Explore Exams
Login Signup
Sign in Open App
All Exams  >   NEET  >   NCERT Based Tests for NEET  >   All Questions

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
 
Clear all your doubts with EduRev

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.

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. 

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.

Protochordates are not vertebrates as : -
  • a)
    Notochord absent                
  • b)
    Vertebral column absent
  • c)
    Nerve cord absent
  • d)
    None of the above
Correct answer is option 'B'. Can you explain this answer?

Arjun Singhania answered
The members of sub-phylum - Vertebrata possess notochord during the embryonic stage. But in adults the notochord is replaced by a cartilaginous or bony vertebral column.Thus, the absence of notochord in adult vertebrates suggest that all vertebrates are chordates but all chordates are not vertebrates.

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. 

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,

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.

Amphibians are the first tetrapods to invade the land. The juvenile phase of the life cycle is dependent on water, where gas exchange occurs through gills. Amphibians have aquatic larval life and terrestrial adult life. Respiration is by gills, lungs and skin. Their body is divisible into head and trunk and skin is moist without scales. The two pairs of limbs are used for locomotion except for caecilians. They are cold blooded animals. Respiration is by gills (in larva), lungs and skin (in adults). Amphibians have a three-chambered heart. Fertilisation is external. However, in Salamander and Ichthyophis fertilization is internal. They are mostly oviparous, except for Salamander, which is viviparous. Development is indirect.
Q. In some amphibians even after attaining sexual maturity, larval characters are retained. It is known as _______.
  • a)
    Phylogenesis
  • b)
    Neoteny
  • c)
    Parthenogenesis
  • d)
    Ontogenesis
Correct answer is option 'B'. Can you explain this answer?

Dev Patel answered
It is the retention of juvenile features in the adult animal, or the sexual maturity of an animal while it is still is a larval state.

In Amphioxus notochord is present only  in :-
  • a)
    In embryo
  • b)
    In adult
  • c)
    Both
  • d)
    None of these
Correct answer is option 'C'. Can you explain this answer?

Anirudh Gupta answered
Chordata - Vertebrates, Tunicates, Lancelets. At some point, all of the organisms in this phylum have a structure called a notochord. A notochord is a flexible rod-like cord of cells that provides the main support for the organism's body during its embryonic stage. Chordates also have pharyngeal slits.

Directions : In the following questions a statement of Assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion : Excretory organs are absent in phylum Platyhelminthes.
Reason : Flame cells are the respiratory organs of Platyhelminthes.
  • a)
    Both Assertion (A) and reason (R) are true and reason (R) is the correct explanation of Assertion (A).
  • b)
    Both Assertion (A) and reason (R) are true but reason (R) is not the correct explanation of Assertion (A).
  • c)
    Assertion (A) is true but reason (R) is false.
  • d)
    Assertion (A) is false but reason (R) is true.
Correct answer is option 'D'. Can you explain this answer?

Dev Patel answered
Flame cells are the excretory organs of Platyhelminthes and other related animals which possess flickering cilia or flagella for driving the excretory products.

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 of the following is NOT a characteristic feature of the phylum Platyhelminthes?
  • a)
    Bilateral symmetry
  • b)
    Presence of a coelom
  • c)
    Organ-level organization
  • d)
    Acoelomate body plan
Correct answer is option 'B'. Can you explain this answer?

Janani Singh answered
Characteristics of Platyhelminthes
Platyhelminthes, commonly known as flatworms, exhibit several unique characteristics that distinguish them from other animal phyla. Here’s a breakdown of their traits:
1. Bilateral Symmetry
- Platyhelminthes display bilateral symmetry, meaning their body plan is symmetrical along a single plane. This feature allows for a streamlined body structure, which is advantageous for movement.
2. Organ-Level Organization
- These organisms possess an organ-level organization, with specialized tissues forming organs that perform specific functions. This complexity enables more efficient physiological processes compared to simpler forms of life.
3. Acoelomate Body Plan
- Flatworms are classified as acoelomates, meaning they lack a true coelom (body cavity) between the digestive tract and the outer body wall. Instead, their body is filled with parenchyma, a type of tissue.
4. Absence of a Coelom
- The key distinction for this question is the presence of a coelom. Unlike coelomates (organisms with a true coelom), Platyhelminthes do not have this feature. This absence is a defining characteristic of the phylum.
Conclusion
Therefore, option 'B', which states the presence of a coelom, is NOT a characteristic feature of the phylum Platyhelminthes. This clarification helps in understanding the fundamental biological classifications and characteristics of different animal groups.

