Q. Which of the following is a basic feature of all the organisms of Animalia? [Pg-46,E]
A
Multicellular structure
B
Sensory and neuromotor system
C
Terrestrial habitat
D
Locomotion
Explanation
All members of Kingdom Animalia are multicellular eukaryotes and heterotrophic in nature. While sensory systems, terrestrial habitats, and locomotion are present in many, multicellularity is a fundamental defining feature of all animals.
Q. Which of the following lack tissue grade organization? [Pg-46,E]
A
Metazoans
B
Eumetazoans
C
Parazoans
D
None of these
Explanation
Parazoans (such as sponges of Phylum Porifera) lack true tissues and exhibit a cellular level of organization. Eumetazoans have well-defined tissues, organs, or organ systems.
Q. Match the columns and choose the correct option: [Pg-46,47,M]
Column-I (Level of Organization) Column-II (Example Animal)
(A) Organ level (1) Pheretima
(B) Cellular aggregate level (2) Fasciola
(C) Tissue level (3) Spongilla
(D) Organ system level (4) Obelia
A
A-2, B-4, C-3, D-1
B
A-2, B-3, C-4, D-1
C
A-4, B-1, C-2, D-3
D
A-1, B-2, C-3, D-4
Explanation
Organ level of organization is found in Fasciola (liver fluke, Platyhelminthes). Cellular aggregate level is in Spongilla (sponge). Tissue level is in Obelia (coelenterate). Organ system level is in Pheretima (earthworm, Annelida).
Q. Choose the correct option regarding digestive and organ systems: [Pg-47,H]
A
Ctenophores and platyhelminthes possess complete digestive system.
B
Aschelminthes to chordates, all possess organ system level of organization along with complete digestive system.
C
Coelenterates and aschelminthes possess organ system level of organization along with complete digestive system.
D
Poriferans may possess complete digestive system.
Explanation
From Phylum Aschelminthes to Chordata, all organisms possess organ-system level of body organization and a complete digestive system with two separate openings (mouth and anus).
Q. The entry of food and exit of waste takes place from separate openings in: [Pg-47,M]
A
organisms having incomplete digestive system
B
coelenterates, ctenophores and Platyhelminthes
C
organisms having complete digestive system
D
organisms having cellular level of organization
Explanation
A complete digestive system has two openings, a mouth and an anus, allowing the entry of food and exit of waste to occur through separate passages.
Q. Which of the following statements is incorrect regarding division of labour? [Pg-47,M]
A
Some division of labour (activities) occur among the cells in the members of phylum porifera.
B
Division of labour (activities) is completely absent among the cells in poriferans.
C
Open circulatory system is found in Tunicates, hemichordates, and non-cephalopod molluscs.
D
All of these
Explanation
Division of labour is not completely absent in poriferans; rather, they exhibit a cellular level of organization where some basic division of labour exists among different types of specialized cells.
Q. Choose the incorrect option regarding the circulatory/digestive systems: [Pg-47,M]
A
Complete digestive system - Two openings, mouth and anus
B
Incomplete digestive system - Single opening system
C
Open circulatory system - Blood is circulated through tubes
D
Closed circulatory system - Arteries veins and capillaries present
Explanation
In an open circulatory system, blood is pumped by the heart into body cavities (sinuses) where tissues are directly bathed; it is not confined to closed tubes/vessels like arteries and capillaries.
Q. Choose the correct body symmetry shown in the diagrams of Hydra (A) and a Crab (B): [Pg-47,E]
A
A – Radial, B – Bilateral
B
A – Bilateral, B – Pentamerous
C
A – Radial, B – Pentamerous
D
A – Bilateral, B – Radial
Explanation
Hydra (Coelenterata) exhibits radial symmetry (any plane passing through the central axis divides the body into identical halves), while the Crab (Arthropoda) exhibits bilateral symmetry (only one plane divides it into identical left and right halves).
Q. The diagram shows diploblastic and triploblastic germ layers in animals. Identify the correct animal groups in which they are found respectively: [Pg-47,E]
A
A – Molluscs, B – Chordates
B
A – Annelida, B – Porifera
C
A – Coelenterates, B – Platyhelminthes
D
A – Molluscs, B – Porifera
Explanation
Diploblastic layers (having ectoderm and endoderm separated by mesoglea) are found in coelenterates and ctenophores. Triploblastic layers (having mesoderm as well) are found in animals from Platyhelminthes to Chordates.
Q. Choose the true statement regarding animal body symmetry: [Pg-47,M]
A
Animals like annelids, arthropods, aschelminthes, molluscs, hemichordates and chordates possess bilateral symmetry.
B
Most of the animals possess bilateral symmetry.
C
Platyhelminthes was the first phylum during evolution to exhibit bilateral symmetry.
D
All of these
Explanation
Bilateral symmetry is highly prevalent in the animal kingdom, starting from Platyhelminthes all the way through Chordata (with secondary radial symmetry in adult echinoderms).
