NEET Previous Year Questions(2016-24): Animal Kingdom | Biology Class 11 PDF Download

2024

Q1: 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
Ans: (b)
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

Q2: 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
Ans: (b)

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

Q3: 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
Ans: (c)
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.

Q4: 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
Ans: (b)
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

2023

Q1: Radial symmetry is NOT found in adults of phylum ______.     (NEET 2023)
(a) Ctenophora
(b) Hemichordata
(c) Coelenterata
(d) Echinodermata
Ans: (b)
Radial symmetry is a type of symmetry where an organism can be divided into similar halves by more than two planes passing through the central axis. This type of symmetry is found in organisms that tend to meet their environment in all directions, such as aquatic animals.

• Hemichordata : Adult organisms in this phylum, which includes acorn worms, pterobranchs, and graptolites, exhibit bilateral symmetry. This means they can be divided into two identical halves only along a single plane. Hence, radial symmetry is not found in the adults of this phylum.
• Coelenterata (also known as Cnidaria) : This phylum includes jellyfish, sea anemones, and corals. They exhibit radial symmetry. So, radial symmetry is found in this phylum.
• Echinodermata : Adult organisms in this phylum, which includes starfish, sea urchins, and sea cucumbers, exhibit radial symmetry. However, it's important to note that their larvae exhibit bilateral symmetry. Therefore, radial symmetry is found in adults of this phylum.
• Ctenophora (also known as comb jellies) : These marine animals also exhibit radial symmetry. Thus, radial symmetry is found in this phylum.

Q2: The unique mammalian characteristics are:     (NEET 2023)
(a) hairs, tympanic membrane and mammary glands
(b) hairs, pinna and mammary glands
(c) hairs, pinna and indirect development
(d) pinna, monocondylic skull and mammary glands
Ans: (b)

Unique mammalian characteristics include:

• Hair or fur: Mammals are the only animals that have hair. This hair helps to insulate the body to maintain a constant body temperature.
• Mammary glands: These are glands that, in females, produce milk for the nourishment of young ones. This is a characteristic feature of all mammals and is, in fact, the feature that gives this group its name.
• The presence of pinnae (external ears): Most mammals have pinnae that help to collect and direct sound waves into the ear.

Option B is incorrect because indirect development is not a unique characteristic of mammals; many animals, including certain insects, amphibians, and fishes, undergo indirect development.
Option C is incorrect because a monocondylic skull, in which the skull only articulates with the first vertebra via a single condyle, is a characteristic of some reptiles and amphibians, not mammals. Mammals possess a dicondylic skull, with two occipital condyles.
Option D is incorrect because while mammals do have a tympanic membrane (ear drum), it is not unique to mammals; other vertebrate groups, such as birds and reptiles, also have a tympanic membrane.
So, the correct answer is :
Option A : hairs, pinna and mammary glands.

Q3: 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
Ans: (b)
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 A : B and C only.

2022

Q1: Exoskeleton of arthropods is composed of:    (NEET 2022 Phase 1)
(a) Cellulose
(b) Chitin
(c) Glucosamine
(d) Cutin
Ans: (b)
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.

Q2: Given below are two statements: one is labelled as Assertion and the other is labelled as Reason.    (NEET 2022 Phase 1)
Assertion: All vertebrates are chordates, but all chordates are not vertebrates.
Reason: Notochord is replaced by a vertebral column in the adult vertebrates.
In the light of the above statements, choose the most appropriate answer from the options given below:
(a) Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
(b) Assertion is correct but Reason is not correct
(c) Assertion is not correct but Reason is correct
(d) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
Ans: (a)
Option (a) is the correct answer because all chordates are divided into three subphyla - Urochordata, Cephalochordata and Vertebrata. In subphylum Vertebrata, notochord is replaced by bony or cartilaginous vertebral column in adults. Therefore, all vertebrates are chordates but all chordates are not vertebrates.

Q3: Which of the following animals has three chambered heart?    (NEET 2022 Phase 2)
(a) Pteropus
(b) Scoliodon
(c) Hippocampus
(d) Chelone
Ans: (d)

• Option (4) is the correct answer because Chelone (turtle) is a reptile and the heart of reptiles are usually three-chambered except crocodiles.
• Option (1) is incorrect as Pteropus (flying fox) possess four -chambered heart.
• Option (2) and (3) are incorrect as Scoliodon (dog fish) and Hippocampus (sea horse) possess two - chambered heart.

