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All questions of Animal Kingdom for NEET Exam

Which of the following represents the correct combination without any exception?        [2015 RS] 
  • a)
    a
  • b)
    b
  • c)
    c
  • d)
    d
Correct answer is option 'A'. Can you explain this answer?

Muskaan Basak answered
(a) (i) Aves possess dry skin, without glands except oil gland near the base of tail. (ii) Pinnae are not found in aquatic animals and egg laying mammals. (iii) In cyclostomes, unpaired appendages (joints) are found.

Which of the following featrues is not present in the Phylum - Arthropoda ?           [2016]
  • a)
    Chitinous exoskeleton
  • b)
    Metameric segmentation
  • c)
    Parapodia
  • d)
    Jointed appendages 
Correct answer is option 'C'. Can you explain this answer?

Pallabi Reddy answered
(c) All arthropods possess a stiff exoskeleton (external skeleton) composed primarily of chitin. Arthropod bodies are divided into segments. Parapodia are paired, lateral appendages extending from the body segments. Arthropod appendages may be either biramous (branched) or uniramous (unbranched). They do not possess jointed appendages. 

 A marine cartilaginous fish that can produce electric current is:      [2014]
  • a)
    Pristis
  • b)
    Torpedo
  • c)
    Trygon
  • d)
    Scoliodon 
Correct answer is option 'B'. Can you explain this answer?

Gowri Nair answered
(b) Torpedo is a sluggish fish. It is carnivorous. The prey is first killed by electric shock. The shock can also be harmful for human beings.

In which one of the following the genus name, its two charcters and its phylum are not correctly matched, whereas the remaining three are correct
[2012]
  • a)
    a
  • b)
    b
  • c)
    c
  • d)
    d
Correct answer is option 'A'. Can you explain this answer?

Palak Khanna answered
Molluscans are soft bodied animals. Their body is unsegmented with a distinct head, muscular foot and visceral hump. In Pila the buccal cavity contains a resping organ, the radula with transverse rows of teeth.

One of there presentatives of phylum Arthropoda is : [NEET 2013]
  • a)
    Silverfish
  • b)
    Pufferfish
  • c)
    Flying fish
  • d)
    Cuttlefish
Correct answer is option 'A'. Can you explain this answer?

Palak Khanna answered
Representive of Phylum Ar thropoda is silverfish. Arthropoda is the largest phylum of Animalia, which covers two-thirds of all named species.

Which of the following characteristic features always holds true for the corresponding group of animals?             [2016]
  • a)
    Cartilaginous Chondrichthyes endoskeleton
  • b)
    Viviparous Mammalia
  • c)
    Possess a mouth Chordata with an upper and a lower jaw
  • d)
    3 - chambered heart Reptilia with one incompletely divided ventricle
Correct answer is option 'A'. Can you explain this answer?

Yash Saha answered
(a) Chondrichthyes always have cartilaginous endoskeleton. Most mammals are viviparous, giving birth to live young. However, the five species of monotreme, the platypuses and the echidnas, lay eggs. Chordates have jawless animals (Agnatha) as well. Most reptiles have 3 chambered heart. Crocodilians have 4 chambered hearts. Turtles have 3 chambered heart but with an incomplete wall in the single ventricle, so their hearts are functionally 4 chambered.

Bilaterally symmetrical and acoelomate animals are exemplified by :   [NEET 2020]
  • a)
    Aschelminthes
  • b)
    Annelida
  • c)
    Ctenophora
  • d)
    Platyhelminthes
Correct answer is option 'D'. Can you explain this answer?

Mira Joshi answered
Flatworms are bilaterally symmetrical, triploblastic and acoelomate animals with organ level of organisation. Aschelminthes is triploblastic, bilaterally symmetrical and pseudocoelomate. Annelida is triploblastic, bilaterally symmetrical and acoelomate. Ctenophora is radially symmetrical, diploblastic.

 Which of the following are correctly matched with respect to their taxonomic classification? [NEET 2013]
  • a)
    Centipede, millipede, spider, scorpionInsecta
  • b)
    House fly, butterfly, tse tse fly, silverfishInsecta
  • c)
    Spiny anteater, sea urchin, sea cucumberEchinodermata
  • d)
    Flying fish, cuttlefish, silverfish-Pisces
Correct answer is option 'B'. Can you explain this answer?

Akanksha Menon answered
Taxonomic Classification of Insects

Insects belong to the phylum Arthropoda and the class Insecta. They are characterized by having three body segments, six legs, and wings (in most cases).

Correctly Matched Taxonomic Classification

Option B is the correct answer as all the organisms listed belong to the class Insecta.