Q. Study the types of coelom/body cavity in animals. Identify the correct categories represented by diagram A (true coelom) and B (pseudocoelom) respectively: [Pg-48,E]
A
A – Coelomates, B – Pseudocoelomates
B
A – Pseudocoelomates, B – Coelomates
C
A – Acoelomates, B – Coelomates
D
A – Coelomates, B – Acoelomates
Explanation
A represents Coelomates (where the body cavity is fully lined by mesoderm, e.g., annelids, molluscs, chordates) and B represents Pseudocoelomates (where mesoderm is present as scattered pouches, e.g., Aschelminthes).
Q. Which of the following options is wrong? [Pg-47,M]
A
Coelenterates and ctenophores are diploblastic.
B
Animals from platyhelminthes to chordates are triploblastic.
C
Radially symmetric animals remain attached to a surface by their aboral surface.
D
Mesoglea is an undifferentiated layer which do not form any tissue or organ.
Explanation
Not all radially symmetric animals are sessile or attached (e.g., adult jellyfish are free-swimming ctenophores/cnidarians), so the statement is biologically incorrect.
Q. Choose the incorrect match regarding body plans: [Pg-47,M]
A
Tube-within-tube body plan: Nemathelminthes, Annelida, Arthropoda, Mollusca, Echinodermata, Chordata
B
Cell-aggregate type body plan: Coelenterates
C
Blind-sac type body plan: Platyhelminthes and coelenterates
D
None of these
Explanation
Poriferans (sponges) have a cell-aggregate type body plan. Coelenterates have a blind-sac type body plan where the digestive cavity has only a single opening acting as both mouth and anus.
Q. Which of the following is/are the function of coelom? [Pg-48,H]
A
Absorb shock or provide hydrostatic skeleton
B
Support shock or provide hydrostatic skeleton
C
Allow muscles to grow independently of the body wall
D
All of these
Explanation
The coelom cushions internal organs against shock, acts as a hydrostatic skeleton in soft-bodied animals, and allows internal organs/muscles to move and grow independently of the outer body wall.
Q. The diagram shows diploblastic and triploblastic germ layers. Identify the correct animal groups representing diploblastic (A) and triploblastic (B) layers: [Pg-47,E]
A
A – Coelenterates, B – Platyhelminthes
B
A – Platyhelminthes, B – Coelenterates
C
A – Porifera, B – Coelenterates
D
A – Chordates, B – Molluscs
Explanation
Coelenterates possess a diploblastic layer (ectoderm and endoderm only). Platyhelminthes onwards possess a triploblastic organization with ectoderm, endoderm, and mesoderm.
Q. Choose the incorrect option regarding body cavities: [Pg-48,H]
A
True coelom is a body cavity which arises as a cavity in the embryonic mesoderm.
B
Digestive cavity is found in acoelomates, pseudocoelomates as well as coelomates.
C
The body cavity of arthropods and non-cephalopod molluscs is called haemocoel.
D
There is no cavity between the body wall and gut wall in echinoderms.
Explanation
Echinoderms are coelomate animals with a well-developed, mesoderm-lined coelom/body cavity between the body wall and gut wall.
Q. Metamerism is present in which of the following groups? [Pg-48,E]
A
annelids
B
arthropods
C
chordates
D
all of these
Explanation
True metamerism (segmented body structure where at least some organs are serially repeated) is present in three phyla: Annelida, Arthropoda, and Chordata.
Q. Choose the incorrect match regarding biological features: [Pg-47,E]
A
Coelenterates – Radial symmetry
B
Molluscs – Radial symmetry in adults
C
Platyhelminthes – Triploblastic
D
Ctenophores – Triploblastic
Explanation
Ctenophores are diploblastic, not triploblastic. Cnidarians/Coelenterates and Ctenophores have ectoderm and endoderm but lack mesoderm.
Q. In the broad classification of Kingdom Animalia based on fundamental features, identify labels A, B, C, and D:
- A represents Symmetry type of Eumetazoa
- B represents Phylum under Cellular level of organization
- C represents Phylum under Tissue/Organ level with Radial Symmetry
- D represents Phylum under Bilateral Bilateral symmetry with Acoelomate condition
A
A - Bilateral, B - Porifera, C - Ctenophora, D - Coelomate
B
A - Radial, B - Porifera, C - Ctenophora, D - Acoelomate
C
A - Bilateral, B - Porifera, C - Ctenophora, D - Coelomate
D
A - Radial, B - Ctenophora, C - Porifera, D - Acoelomate
Explanation
In standard Animal Kingdom classification: A = Radial symmetry branch, B = Porifera (cellular level), C = Ctenophora/Coelenterata (radial symmetry), and D = Acoelomate (bilateral symmetry with no coelom, i.e., Platyhelminthes).
Q. Choose the incorrect statement regarding notochord: [Pg-48,M]
(I) Notochord is ectodermally derived rod-like structure.
(II) Notochord is formed on the dorsal side during embryonic development.
(III) The animals from porifera to Echinoderms are without notochord.
(IV) In some chordates, notochord is replaced by the vertebral column and these chordates are called vertebrates.
A
I and II
B
I, II, and III
C
II, III and IV
D
I only
Explanation
Notochord is mesodermal in origin, not ectodermal. Therefore, only statement I is incorrect.