Q4: Match List-I with List-II      (NEET 2022 Phase 2)

Choose the correct answer from the options given below :
(a) (a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
(b) (a) - (i), (b) - (iv), (c) - (iii), (d) - (ii)
(c) (a) - (ii), (b) - (i), (c) - (iv), (d) - (iii)
(d) (a) - (iii), (b) - (ii), (c) - (i), (d) - (iv)
Ans: (c)

• Penicillium asexually reproduces by conidia formation
• Chlamydomonas asexually reproduces by zoospores

Hydra reproduces by budding whereas sponges produce gemmules for asexual reproduction

Q5: 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
Ans: (d)
Option (d) is the correct answer because statement (b) is false as cyclostomes have a circular mouth without jaws and statement (d) is false as they migrate from marine water to fresh water for spawning. Statements (a) and (c) are correct for cyclostomes as they have 6-15 pairs of gills and body is divoid of scales and paired fins.

2021

Q1: Match the following    (NEET 2021)

Choose the correct answer from the options given below. 

     (a)  (b)  (c)   (d)
(a) (ii) (iii) (iv)   (i)
(b) (i)  (iv) (iii)  (ii)
(c) (ii) (iii)  (i)   (iv)
(d) (iv) (i)  (iii)  (ii)

Ans: (a)

• Option (d) is correct because Physalia belongs to phylum-Coelenterata (Cnidaria) and is commonly known as Portuguese man of war.
• Limulus is considered as a living fossil and commonly known as king crab.
• Ancylostoma is a roundworm and commonly known as hookworm.
• Pinctada is commonly known known as pearl oyster, included in phylum Mollusca.

Q2: 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
Ans: (b)

• Metagenesis (alternation of generation) is observed in members of phylum Coelenterata (Cnidaria).
• Echinoderms are triploblastic and coelomate animals as true coelom is observed in them.
• Roundworms (Aschelminths) have organ system level of organization.
• Comb plates present in ctenophores help in locomotion.
• Water vascular system is seen in echinoderms, which helps in locomotion, capture and transport of food and respiration.

Q3: Match List - I with List - II    (NEET 2021)

Choose the correct answer from the options given below.
      (a)       (b)     (c)      (d)
(a) (iii)       (iv)     (ii)     (i)
(b) (iv)       (i)       (ii)     (iii)
(c) (iv)       (iii)      (i)     (ii)
(d) (iii)       (iv)      (i)     (ii)
Ans: (a)

• Metamerism is commonly seen in the members of phylum Annelida where the body is externally and internally divided into segments with a serial repetition of at least some organs.
• Water canal system is present in the members of phylum Porifera.
• The body of ctenophores bears 8 external rows of ciliated comb plates which help in locomotion.
• Cnidoblasts or cnidocytes are characteristic feature of cnidarians (coelantrata).

Q4: Which one of the following organisms bears hollow and pneumatic long bones?    (NEET 2021)
(a) Macropus
(b) Ornithorhynchus
(c) Neophron
(d) Hemidactylus
Ans: (c)

• Hollow and pneumatic long bones are found in birds, which enables them to fly. Neophron(vulture) is a bird.
• Ornithorhynchus (Platypus) and Macropus (Kangaroo) belong to class Mammalia
• Hemidactylus (Wall lizard) is a member of class Reptilia.

Q5: Match List-I with List-II     (NEET 2021)

Choose the correct answer from the options given below.

(a)

(b)

(c)

(d)  

Ans: (d)

• Polar seal generally has shorter ears and limbs (extremities) to minimize heat loss. This is with reference to Allen's rule.
  Kangaroo rat exhibits physiological adaptation.
  Desert lizard shows behavioural adaptation. They lack the physiological ability to cope-up with extreme temperature but manage the body temperature by behavioural means.
  Marine fishes at depth are adapted biochemically to survive in great depths in ocean. 