Read the given statements and select the correct option.
Statement 1: All triploblastic animals are eucoelomates.
Statement 2: They have a false coelom.
  • a)
    Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.
  • b)
    Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.
  • c)
    Statement 1 is correct and statement 2 is incorrect. 
  • d)
    Both statements 1 and 2 are incorrect.
Correct answer is option 'D'. Can you explain this answer?

Geetika Shah answered
  • Animals that belong to the phylum Platyhelminthes to Chordata are all triploblastic.
  • But Platyhelminthes and aschelminthes belong to pseudocoelomates.
  • Annelids, arthropods, echinoderms and chordates are under eucoelomates. This means not all triploblastic animals are eucoelomates. 
  • Pseudocoelomates have false coelom while eucoelomate animals only have the true coelom. 
Hence, both statement 1 and statement 2 are incorrect. 

Stomochord (Buccal diverticulum) is present in : - 
  • a)
    Amphioxus
  • b)
    Herdmania
  • c)
    Balanoglossus
  • d)
    None
Correct answer is option 'C'. Can you explain this answer?

Geetika Shah answered
Hemichordata closely relates the Chordates. It contains marine deuterostome animals. They have a tubular structure known as stomochords. Stomochords arise in embryonic development as an out-pocketing from the roof of the embryonic gut anterior to the pharynx. In adults, they extend dorsally from the pharynx into the proboscis and serve to communicate with the oral cavity. Their walls are composed primarily of epithelial cells, but ciliated and glandular cells are also present.Balanoglossus belongs to the Hemichordata phylum. So, it has buccal diverticulum.
So, the correct answer is option C.

Read the following statements:

i) Spider and mosquito possess compound eye
ii) Jelly fishes possess cnidoblasts but comb-jellies lack them.
iii) All animals having true coelom are characterized by the presence of bilateral symmetry usually, tube-within-tube body plan, presence of mesoderm and true segmentation
iv) The animals of the phylum Porifera have originated from colonial protozoans.

Which of the above statements are correct?
  • a)
    i, ii, iv
  • b)
    iii, iv
  • c)
    i, iii
  • d)
    ii, iii
Correct answer is option 'A'. Can you explain this answer?

Stepway Academy answered
i) Spider and mosquito possess compound eyes. The eyes of most insects, which are composed of many light-sensitive elements, each having its own reflective system and each forming a portion of an image.
ii) Jelly fishes possess cnidoblasts but comb-jellies lack them. Cnidoblasts are features of Coelenterata (Cnidaria) and comb-jellies come under the phylum Ctenophora.
iii) All animals with a true coelom usually exhibit bilateral symmetry, a tube-within-tube body plan, presence of mesoderm, and true segmentation.
iv) The animals of the phylum Porifera have indeed originated from colonial protozoans.
Thus, the correct statements are i, ii, and iv. The answer is Option A.

Vertebrates and tunicates share
  • a)
    Jaws adapted for feeding
  • b)
    A high degree of cephalisation
  • c)
    A notochaord and a dorsal, hollow nerve cord
  • d)
    The formation of structures from the neural crest
Correct answer is option 'C'. Can you explain this answer?

Nandini Iyer answered
The dorsal hollow nerve cord is part of the chordate central nervous system. In vertebrate fishes, the pharyngeal slits become the gills. Humans are not chordates because humans do not have a tail. Vertebrates do not have a notochord at any point in their development; instead, they have a vertebral column.

Select the correct matching of animals, their symmetry, organisation and coelom type.
  • a)
    a
  • b)
    b
  • c)
    c
  • d)
    d
Correct answer is option 'C'. Can you explain this answer?

