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All questions of Animal Kingdom for NEET Exam

The cross-section of the body of an invertebrate is given below. Identify the animal which has this body plan.
  • a)
    Cockroach
  • b)
    Earthworm
  • c)
    Roundworm
  • d)
    Planaria
Correct answer is option 'D'. Can you explain this answer?

Stepway Academy answered
  • It has three-layered body wall which includes ectoderm, endoderm, and mesoderm. 
  • Acoelomates lack a body cavity, and instead the space between the body wall and the digestive tract is filled with muscle fibres and loose tissue called parenchyma.
  • It acts as a skeletal support, nutrient storage, motility, reserves of regenerative cells and transporting materials.
  • Planaria belongs to phylum Platyhelminthes.
  • These are flatworms and has acoelomate body plan.
Hence, the correct option is D.
NCERT Reference: Topic Phylum – Platyhelminthes” of chapter Animal Kingdom
 
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Which phylum is a coelom and triploblastic animals?
  • a)
    Phylum Ctenophora
  • b)
    Phylum Annelida
  • c)
    Phylum Coelenterata
  • d)
    Phylum Porifera
Correct answer is option 'B'. Can you explain this answer?

Raghav Bansal answered
Annelida are aquatic (marine and freshwater) or terrestrial, free-living, and sometimes parasitic. They are bilateral symmetric and triploblastic.

A reptile having four chambered heart is
a)Snake
b)Salamander
c)Crocodile
d)Lizards
Correct answer is option 'C'. Can you explain this answer?

Prakhar Maheshwari answered
Except for crocodilians, which have a four-chambered heart, all reptiles have a three-chambered heart consisting of two atria and one ventricle.

What is the main excretory organ in insects?
  • a)
    Proboscis gland
  • b)
    Malphighian tubules
  • c)
    Gills
  • d)
    Excretory pore
Correct answer is option 'B'. Can you explain this answer?

Rajat Kapoor answered
Malpighian tubule
The Malpighian tubule system is a type of excretory and osmoregulatory system found in some insects, myriapods, arachnids, and tardigrades. The system consists of branching tubules extending from the alimentary canal that absorbs solutes, water, and wastes from the surrounding hemolymph.

Species going to extinct due to low reproductive rate is
  • a)
    Island sps
  • b)
    Bald eagle
  • c)
    Lion
  • d)
    Giant panda
Correct answer is option 'D'. Can you explain this answer?

Rajesh Datta answered
Giant panda is going to extinct due to low reproductively rate. They live in mountain ranges in central china. There reproductively rate is varyless due to climatic conditions.

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.

The excretory organ of Saccoglossus is
  • a)
    Malphighian tubules
  • b)
    Proboscis gland
  • c)
    Gills
  • d)
    Excretory pore
Correct answer is option 'B'. Can you explain this answer?

Pooja Mehta answered
A proboscis is an elongated appendage from the head of an animal, either a vertebrate or an invertebrate. In invertebrates, the term usually refers to tubular mouth parts used for feeding and sucking. In vertebrates, a proboscis is an elongated nose or snout.

How many chambers are there in camel’s stomach?Identify the animal given below. Mention its phylum.
  • a)
    1 chamber, Ascidia and phylum Chordata
  • b)
    3 Chamber, Spongilla and phylum Porifera
  • c)
    3 chambers, Euspongia and phylum Porifera
  • d)
    4 chamber, Aurelia and phylum Coelenterata
Correct answer is option 'C'. Can you explain this answer?

Shiksha Academy answered
Euspongia, which belongs to the phylum Porifera, is commonly known as a sponge. Sponges are some of the simplest and most primitive animals in the animal kingdom.
Hence, the correct option is C.
NCERT Reference: Topic: Phylum – Porifera” of chapter Animal Kingdom

Which group of chordates possesses sucking and circular mouth without jaws?
  • a)
    ClassChondrichthyes
  • b)
    Class Cyclostomata
  • c)
    Class Osteichthyes
  • d)
    Both (b) and (c) 
Correct answer is option 'B'. Can you explain this answer?

Pooja Mehta answered
 Class-Cyclostomata is comprised of, the living jawless fishes. Their mouth is circular and lack jaws, hence they are also called agnathans.  It is surrounded by tentacles (e.g., lampreys and hellish). These also presses retractable teeth.       

Animals which possess cleidoic egg exhibit
  • a)
    External fertilisation and external development
  • b)
    External fertilisation and internal development
  • c)
    Internal fertilisation and internal development
  • d)
    Internal fertilisation and external development
Correct answer is option 'D'. Can you explain this answer?