House fly - Order Diptera
Butterfly - Order Lepidoptera
Tse tse fly - Order Diptera
Silverfish - Order Thysanura

Incorrectly Matched Taxonomic Classification

Option A is incorrect as centipede, millipede, spider, and scorpion belong to different classes:

Centipede - Class Chilopoda
Millipede - Class Diplopoda
Spider - Class Arachnida
Scorpion - Class Arachnida

Option C is incorrect as spiny anteater, sea urchin, and sea cucumber belong to different phyla:

Spiny anteater - Phylum Chordata
Sea urchin - Phylum Echinodermata
Sea cucumber - Phylum Echinodermata

Option D is incorrect as flying fish and cuttlefish belong to different classes:

Flying fish - Class Actinopterygii
Cuttlefish - Class Cephalopoda.

Which one of the following statements about certain given animals is correct? [2010]
  • a)
    Round worms (Aschelminthes) are pseudocoelomates
  • b)
    Molluscs are acoelomates
  • c)
    Insects are pseudocoelomates
  • d)
    Flat worms (Platyhelminthes) are coelomates
Correct answer is option 'A'. Can you explain this answer?

Ayush Chavan answered
Acoelomates are animals that have no body cavity or coelom. The examples are poriferans, coelenterates, ctenophore, Platyhelminthes and nemertean. pseudocoelomates are animals that has false or pseudo coelom. Examples are aschelminthes. Coelomates are animals that has true coelom enclosed by mesoderm on both sides. Examples: from annelida to arthropoda are coelomates. Hence roundworms are pseudocoelomates, molluses and insects are coelomates while flatworms are acoelomates.

What will you look for to identify the sex of the following? [2011]
  • a)
    Female Ascaris- Sharply curved posterior end
  • b)
    Male frog- A copulatory pad on the first digit of the hind limb
  • c)
    Female cockroach-Anal cerci
  • d)
    Male shark-Claspers borne on pelvic fins
Correct answer is option 'D'. Can you explain this answer?

Ishaan Menon answered
A male shark possesses a pair of claspers which are inserted into a female shark’s cloaca (an opening on the underside of the body) at the time of mating. Claspers are located on the inner edge of the pelvic fins near the male’s cloaca. The function of claspers is to introduce sperm into a female shark’s body for the purpose of fertilizing her eggs. Female sharks do not have claspers.

Frogs differ from humans in possessing:
  • a)
    paired cerebral hemispheres [2011M]
  • b)
    hepatic portal system
  • c)
    nucleated red blood cells
  • d)
    thyroid as well as parathyroid
Correct answer is option 'C'. Can you explain this answer?

Ayush Chavan answered
Human possesses enucleated RBC in mature state. But frog blood has both white and red blood cells which are nucleated. Frog cells do not lack platelets.

Consider the following statements :     (NEET 2024)
A. Annelids are true coelomates
B. Poriferans are pseudocoelomates
C. Aschelminthes are acoelomates
D. Platyhelminthes are pseudocoelomates
Choose the correct answer from the options given below :
  • a)
    B only
  • b)
    A only
  • c)
    C only
  • d)
    D only
Correct answer is option 'B'. Can you explain this answer?

Let's evaluate each statement with regard to the type of body cavity they describe:
A. Annelids are true coelomates: This statement is correct. Annelids (segmented worms, including earthworms) possess a true coelom, which is a body cavity fully lined with a mesodermal layer more specifically called peritoneum. This allows for the distinction of the internal organs from the body wall, and it facilitates greater complexity and organization of the internal structures.
B. Poriferans are pseudocoelomates: This statement is incorrect. Poriferans (sponges) do not have any type of body cavity. Sponges are at a basic level of complexity and lack true tissues and organs, including a coelom or a pseudocoelom. They are considered to have no body cavity and are thus neither coelomates nor pseudocoelomates.
C. Aschelminthes are acoelomates: This statement is incorrect. Aschelminthes, more commonly referred to as Nematoda or roundworms, are actually pseudocoelomates. They possess a pseudocoelom, which is a body cavity that is not entirely lined by mesodermal tissue, unlike a true coelom. The pseudocoel serves as a rudimentary circulatory system and provides a space for internal organs.
D. Platyhelminthes are pseudocoelomates: This statement is incorrect. Platyhelminthes (flatworms) are acoelomates, meaning they lack any body cavity. Their bodies are solid between the digestive tract and the body wall, lacking a filled cavity that would separate these structures.
From the analysis above, only statement A is accurate:
  • A. Annelids are true coelomates - Correct
  • B. Poriferans are pseudocoelomates - Incorrect
  • C. Aschelminthes are acoelomates - Incorrect
  • D. Platyhelminthes are pseudocoelomates - Incorrect
Thus, the correct answer to the question is: Option B

Which one of the following animals is correctly matched with its one characteristics and the taxon? [NEET Kar. 2013]
  • a)
    a
  • b)
    b
  • c)
    c
  • d)
    d
Correct answer is option 'A'. Can you explain this answer?