Yashvi Khanna answered
Correct Matching Explained
The correct answer is option 'C', as it accurately matches the animals with their corresponding symmetry, organization, and coelom type.
Animal Categories and Their Characteristics
- Ctenophores
- Symmetry: Radial
- Organisation: Diploblastic
- Coelom Type: Coelomates (not Pseudocoelomates)
- Echinoderms
- Symmetry: Bilateral (larval stage) and Radial (adult stage)
- Organisation: Triploblastic
- Coelom Type: Coelomates
- Platyhelminthes
- Symmetry: Bilateral
- Organisation: Triploblastic
- Coelom Type: Acoelomates
- Annelids
- Symmetry: Bilateral
- Organisation: Triploblastic
- Coelom Type: Coelomates (not Diploblastic)
Detailed Breakdown of Option 'C'
- Platyhelminthes
- These organisms, commonly known as flatworms, exhibit bilateral symmetry which allows for more complex movement and organization.
- They are triploblastic, meaning they have three germ layers: ectoderm, mesoderm, and endoderm.
- Importantly, they are classified as acoelomates, lacking a true coelom, which differentiates them from other triploblastic groups.
Conclusion
The other options provided contain inaccuracies regarding the animals' symmetry, organization, or coelom type. Thus, option 'C' is indeed the correct choice, effectively aligning Platyhelminthes with bilateral symmetry, triploblastic organization, and acoelomate structure.

The members of phylum Annelida are known as “the segmented worms”. Their body is metamerically segmented. They are triploblastic and coelomate animals. The excretory units of these invertebrates are coiled tubules, the nephridia. They help in osmoregulation.
Example: Nereis, Pheretima and Hirudinaria. Body
Symmetry: Segmented worms have the typical metameric segmentation. Their body consists of segments called somites or metameres and ring like grooves known as annuli. They have bilateral symmetry.
Mode of Respiration: Respiration in annelids occurs through the skin. In some, gills are present.
Q. Metamerism is characteristic of __________.
  • a)
    Porifera
  • b)
    Platyhelminthes
  • c)
    Annelida
  • d)
    Mollusca
Correct answer is option 'D'. Can you explain this answer?

Priya Menon answered
In some animal like earthworms the body is divided into similar segments with a serial repetition of some organs. This is called metamerism.

Cranium is absent in : -
  • a)
    Protochordata
  • b)
    Vertebrata
  • c)
    Craniata
  • d)
    All the above
Correct answer is option 'A'. Can you explain this answer?

Aryan Nambiar answered
Explanation:
The cranium is a bony structure that encloses and protects the brain in vertebrates. It is a part of the skull and is typically found in vertebrates. However, it is absent in protochordates.

Protochordates:
Protochordates are the group of animals that includes phylum Chordata but excludes the vertebrates. They are primitive chordates and include animals like lancelets and tunicates. These animals have a notochord, which is a flexible rod-like structure that provides support, but they lack a cranium.

Vertebrates:
Vertebrates are animals that have a backbone or vertebral column. They are a subphylum of Chordata and include animals like fishes, amphibians, reptiles, birds, and mammals. All vertebrates have a cranium, which is a protective structure that surrounds and supports the brain.

Craniates:
Craniates are a group of animals that have a cranium. This group includes all vertebrates as well as some extinct animals. The cranium is a defining characteristic of craniates and is absent in protochordates.

Conclusion:
The cranium is absent in protochordates but present in vertebrates and craniates. Therefore, the correct answer is option 'A' - Protochordata.

Which one of the following statements is incorrect about the occurrence of notochord? ​
  • a)
    It is present only in larval tail in ascidian.
  • b)
    It is replaced by a vertebral column in adult frog.
  • c)
    It is absent throughout life in humans from the very beginning.
  • d)
    It is present throughout life in Amphioxus.
Correct answer is option 'C'. Can you explain this answer?

Mira Joshi answered
Humans belong to the phylum Chordata. Animals belonging to the phylum Chordata possess a notochord either during early embryonic life or throughout the embryonic life. In some, it is replaced by vertebral column. In humans, notochord is present only in the embryonic stage, it is replaced by vertebral column in the adult form.

Which one of the following is a matching pair of a body feature and the animal possessing it?
  • a)
    Ventral central nervous system - Leech
  • b)
    Pharyngeal gill slits absent in embryo - Chameleon
  • c)
    Ventral heart - Scorpion
  • d)
    Post-anal tail - Octopus
Correct answer is option 'A'. Can you explain this answer?