Rajeev Saxena answered
Cleidoic eggs are laid by reptiles & birds. These eggs have protective shell which is porous to air and may be flexible or calcareous (hard). Birds and reptiles exhibit internal fertilization and laid eggs contain all the food the embryo needs for external development. 

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.

Silk produced by Antheraea Mylitta is called
  • a)
    Eri silk
  • b)
    Muga silk
  • c)
    Mysore silk
  • d)
    Tasar silk
Correct answer is option 'D'. Can you explain this answer?

Rajat Kapoor answered
Tropical Tasar: Tasar (Tussah) is copperish colour, coarse silk mainly used for furnishings and interiors. It is less lustrous than mulberry silk, but has its own feel and appeal. Tasar silk is generated by the silkworm, Antheraea mylitta which mainly thrive on the food plants Asan and Arjun.

Air bladder is absent in
  • a)
    Sea horse
  • b)
    Shark
  • c)
    Flying fish
  • d)
    All of the above
Correct answer is option 'B'. Can you explain this answer?

Roshni Tiwari answered
Explanation:
Air bladder is a gas-filled sac that helps fish to maintain buoyancy in water. However, not all fish have air bladders. The correct answer to the given question is option B, i.e., shark, as sharks do not have air bladders.

Reasons why sharks do not have an air bladder are:

1. Buoyancy control: Sharks have a special organ called the liver that is filled with oil. This oil is less dense than water and provides buoyancy to the shark, allowing it to stay afloat.

2. Depth control: Unlike bony fish that have a swim bladder to adjust their depth in water, sharks are able to control their depth by swimming. They can swim at different angles to adjust their depth in water.

3. Adaptation to environment: Sharks have evolved to live in their environment, and their body shape and buoyancy control mechanisms have adapted to suit their needs.

Therefore, it can be concluded that while some fish have air bladders to maintain buoyancy in water, sharks have evolved different mechanisms to control their buoyancy and depth in water.

The phylum in which adults exhibit radial symmetry and larva exhibit bilateral symmetry is
  • a)
    Phylum Arthropoda
  • b)
    Phylum Echinodermata
  • c)
    Phylum Annelida
  • d)
    Phylum Aschelminthes
Correct answer is option 'B'. Can you explain this answer?

Jyoti Kapoor answered
 Symmetry is an attribute of an organism showing regularity in body parts on a plane or around an axis. In Phylum Echinodermata, the adult echinoderms are radially symmetrical but the larvae are bilaterally symmetrical. 

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.

 Sharks and dogfishes differ from skates and rays by [NEET Kar. 2013]
  • a)
    Their pectoral fins distinctly marked off from cyclindrical bodies
  • b)
    Gill slits are ventrally placed
  • c)
    Head and trunk are widened considerably
  • d)
    Distinct demarcation between body and tail
Correct answer is option 'A'. Can you explain this answer?

Janani Iyer answered
Difference between Sharks and Dogfishes from Skates and Rays

Sharks and dogfishes are a group of fishes that belong to the class Chondrichthyes. Skates and rays are also part of this class. However, there are some distinguishing characteristics that set sharks and dogfishes apart from skates and rays.

Distinctly Marked Pectoral Fins

One of the main differences between sharks and dogfishes from skates and rays is the distinct marking off of their pectoral fins from their cylindrical bodies. Sharks and dogfishes have paddle-like pectoral fins that are not fused to their bodies, which allow them to swim more efficiently. In contrast, skates and rays have flattened pectoral fins that are fused to their bodies.

Ventrally Placed Gill Slits

Sharks and dogfishes have gill slits that are ventrally placed, which means they are located on the underside of their bodies. This allows for more efficient breathing while swimming. Skates and rays, on the other hand, have gill slits that are located on the top of their bodies.

Considerably Widened Head and Trunk

Another difference between sharks and dogfishes from skates and rays is the considerably widened head and trunk. Sharks and dogfishes have a broad and flattened head that tapers towards the tail. This allows for greater maneuverability while swimming. Skates and rays have a flattened body that is wider towards the head and tapers towards the tail.

No Distinct Demarcation Between Body and Tail

Sharks and dogfishes also lack a distinct demarcation between their body and tail. Their tails are generally symmetrical and streamlined, allowing for efficient swimming. Skates and rays, on the other hand, have a distinct demarcation between their body and tail. Their tails are generally flattened and broad, which allows for efficient movement on the ocean floor.