Duckbilled platypus is oviparous and comes under phylum mammalia. Millipede belongs to the phylum arthropoda. Seaanemone is diploblastic belongs to phylum cnidaria. Silver-fish is an insect belongs to phylum arthropoda, having long antennae, no wings and move in a wiggling motion that resembles the movement of a fish.

Select the incorrect statements with respect to Cyclostomes:     (NEET 2022 Phase 2)
(a) They lack scales and paired fins.
(b) They have circular mouth with jaws.
(c) They bear 6-15 pairs of gills.
(d) They migrate to deep sea for spawning.
Choose the most appropriate answer from the options given below:
  • a)
    (a) and (d) only
  • b)
    (a) and (b) only
  • c)
    (b) and (c) only
  • d)
    (b) and (d) only
Correct answer is option 'D'. Can you explain this answer?

Sneha Chopra answered
Understanding Cyclostomes
Cyclostomes, a group of jawless fish that includes lampreys and hagfish, exhibit unique characteristics that set them apart from other vertebrates. Let's analyze the statements provided about them.
Statement Analysis
  • (a) They lack scales and paired fins.
    This statement is correct. Cyclostomes do not possess scales or paired fins, which distinguishes them from many other fish species.
  • (b) They have circular mouth with jaws.
    This statement is incorrect. Cyclostomes have a circular mouth, but they lack true jaws. Instead, they have a sucker-like mouth, which is characteristic of their feeding mechanism.
  • (c) They bear 6-15 pairs of gills.
    This statement is correct. Cyclostomes typically possess multiple pairs of gills for respiration.
  • (d) They migrate to deep sea for spawning.
    This statement is incorrect for most cyclostomes. While some species may have specific spawning behaviors, many migrate to freshwater or nearshore environments rather than the deep sea.

Conclusion
Based on the analysis:
- Statements (b) and (d) are incorrect. Cyclostomes do not possess jaws and do not typically migrate to the deep sea for spawning.
- Therefore, the correct answer is option 'D', which identifies the incorrect statements as (b) and (d).
This understanding helps clarify the biological traits of cyclostomes, distinguishing them from other fish groups.

Select the correct statements with reference to chordates.     (NEET 2023)
A. Presence of a mid-dorsal, solid and double nerve cord.
B. Presence of closed circulatory system.
C. Presence of paired pharyngeal gill slits.
D. Presence of dorsal heart
E. Triploblastic pseudocoelomate animals.
Choose the correct answer from the options given below:
  • a)
    A, C and D only
  • b)
    B and C only
  • c)
    B, D and E only
  • d)
    C, D and E only
Correct answer is option 'B'. Can you explain this answer?

Bs Academy answered
Chordates are defined by having certain specific anatomical features at some point during their development. The correct attributes of chordates are:
1. Presence of a dorsal, hollow nerve cord (not a mid-dorsal, solid and double nerve cord as mentioned in statement A)
2. Presence of a closed circulatory system.
3. Presence of paired pharyngeal gill slits.
4. Presence of a post-anal tail.
5. Presence of a notochord.
Regarding the other statements :
- The heart of chordates is ventral, not dorsal (as in statement D).
- Chordates are triploblastic and coelomate, not pseudocoelomate (as in statement E).
So, based on these facts, the correct answer is :
Option B : B and C only.

Which of the following animals has three chambered heart?    (NEET 2022 Phase 2)
  • a)
    Pteropus
  • b)
    Scoliodon
  • c)
    Hippocampus
  • d)
    Chelone
Correct answer is option 'D'. Can you explain this answer?

Sandeep Pillai answered
Understanding the Three-Chambered Heart
The three-chambered heart is a unique anatomical feature found in certain animals, primarily among amphibians and reptiles. It consists of two atria and one ventricle, which allows for a mix of oxygenated and deoxygenated blood.
Key Characteristics of Chelone
- Chelone refers to the genus of sea turtles, which are reptiles.
- Reptiles, including Chelone, possess a three-chambered heart that is adapted for their lifestyle.

Structure of the Heart
- Two Atria: The heart has two separate atria—one receives oxygenated blood from the lungs, while the other receives deoxygenated blood from the body.
- Single Ventricle: The ventricle allows for the mixing of both types of blood, which is less efficient than a four-chambered heart but suitable for their metabolic needs.
Comparison with Other Options
- Pteropus: This is a genus of flying foxes, which have a four-chambered heart similar to other mammals.
- Scoliodon: Commonly known as dogfish sharks, these fish possess a two-chambered heart, typical of most fish species.
- Hippocampus: Also known as seahorses, they have a two-chambered heart, characteristic of bony fish.
Conclusion
The correct answer to the question is Chelone because it is a reptile with a three-chambered heart. This heart structure is efficient for their specific respiratory and circulatory needs, allowing them to thrive in aquatic environments.

The following are the statements about non-chordates:      (NEET 2024)
A. Pharynx is perforated by gill slits.
B. Notochord is absent.
C. Central nervous system is dorsal.
D. Heart is dorsal if present.
E. Post anal tail is absent.Choose the most appropriate answer from the options given below:
  • a)
    A & C only
  • b)
    A, B & D only
  • c)
    B, D & E only
  • d)
    B, C & D only
Correct answer is option 'C'. Can you explain this answer?

Ciel Knowledge answered
The correct answer is Option C: B, D & E only. Here's why:
B. Notochord is absent: This is the defining characteristic of non-chordates. Chordates possess a notochord at some stage of their development, while non-chordates do not.
D. Heart is dorsal if present: In non-chordates with a circulatory system, the heart is located on the dorsal (back) side of the body, unlike chordates where it's ventral (front).
E. Post anal tail is absent: Non-chordates lack a post-anal tail, a feature present in chordates.
Why the other options are incorrect:
A. Pharynx is perforated by gill slits: This is a characteristic of chordates, particularly in aquatic forms for respiration.
C. Central nervous system is dorsal: While this is true for chordates, non-chordates have a ventral nerve cord.

Radial symmetry is NOT found in adults of phylum ______.     (NEET 2023)
  • a)
    Ctenophora
  • b)
    Hemichordata
  • c)
    Coelenterata
  • d)
    Echinodermata
Correct answer is option 'B'. Can you explain this answer?

Understanding Radial Symmetry
Radial symmetry is a body plan in which body parts are arranged around a central axis. This type of symmetry is most commonly found in organisms that are aquatic and often sessile or free-floating.
Phylum Analysis
- Ctenophora (Comb Jellies):
- Exhibit radial symmetry in adults.
- Hemichordata (Acorn Worms):
- Adults display bilateral symmetry, not radial.
- They possess a segmented body and a distinct head region.
- Coelenterata (Cnidaria):
- Have radial symmetry in their adult forms (e.g., jellyfish, corals).
- Echinodermata (Starfish, Sea Urchins):
- Exhibit radial symmetry, typically pentamerous (five-part) symmetry in adults.
Conclusion
The correct answer is B (Hemichordata) because, unlike the other phyla listed, hemichordates demonstrate a bilateral symmetry as adults. Understanding these symmetries helps in the classification and study of various organisms within their respective phyla.

Exoskeleton of arthropods is composed of:    (NEET 2022 Phase 1)
  • a)
    Cellulose
  • b)
    Chitin
  • c)
    Glucosamine
  • d)
    Cutin
Correct answer is option 'B'. Can you explain this answer?

Lead Academy answered
Option (b) is the correct answer as chitin forms the exoskeleton is arthropods and is found in fungal cell wall. N-acetyl glucosamine is the monomeric unit. Cellulose is a polysaccharide. Cutin is a derived lipid.

Read the following statements.    (NEET 2021)
(a) Metagenesis is observed in Helminths.
(b) Echinoderms are triploblastic and coelomate animals.
(c) Round worms have organ-system level of body organization
(d) Comb plates present in ctenophores help in digestion.
(e) Water vascular system is characteristic of Echinoderms.
Choose the correct answer from the options given below.
  • a)
    (a), (d) and (e) are correct
  • b)
    (b), (c) and (e) are correct
  • c)
    (c), (d) and (e) are correct
  • d)
    (a), (b) and (c) are correct
Correct answer is option 'B'. Can you explain this answer?

Mira Joshi answered
  • Those cnidarians which exist in both forms exhibit alternation of generation (Metagenesis), i.e., polyps produce medusae asexually and medusae form the polyps sexually (e.g., Obelia).
  • The body bears eight external rows of ciliated comb plates, which help in locomotion.
  • Roundworms have organ-system level of body organisation.
  • They are triploblastic and coelomate animals.
  • The most distinctive feature of echinoderms is the presence of water vascular system which helps in locomotion, capture and transport of food and respiration.

Which one of the following groups of animals reproduces only by sexual means? [NEET Kar. 2013]
  • a)
    Ctenophora
  • b)
    Cnidaria
  • c)
    Porifera
  • d)
    Protozoa
Correct answer is option 'A'. Can you explain this answer?

Rajat Roy answered
In Ctenophora, sexes are not separate. Reproduction takes place only by sexual means. In Cnidaria, which exist in both forms, polyps produce medusae asexually and medusae form the polyps sexually. Porifera (sponge) reproduce asexually by fragmentation and sexually by formation of gametes. Protozoans come under protista which reproduce asexually and sexually by cell fusion and zygote formation.

Match List I with List II :     (NEET 2024)

Choose the correct answer from the options given below :
  • a)
    A-II, B-I, C-IIII, D-IV
  • b)
    A-III, B-I, C-II, D-IV
  • c)
    A-IV, B-I, C-II, D-III
  • d)
    A-III, B-II, C-I, D-IV
Correct answer is option 'B'. Can you explain this answer?

Let's analyze the match between the items in List I and those in List II. We will specifically address the scientific names provided in List I and match them with their common names given in List II:
List I (Scientific Names) with List II (Common Names):
  • Pterophyllum (A) - Angel fish (III): Pterophyllum is the scientific name for a type of cichlid commonly called angel fish. Therefore, A matches with III.
  • Myxine (B) - Hag fish (I): Myxine is the genus for hagfish, which are known for their slime-producing capability. Hence, B matches with I.
  • Pristis (C) - Saw fish (II): Pristis is the genus comprising the sawfishes, which are known for their long, saw-like rostrums. Consequently, C matches with II.
  • Exocoetus (D) - Flying fish (IV): Exocoetus is a genus of marine fish known as flying fish, due to their ability to glide above the water's surface for short distances. Therefore, D matches with IV.
Now, compiling these matches together:
  • A - III
  • B - I
  • C - II
  • D - IV
The correct option that matches each scientific name with their respective common names accordingly is: 
Option B: A-III, B-I, C-II, D-IV

Which one of the following have the highest number of species in nature? [2011]
  • a)
    Fungi
  • b)
    Insects
  • c)
    Birds
  • d)
    Angiosperms
Correct answer is option 'B'. Can you explain this answer?

Rajat Roy answered
In nature insects have the highest number of species (30 million). Fungi have 100,000, angiosperms have 260000 and birds have 10,000 species.

Which group of animals belong to the same phylum? [NEET 2013]
  • a)
    Earthworm , Pinworm, Tapeworm
  • b)
    Prawn, Scorpion, Locusta
  • c)
    Sponge, Sea anemone, Starfish
  • d)
    Malarial parasite, Amoeba, Mosquito
Correct answer is option 'B'. Can you explain this answer?

Deepak Joshi answered
Prawn , Scorpion and Locusta belong to phylum Arthropoda. This is the largest phylum of Animalia, over two-thirds of all named species on earth are Arthropoda. Phylum is named so due to presence of jointed appendages (arthros = jointed, poda = appendages) in  body of members of this phylum.

Match List I with List II:     (NEET 2024)
Choose the correct answer from the options given below :
  • a)
    A-IV, B-II, C-III, D-I
  • b)
    A-II, B-I, C-IV, D-III
  • c)
    A-II, B-IV, C-I, D-III
  • d)
    A-IV, B-III, C-II, D-I
Correct answer is option 'B'. Can you explain this answer?

Mohit Rajpoot answered
To solve this matching question, we must evaluate each term in List I and determine its corresponding class or phylum in List II. Let's analyze each match:
Pleurobrachia: Pleurobrachia is a genus that belongs to the phylum Ctenophora, which is commonly known as comb jellies. Thus, A should be matched with II (Ctenophora).
Radula: A radula is a toothed, chitinous organ found within mollusks that is used for scraping or cutting food before the food enters the esophagus. Hence, B should be matched with I (Mollusca).
Stomochord: The stomochord is a small, tubular structure found in the collar of hemichordates, a fundamental character previously thought to link hemichordates and chordates. Therefore, C should be matched with IV (Hemichordata).
Air bladder: The air bladder, or swim bladder, is a gas-filled sac present in many bony fish that helps to maintain buoyancy. Hence, D should be matched with III (Osteichthyes, a class of bony fish).
Now, let's review the options given:
  • Option A: A-IV, B-II, C-III, D-I
  • Option B: A-II, B-I, C-IV, D-III
  • Option C: A-II, B-IV, C-I, D-III
  • Option D: A-IV, B-III, C-II, D-I
The correct matches, based on the classification should be: A-II, B-I, C-IV, D-III. Therefore, the correct answer is: Option B

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