Q. Identify the correct labels A and B in the table comparing Notochord and Nerve Cord:
Notochord: A (Endoskeleton/Exoskeleton)
Nerve Cord: B (Dorsal side in chordates / Ventral side in chordates)
A
A = Exoskeleton, B = Dorsal in chordates as well as in non-chordates
B
A = Endoskeleton; B = Ventral in chordates as well as in non-chordates
C
A = Exoskeleton; B = Ventral in chordates and dorsal in nonchordates
D
A = Endoskeleton; B = Dorsal in chordates and ventral in nonchordates
Explanation
Notochord is a mesodermally derived endoskeletal structure. In chordates, the nerve cord is dorsal, hollow, and single, whereas in non-chordates it is ventral, solid, and double.
Q. True coelom appeared in which of the following during evolution? [Pg-48,E]
A
Echinodermata
B
Annelida
C
Platyhelminthes
D
Aschelminthes
Explanation
Annelids were the first animals to evolve a true coelom (coelomates) lined by embryonic mesoderm on both sides.
Q. The layer absent in the embryos of diploblastic animals is: [Pg-47,E]
A
ectoderm
B
endoderm
C
mesoderm
D
mesoglea
Explanation
Diploblastic animals have ectoderm and endoderm, with an intermediate undifferentiated non-cellular layer called mesoglea. They lack mesoderm.
Q. Nerve cells and tissue level of organization first appeared in: [Pg-46,E]
A
coelenterates
B
ctenophora
C
chordate
D
porifera
Explanation
Nerve cells and a coordinated tissue level of organization first evolved in Phylum Coelenterata (Cnidaria).
Q. In some animal groups, the body is divided into compartments with serial repetition of at least some organs. This characteristic feature is called: [Pg-48,E]
A
segmentation
B
metamerism
C
metagenesis
D
metamorphosis
Explanation
Metamerism refers to true segmentation where the body is divided into external and internal segments with a serial repetition of at least some organs.
Q. If the body cavity of an animal is present between the body wall and gut wall but is not lined by mesoderm (instead, mesoderm is present in scattered pouches), it is called: [Pg-48,E]
A
acoelomate
B
pseudocoelomate
C
coelomate
D
haemocoelomate
Explanation
A pseudocoelomate body cavity is not fully lined by mesoderm; instead, mesoderm is present as scattered pouches between the ectoderm and endoderm (characteristic of Aschelminthes).
Q. Match the Phylum (Column-I) with its Characteristic Feature (Column-II):
(A) Porifera (1) Canal system
(B) Aschelminthes (2) Water vascular system
(C) Annelida (3) Muscular pharynx
(D) Arthropoda (4) Jointed appendages
(E) Echinodermata (5) Metameres
A
A-1, B-3, C-5, D-4, E-2
B
A-1, B-2, C-3, D-4, E-5
C
A-5, B-4, C-3, D-2, E-1
D
A-4, B-3, C-1, D-2, E-5
Explanation
Porifera is characterized by a canal system. Aschelminthes has a muscular pharynx. Annelids possess metameres. Arthropods have jointed appendages. Echinoderms possess a water vascular system.
Q. Which of the following animals are true coelomates with bilateral symmetry? [Pg-47,E]
A
Adult echinoderms
B
Aschelminthes
C
Platyhelminthes
D
Annelids
Explanation
Annelids are true coelomates with bilateral symmetry. Adult echinoderms possess radial symmetry, whereas Aschelminthes are pseudocoelomates and Platyhelminthes are acoelomates.
Q. Assertion: The primary character of chordates is the presence of dorsal hollow nerve cord. [Pg-48,H]
Reason: Vertebral column is derived from the notochord.
A
Both Assertion and Reason are true and Reason is correct explanation of Assertion.
B
Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
C
Assertion is true, but Reason is false.
D
Assertion is false, but Reason is true.
Explanation
Both statements are true. The dorsal hollow nerve cord is a key chordate feature. The vertebral column replaces the embryonic notochord in vertebrates. However, the Reason does not explain the Assertion.
Q. Assertion: Animals with radial symmetry have an advantage in detecting food and danger.
Reason: It allows the animal to respond to stimuli coming from any direction. [Pg-47,H]
A
Both Assertion and Reason are true and Reason is correct explanation of Assertion.
B
Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
C
Assertion is true, but Reason is false.
D
Assertion is false, but Reason is true.
Explanation
Radial symmetry is advantageous for sessile or slow-moving animals because it lets them receive sensory input and detect food or danger equally from all 360 degrees of their environment.
Q. Assertion: Aschelminthes represent pseudocoelomates.
Reason: In Aschelminthes, mesoderm is present as scattered pouches in between ectoderm and endoderm. [Pg-48,H]
A
Both Assertion and Reason are true and Reason is correct explanation of Assertion.
B
Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
C
Assertion is true, but Reason is false.
D
Assertion is false, but Reason is true.
Explanation
Both Assertion and Reason are true, and the Reason correctly explains why Aschelminthes are classified as pseudocoelomates (the lack of a continuous mesodermal lining of the cavity).
No bookmarked questions in this set yet.
Turn off "Bookmarked only" to see every question.
