Which of the following is NOT a characteristic of arthropods?

The correct answer is C: Closed circulatory system. Arthropods have an open circulatory system, not closed. They are characterized by jointed appendages, chitinous exoskeleton, and segmented bodies.

A 35-year-old woman with polycystic ovary syndrome (PCOS) seeks contraception with metabolic benefits. Which method would be most appropriate?

The correct answer is A: Combined oral contraceptives with anti-androgenic progestin. Combined OCPs with anti-androgenic progestins (like cyproterone acetate or spironolactone) provide contraception while treating PCOS-related hyperandrogenism and improving metabolic parameters.

In a pond ecosystem, phytoplankton occupy which trophic level?

The correct answer is B: Primary producers. Phytoplankton are autotrophic organisms that produce their own food through photosynthesis, making them primary producers in aquatic ecosystems.

A student observes an organism with radial symmetry, stinging cells (cnidocytes), and a gastrovascular cavity. It belongs to which phylum?

The correct answer is B: Cnidaria. The presence of cnidocytes (stinging cells), radial symmetry, and gastrovascular cavity are defining characteristics of Cnidaria (corals, jellyfish, hydra).

Which of the following statements about mutations is INCORRECT?

The correct answer is B: Most mutations are beneficial for organism survival. Most mutations are either neutral or harmful; only rarely are they beneficial. This is a key principle in evolutionary biology.

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NEET Zoology
Animal Kingdom

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

22 Q 6 Topics Take Mock Test

Difficulty: All Easy Medium Hard 21–22 of 22

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 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.

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Q.22 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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NEET Zoology Animal Kingdom

NEET Zoology
Animal Kingdom