Janhavi Desai answered
Matching Body Feature and Animal Possessing It

Body features are specific characteristics that distinguish one animal from another. Here, we are identifying the correct matching pair of body features and the animal possessing it.

Ventral Central Nervous System - Leech

- The ventral central nervous system is a characteristic feature of the leech.
- The leech belongs to the phylum Annelida, which is characterized by segmented bodies.
- The nervous system of the leech is ventral, which means that it is located on the underside of the body.
- The ventral nerve cord of the leech runs the length of the body and is composed of ganglia (clusters of nerve cells) connected by nerves.
- The ventral central nervous system of the leech is responsible for coordinating movement and other bodily functions.

Pharyngeal Gill Slits Absent in Embryo - Chameleon

- The chameleon belongs to the class Reptilia, which is characterized by the absence of pharyngeal gill slits in the embryo.
- Pharyngeal gill slits are a characteristic feature of chordates, which includes vertebrates.
- In the embryo of chordates, pharyngeal gill slits develop into structures such as gills, jaws, and ears.
- However, in reptiles such as chameleons, these structures do not develop from pharyngeal gill slits.

Ventral Heart - Scorpion

- The ventral heart is a characteristic feature of the scorpion.
- The scorpion belongs to the class Arachnida, which is characterized by the presence of a ventral heart.
- The ventral heart of the scorpion is located on the underside of the body, between the cephalothorax and the abdomen.
- The ventral heart of the scorpion is made up of a series of muscular chambers that pump blood throughout the body.

Post-Anal Tail - Octopus

- The post-anal tail is a characteristic feature of some animals, such as fish and amphibians, but not of octopuses.
- Octopuses belong to the class Cephalopoda, which is characterized by the absence of a post-anal tail.
- Octopuses are marine animals with eight arms and no tail.
- The lack of a post-anal tail in octopuses is related to their mode of movement, which involves jet propulsion through water using a muscular mantle cavity.

Therefore, the correct matching pair of body feature and animal possessing it is:

a) Ventral central nervous system - Leech.

Chordates are distinguished from non chordates by the presence of : -
  • a)
    Brain
  • b)
    Dorsal tubular hollow nerve cord
  • c)
    Ventral nerve cord
  • d)
    Dorsal solid nerve cord
Correct answer is option 'B'. Can you explain this answer?

Varun Chakraborty answered
Differentiation of Chordates from Non-Chordates
Chordates and non-chordates represent two major classifications in the animal kingdom. The defining characteristics of chordates set them apart from non-chordates.

Key Characteristic: Dorsal Tubular Hollow Nerve Cord
- Chordates possess a **dorsal tubular hollow nerve cord**, which is a crucial feature during their embryonic development.
- This structure is located along the back (dorsal side) of the organism and is responsible for the central nervous system's formation, which includes the brain and spinal cord.

Importance of the Dorsal Nerve Cord
- The dorsal tubular nerve cord differentiates chordates from non-chordates, which typically have a **ventral solid nerve cord**.
- This dorsal position allows for better protection and integration of sensory information, contributing to the evolution of more complex nervous systems in chordates.

Additional Features of Chordates
- Aside from the dorsal hollow nerve cord, chordates are characterized by other features, such as:
- **Notochord**: A flexible rod providing support.
- **Pharyngeal slits**: Openings in the throat area, which may develop into gills in aquatic species.
- **Post-anal tail**: An extension of the body beyond the anal opening, aiding in locomotion.

Conclusion
In summary, the presence of a **dorsal tubular hollow nerve cord** is a distinct and vital feature that distinguishes chordates from non-chordates, contributing to their complexity and evolutionary advancements. Understanding this characteristic is essential for students preparing for exams like NEET.

Protochordates are : -
  • a)
    Mucous feeders 
  • b)
    water current feeders
  • c)
    Ciliary feeders
  • d)
    Predators
Correct answer is option 'C'. Can you explain this answer?

Jayant Mishra answered
Ciliary feeding A method of feeding used by lancelets and many other aquatic invertebrates. The movement of cilia causes a current of water to be drawn towards and through the animal, and microorganisms in the water are filtered out by the cilia. "ciliary feeding." A Dictionary of Biology. . "ciliary feeding."