In conclusion, sharks and dogfishes differ from skates and rays in several notable ways, including their distinctly marked pectoral fins, ventrally placed gill slits, considerably widened head and trunk, and lack of a distinct demarcation between body and tail.

Which of the following does not have an excretory system?
  • a)
    Carcharodon
  • b)
    Myxine
  • c)
    Asterias
  • d)
    Catla
Correct answer is option 'C'. Can you explain this answer?

Rajeev Sharma answered
Asterias does not have an excretory system.Asterias includes starfish or sea star. They are exclusively marine,

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.

Diploblastic and triplo blastic are terms that describe
  • a)
    the number of in vaginations during embryonic development
  • b)
    the number of heads during embryonic development
  • c)
    the number of germinal layers during embryonic development
  • d)
    the number of cell types during development
Correct answer is option 'C'. Can you explain this answer?

Pooja Mukherjee answered
Germinal Layers in Embryonic Development and Diploblastic/Triploblastic Classification

Embryonic development is a complex process that involves the formation of various tissues and organs from a single cell. During this process, the embryo undergoes several stages of development that are marked by the formation of germinal layers. Germinal layers are the layers of cells that differentiate into specific tissues and organs during embryonic development. These layers form the basis of the body plan of an organism and are classified as either diploblastic or triploblastic.

Diploblastic Organisms

Diploblastic organisms are those that have only two germinal layers: the ectoderm and endoderm. These layers are formed during gastrulation, which is the process by which the embryo folds in on itself to form a hollow ball of cells called the gastrula. In diploblastic organisms, the ectoderm gives rise to the outer layer of the body and the nervous system, while the endoderm gives rise to the inner layer of the body.

Examples of diploblastic organisms include cnidarians (e.g. jellyfish, corals, sea anemones) and ctenophores (comb jellies).

Triploblastic Organisms

Triploblastic organisms are those that have three germinal layers: the ectoderm, mesoderm, and endoderm. These layers are formed during gastrulation, but unlike in diploblastic organisms, the mesoderm layer is also formed. The mesoderm gives rise to the muscles, circulatory system, and other internal organs.

Examples of triploblastic organisms include most animals, including humans.

Conclusion

The diploblastic/triploblastic classification is based on the number of germinal layers that are present during embryonic development. Diploblastic organisms have two germinal layers (ectoderm and endoderm), while triploblastic organisms have three germinal layers (ectoderm, mesoderm, and endoderm). This classification is important for understanding the basic body plan of organisms and how different tissues and organs are formed during embryonic development.

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 statements is incorrect with regard to bilateral symmetry?
  • a)
    Body can be divided into two equal halves by a single plane only.
  • b)
    The organisms that show bilateral symmetry have paired body organs that occur on the two sides of a central axis.
  • c)
    It is found in all invertebrates and few vertebrates. 
  • d)
    Spider and crab show bilateral symmetry.
Correct answer is option 'C'. Can you explain this answer?

Poulomi Roy answered
Bilateral Symmetry

Bilateral symmetry refers to the arrangement of body parts in such a way that an organism can be divided into two equal halves by a single plane passing through the central axis of the body. This type of symmetry is found in many animals, especially invertebrates and some vertebrates.

Incorrect statement

The incorrect statement is option C, which states that bilateral symmetry is found in all invertebrates and few vertebrates. This statement is incorrect because bilateral symmetry is actually found in the majority of animals, both invertebrates, and vertebrates. Almost all animals belonging to the phyla Chordata, Arthropoda, Mollusca, and Annelida exhibit bilateral symmetry.

Examples of animals with bilateral symmetry

- Invertebrates like insects, crustaceans, spiders, and worms exhibit bilateral symmetry.
- Vertebrates like fish, amphibians, reptiles, birds, and mammals exhibit bilateral symmetry.

Advantages of bilateral symmetry

Bilateral symmetry provides several advantages to animals:

- It allows for more efficient movement and coordination since paired limbs and muscles can work together to produce more precise movements.
- It facilitates the development of specialized organs and structures, such as eyes and ears, that are paired and located on opposite sides of the body.
- It enables animals to have directional movement, since paired limbs can be used to move forward or backward, up or down, and left or right.

Conclusion

Bilateral symmetry is a common type of symmetry found in the majority of animals, both invertebrates, and vertebrates. It allows for more efficient movement and coordination, facilitates the development of specialized organs and structures, and enables directional movement.

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.

Chapter doubts & questions for Animal Kingdom - 4 Months Preparation for NEET 2025 is part of NEET exam preparation. The chapters have been prepared according to the NEET exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for NEET 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.

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