physiology

A mutation affecting the dystrophin gene would primarily result in:

A Hemophilia

B Duchenne muscular dystrophy

C Cystic fibrosis

D Huntington's disease

Correct Answer: B. Duchenne muscular dystrophy

EXPLANATION

Dystrophin protein deficiency causes Duchenne muscular dystrophy, an X-linked recessive disorder affecting muscle structure and function.

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NEET Zoology
Human Physiology