During increased physical activity, which compensatory mechanism helps maintain blood pH within normal range?

The correct answer is A: Increased respiratory rate to eliminate CO2. During exercise, lactate production increases blood acidity. Hyperventilation increases CO2 elimination, shifting the CO2-bicarbonate equilibrium to maintain blood pH (7.35-7.45).

Which of the following is a correct statement about the structure and function of fish gills?

The correct answer is B: Countercurrent flow between water and blood ensures maximum oxygen extraction. Fish gills operate on a countercurrent exchange principle where blood flows opposite to water flow, maximizing oxygen extraction efficiency to about 80-90%.

Which of the following statements about RNAi (RNA interference) is correct?

The correct answer is B: It silences gene expression by degrading specific mRNA molecules. RNAi uses small interfering RNAs (siRNA) or short hairpin RNA (shRNA) to target and degrade specific mRNA molecules, leading to gene silencing.

The process of ecological succession following a forest fire is classified as:

The correct answer is B: Secondary succession. Secondary succession occurs on previously colonized areas where soil remains intact, such as after a fire. Primary succession occurs on bare rock or new land.

In humans, if both parents are heterozygous carriers of sickle cell anemia (HbAS), what is the probability of their child being completely unaffected?

The correct answer is C: 0.75. Cross: AS × AS produces AA (unaffected, 1/4), AS (carrier, 1/2), SS (affected, 1/4). Probability of unaffected = 1/4 + 1/2 = 3/4 = 0.75

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NEET Zoology

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

114 Q 6 Topics Take Mock Test

Difficulty: All Easy Medium Hard 111–114 of 114

Topics in NEET Zoology

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

Q.111 Hard Animal Kingdom

Which class of animals shows maximum biological diversity and why?

A Mammalia - due to complex behavior

B Insecta - due to adaptability, shorter life cycles, and diverse ecological niches

C Aves - due to flight adaptations

D Pisces - due to aquatic diversity

Correct Answer: B. Insecta - due to adaptability, shorter life cycles, and diverse ecological niches

EXPLANATION

Insects represent over 80% of described animal species due to their adaptability, rapid reproduction, metamorphosis, and ability to occupy diverse ecological niches.

Test

Q.112 Hard Animal Kingdom

The development of amnion and allantois in embryos is an adaptation for:

A Aquatic reproduction

B Internal fertilization only

C Terrestrial reproduction independent of water

D Placental nutrition

Correct Answer: C. Terrestrial reproduction independent of water

EXPLANATION

The amnion protects the embryo in fluid, and allantois stores waste products, allowing amniotes to reproduce on land without dependence on water.

Test

Q.113 Hard Animal Kingdom

Which of the following represents a more recent evolutionary relationship (sister group)?

A Arthropods and Molluscs

B Birds and Reptiles

C Fish and Amphibians

D Cnidarians and Echinoderms

Correct Answer: B. Birds and Reptiles

EXPLANATION

Modern cladistic analysis shows birds are derived from theropod dinosaurs (reptiles), making them sister groups with a more recent common ancestor.

Test

Q.114 Hard Animal Kingdom

In the phylogenetic tree of animals, which phylum is believed to be ancestral to arthropods?

A Annelida

B Mollusca

C Platyhelminthes

D Nematoda

Correct Answer: A. Annelida

EXPLANATION

Annelids and arthropods share similarities in segmentation and structure, suggesting arthropods evolved from annelid-like ancestors.

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