Amphibians are the first tetrapods to invade the land. The juvenile phase of the life cycle is dependent on water, where gas exchange occurs through gills. Amphibians have aquatic larval life and terrestrial adult life. Respiration is by gills, lungs and skin. Their body is divisible into head and trunk and skin is moist without scales. The two pairs of limbs are used for locomotion except for caecilians. They are cold blooded animals. Respiration is by gills (in larva), lungs and skin (in adults). Amphibians have a three-chambered heart. Fertilisation is external. However, in Salamander and Ichthyophis fertilization is internal. They are mostly oviparous, except for Salamander, which is viviparous. Development is indirect.
Direction : In the following questions the Assertions (A) and Reasons (R) have been put forward. Read both the statements and choose the correct option from the following:
Assertion : Amphibians usually hibernate in winter and undergo aestivation in summer.
Reason : They are poikilothermic animals.
  • a)
    Both A and R are true, and R is the correct explanation of A.
  • b)
    Both A and R are true, but R is not the correct explanation of A.
  • c)
    A is true but R is false.
  • d)
    A is false but R is true.
Correct answer is option 'A'. Can you explain this answer?

Dev Patel answered
Amphibians are cold blooded animal. They can not regulate their body temperature with changing environment.

Match each item in Column I with one item in Column II and choose your answer from the codes given below.

Column I | Column II
I. Placoid Scales | 1. Chondrichthyes
II. Ctenoid scales | 2. Osteichthyes
III. Ectoparasites | 3. Hemichordata
IV. Proboscis gland | 4. Cyclostomata

Codes:
  • a)
    1 2 3 4
  • b)
    2 1 4 3
  • c)
    2 1 3 4
  • d)
    1 2 4 3
Correct answer is option 'D'. Can you explain this answer?

EduRev NEET answered
Placoid Scales are characteristic of Chondrichthyes (cartilaginous fishes).
Ctenoid Scales are characteristic of Osteichthyes (bony fishes).
Ectoparasites are typically associated with Cyclostomata (e.g., lampreys).
Proboscis gland is a feature of Hemichordata (e.g., acorn worms).
Thus, the correct code is Option D: 1 2 4 3.

Directions : In the following questions a statement of Assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion : Birds are oviparous.
Reason : Oviparous animals give birth to young ones of their own kind.
  • a)
    Both Assertion (A) and reason (R) are true and reason (R) is the correct explanation of Assertion (A).
  • b)
    Both Assertion (A) and reason (R) are true but reason (R) is not the correct explanation of Assertion (A).
  • c)
    Assertion (A) is true but reason (R) is false.
  • d)
    Assertion (A) is false but reason (R) is true.
Correct answer is option 'C'. Can you explain this answer?

Yashvi Joshi answered
Assertion: Birds are oviparous.
Reason: Oviparous animals give birth to young ones of their own kind.

The correct answer is option C - Assertion (A) is true but reason (R) is false.

Explanation:

Assertion (A): Birds are oviparous.
Birds are indeed oviparous, which means they lay eggs to reproduce. This is a well-known fact about birds and is supported by scientific evidence. All bird species lay eggs as part of their reproductive process.

Reason (R): Oviparous animals give birth to young ones of their own kind.
The reason provided is incorrect. Oviparous animals do lay eggs, but the statement that they give birth to young ones of their own kind is not accurate. Oviparous animals produce offspring through the process of laying eggs, and these eggs then hatch to give rise to the young ones. The offspring are not born in the same way as in viviparous animals, which give live birth.

In the case of birds, they lay eggs that contain the developing embryo. The eggs are incubated by the parents until they hatch, and the hatchlings are considered the young ones. These hatchlings are of the same species as their parents, but they are not "born" in the same way as mammals or other viviparous animals.

Therefore, while the assertion that birds are oviparous is true, the reason provided is false. The reason incorrectly suggests that oviparous animals give birth to young ones, which is not the case.

In conclusion, birds are indeed oviparous, but the reason provided is incorrect. Hence, the correct answer is option C - Assertion (A) is true but reason (R) is false.