2020

Q1: Bilaterally symmetrical and acoelomate animals are exemplified by :    (NEET 2020)
(a) Aschelminthes
(b) Annelida
(c) Ctenophora
(d) Platyhelminthes
Ans: (d)
Platyhelminthes are bilaterally symmetrical, triploblastic and acoelomate animals with organ level of organisation.

Q2: Which of the following statements are true for the phylum - Chordata?      (NEET 2020) 
(i) In Urochordata notochord extends from head to tail and it is present throughout their life.
(ii) In Vertebrata notochord is present during the embryonic period only.
(iii) Central nervous system is dorsal and hollow.
(iv) Chordata is divided into 3 subphyla: Hemichordata, Tunicata and Cephalochordata. 
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iv) and (iii)
(d) (iii) and (i)
Ans: (b)
In vertebrata, notochord is present during embryonic period only as it is replaced by vertebral column. In chordates, central nervous system is dorsal and hollow.

Q3: If the head of cockroach is removed, it may live for few days because     (NEET 2020) 
(a) the cockroach does not have nervous system.
(b) the head holds a small proportion of a nervous system while the rest is situated along the ventral part of its body.
(c) the head holds a 1/3rd of a nervous system while the rest is situated along the dorsal part of its body.
(d) the supra-oesophageal ganglia of the cockroach are situated in ventral part of abdomen.
Ans: (b)
Cockroaches breathe passively through a network of pipes connected to holes called spiracles along the length of their body. They are independent of blood circulation to move oxygen around and their body fluids are at a much lower pressure. The sensory input from the eyes and antennae, along with many other behaviours, are transmitted and handled by their brain such as running and reacting to touch, handled by ‘mini brains’ called ganglia in each body segment. A decapitated cockroach will eventually starve to death but this can still take few days.

Q4: Match the following columns and select the correct option –    (NEET 2020)


Ans: (d)
Locusta is a gregareous pest. In Echinoderms, adults are radially symmetrical but larvae are bilaterally symmetrical. Scorpions respire through book lungs. Bioluminescence is well marked in ctenophores.

Q5: Match the following columns and select the correct option.    (NEET 2020)

Ans: (c)

• Cyclostomes have an elongated body bearing 6-15 pairs of gill slits for respiration. The caudal fin is the tail fin located at the end of the caudal peduncle and is used for propulsion. See body-caudal fin locomotion.
• Heterocercal means the vertebrae extend into the upper lobe of the tail, making it longer (as in sharks). It is the opposite of hypocercal.
• Air bladder and poison string (for. e.g, Trygon) are found in Chondrichthyes as they have to swim constantly to avoid sinking. 

2019

Q1: Consider following features.    (NEET 2019)
(A) Organ system level of organisation
(B) Bilateral symmetry
(C) True coelomates with segmentation of body
Select the correct option of animal groups which possess all the above characteristics.
(a) Annelida, Mollusca and Chordata
(b) Annelida, Arthropoda and Chordata
(c) Annelida, Arthropoda and Mollusca
(d) Arthropoda, Mollusca and Chordata
Ans: (b)
Annelida, arthropoda and chordata have all the given three features: Organ system level of organization, Bilateral symmetry, true coelomates with segmentation of body.

Q2: Match the following organisms with respective characteristics.     (NEET 2019)

Select the correct option from the following.

Ans:  (c)

• Pila (mollusca) have radula
• Bombyx (arthropoda) have malphigian tubules.
• Pleurobrachia (ctenophora) have comb plates.
• Taenia (platyhelminthes) have flame cells for excretion.

2018

Q1: Which of the following animals does not undergo metamorphosis?    (NEET 2018)
(a) Earthworm
(b) Tunicate
(c) Moth
(d) Starfish
Ans: (a)
In earthworm development is direct i.e., there is no larval stage and hence no metamorphosis.

Q2: Identify the vertebrate group of animals characterised by crop and gizzard in its digestive system.      (NEET 2018)
(a) Amphibia
(b) Reptilia
(c) Aves
(d) Osteichthyes
Ans: (c)
The digestive tract of aves has additional chambers in their digestive system as crop and gizzard. Crop is concerned with storage of food grains, whereas gizzard is a masticatory organ in birds used to crush food grain.

Q3: Which one of these animals is not a homeotherm?    (NEET 2018)
(a) Macropus
(b) Chelone
(c) Camelus
(d) Psittacula
Ans: (b)
Reptiles (Chelone = Turtles) are poikilotherms or cold blooded, whereas birds (Psittacula = Parrot) and mammals (Macropus = Kangroo, Camelus = Camel) are homeotherm which maintain constant body temperature, irrespective of surrounding temperature by metabolic activity.

2017

Q1: Which among these is the correct combination of aquatic mammals?    (NEET 2017)
(a) Dolphins, Seals, Trygon
(b) Whales, Dolphins, Seals
(c) Trygon, Whales, Seals
(d) Seals, Dolphins, Sharks
Ans: (b)
Whales, dolphin and seals are examples of aquatic mammals. Trygon and sharks are cartilaginous fishes.

Q2: In case of poriferans, the spongocoel is lined with flagellated cells called    (NEET 2017)
(a) Oscula
(b) Choanocytes
(c) Mesenchymal cells
(d) Ostia
Ans: (b)
In poriferans (sponges) choanocytes (collar cells) form lining of spongocoel. Flagella present in collar cells provide circulation to water in water canal system.

Q3: Important characteristic that hemichordates share with chordates is     (NEET 2017)
(a) Ventral tubular nerve cord
(b) Pharynx with gill slits
(c) Pharynx without gill slits
(d) Absence of notochord
Ans: (b)
Solution.
Pharyngeal gill slits are present in hemichordates and in chordates. Notochord is present in chordates only. Ventral tubular nerve cord is present in non-chordates.

Q4: Which of the following represents order of ‘Horse’?    (NEET 2017)
(a) Perissodactyla
(b) Caballus
(c) Ferns
(d) Equidae
Ans: (a)
Horse belongs to :

• Orders - Perissodactyla
• Family - Equidae
• Genus - Equus
• Species - ferus
• Subspecies - caballus

2016

Q1: Which of the following characteristic features always holds true for the corresponding group of animals?     (NEET 2016)

Ans: (c)
Phylum Chordata includes both jawless vertebrates (Agnatha) and jawed vertebrates (Gnathostomata). Crocodile of Class Reptilia has four chambered heart with two auricles and two ventricles. Duck billed platypus and spiny anteater are oviparous mammals.

Q2: Which of the following features is not present in the Phylum Arthropoda?    (NEET 2016)
(a) Parapodia
(b) Jointed appendages
(c) Chitinous exoskeleton
(d) Metameric segmentation
Ans: (a)
Parapodia are flattened, fleshy, vertical flaplike outgrowths of body wall found in annelids on lateral sides of trunk segments. These are hollow structures enclosing coelom which is continuous with that of trunk segments. These serve the dual purpose of locomotion and respiration.

Q3: Which one of the following characteristics is not shared by birds and mammals?     (NEET 2016)
(a) Viviparity
(b) Warm-blooded nature
(c) Ossified endoskeleton
(d) Breathing using lungs
Ans: (a)
Giving birth to young that develop within the mother’s body rather than hatching from eggs. All mammals except the monotremes are viviparous.

Q4: Choose the correct statement.     (NEET 2016 Phase 2)
(a) All mammals arc viviparous.
(b) All cyclostomes do not possess jaws and paired fins.
(c) All reptiles have a three-chambered heart.
(d) All Pisces have gills covered by an operculum.
Ans: (b)
Solution.
Ornithorhynchus and Tachyglossus are oviparous mammals. Crocodile is a reptile which possesses four chambered heart. In cartilaginous fish (except Chimaera) gills are not covered by an operculum.

Q5: Match column I with column II for housefly classification and select the correct option using the codes given below.

(a) (A)-(iii),  (B)-(i),  (C)-(iv),  (D)-(ii)
(b) (A)-(iii),  (B)-(ii),  (C)-(iv),  (D)-(i)
(c) (A)-(iv),  (B)-(iii),  (C)-(ii),  (D)-(i)
(d) (A)-(iv),  (B)-(ii),  (C)-(i),  (D)-(iii)     (NEET 2016 Phase 2)
Ans: (a)
Classification of housefly
A. Family – Muscidae
B. Order – Diptera
C. Class – Insecta
D. Phylum – Arthropoda