Directions : In the following questions a statement of Assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion : Cnidarians, Ctenophorans, and Echinodermates show radial symmetry.
Reason : Their body can be divided into two equal halves by cutting it in any plane passing through the central axis.
  • a)
    Both Assertion (A) and reason (R) are true and reason (R) is the correct explanation of Assertion (A).
  • b)
    Both Assertion (A) and reason (R) are true but reason (R) is not the correct explanation of Assertion (A).
  • c)
    Assertion (A) is true but reason (R) is false.
  • d)
    Assertion (A) is false but reason (R) is true.
Correct answer is option 'A'. Can you explain this answer?

Dev Patel answered
Cnidarians, ctenophorans, and echinodermates show radial symmetry because their body can be divided into two equal halves by cutting it in any plane passing through the central axis.

What is common between parrot, platypus and kangaroo?
  • a)
    Toothless jaws
  • b)
    Functional postanal tail
  • c)
    Oviparity
  • d)
    Homoiothermy
Correct answer is option 'D'. Can you explain this answer?

Nisha Datta answered
Common Features of Parrot, Platypus, and Kangaroo

Homoiothermy
- All three animals are homoiothermic or warm-blooded.
- They are able to maintain a constant body temperature regardless of the external temperature.
- This allows them to live in a variety of environments and adapt to changing conditions.

Differences among Parrot, Platypus, and Kangaroo

Toothless Jaws
- Parrots have a toothless beak that is adapted for cracking seeds and nuts.
- Platypuses have a toothless bill that is used to detect prey in the water.
- Kangaroos have teeth that are adapted for grazing on grass and plants.

Functional Postanal Tail
- Platypuses have a flat, broad tail that is used for swimming.
- Kangaroos have a long, muscular tail that helps them balance and jump.
- Parrots do not have a postanal tail.

Oviparity
- Platypuses are oviparous, which means they lay eggs.
- Kangaroos are marsupials and give birth to relatively undeveloped young that continue to develop in the mother's pouch.
- Parrots lay eggs and incubate them until they hatch.

In conclusion, although parrots, platypuses, and kangaroos share the common feature of homoiothermy, they differ in terms of their toothless jaws, functional postanal tail, and method of reproduction.

Which one of the following statements about all the four of Spongila, leech, dolphin and penguin is correct?
  • a)
    Penguin is homeothermic while the remaining three are poikilothermic.
  • b)
    Leech is a fresh water form while all others are marine.
  • c)
    Spongilla has special collared cells called choanocytes, not found in the remaining three.
  • d)
    All are bilaterally symmetrical.
Correct answer is option 'C'. Can you explain this answer?

Kunal Nambiar answered
The correct answer is option 'C': Spongilla has special collared cells called choanocytes, not found in the remaining three.

Explanation:
- Spongilla is a genus of freshwater sponge, while leech, dolphin, and penguin belong to different animal groups.
- The statement mentions that Spongilla has special collared cells called choanocytes, which are not found in the remaining three organisms.
- Choanocytes: Choanocytes are specialized cells found in sponges. They have a collar-like structure with a flagellum projecting from the center. These cells help in creating water currents and capturing food particles.
- Spongilla, being a freshwater sponge, relies on choanocytes for filter-feeding.
- In contrast, leeches are segmented worms, dolphins are marine mammals, and penguins are flightless birds. These organisms do not possess choanocytes.
- The other statements in the options are incorrect:
- Option 'A': Penguins are not homeothermic; they are actually endothermic, meaning they can generate and regulate their own body heat. The remaining three organisms (Spongilla, leech, and dolphin) are poikilothermic, meaning their body temperature is dependent on external factors.
- Option 'B': Leeches can be found in both freshwater and marine environments. Dolphins are marine mammals, penguins inhabit marine and terrestrial habitats, while Spongilla is a freshwater sponge.
- Option 'D': Although all the mentioned organisms are bilaterally symmetrical, this statement is not specific to only these four organisms and can be true for many other animals as well.

In summary, the correct statement is that Spongilla has special collared cells called choanocytes, which are not found in leech, dolphin, and penguin.

Chapter doubts & questions for Animal Kingdom - NCERT Based Tests 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.

Chapter doubts & questions of Animal Kingdom - NCERT Based Tests for NEET in English & Hindi are available as part of NEET exam. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free.

Top Courses NEET

Related NEET Content

© EduRev
Education Revolution
Signup to see your scores go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup