Question 1

Given below are two statements : Statement I : The class name Reptilia refers to creeping or crawling mode of locomotion. Statement II : All organisms belonging to Reptilia have three chambered heart.

Accepted Answer

Statement I is correct because the class name Reptilia is derived from the Latin word 'repere' or 'reptum', which means to creep or crawl, referring to their mode of locomotion. Statement II is incorrect because while most reptiles have a three-chambered heart (two atria and one partially divided ventricle), crocodiles are an exception and possess a four-chambered heart. Therefore, Statement I is correct but Statement II is incorrect. Answer: Statement I is correct but Statement II is incorrect

Question 2

Select the incorrect statements from the following : A. Digestive system in Platyhelminthes is incomplete. B. Bilateral symmetry is a characteristic feature of adult Echinoderms. C. Pseudocoelom is po

Accepted Answer

Statement A is correct. Platyhelminthes have an incomplete digestive system with a single opening that serves as both mouth and anus. Statement B is incorrect. Adult echinoderms exhibit radial symmetry, whereas their larvae exhibit bilateral symmetry. Statement C is correct. Aschelminthes possess a pseudocoelom, where the body cavity is not lined by mesoderm but is present as scattered pouches. Statement D is correct. In members of the class Chondrichthyes, the notochord is persistent throughout

Question 3

Which of the following is not a characteristic of chordates ?

Accepted Answer

The fundamental characteristics of chordates include the presence of a notochord, a dorsal hollow nerve cord, paired pharyngeal gill slits, and a post-anal tail. The presence of pharyngeal gill slits is a defining feature of chordates at some stage of their life cycle. Therefore, the absence of gills is not a characteristic of chordates. Answer: Absence of gills

Question 4

Match List I with List II : List I List II A. Molluscs I. Pulmonary respiration only B. Reptiles II. Branchial respiration C. Adult amphibians III. Cellular respiration D. Amoeba IV. Pulmonary and Cut

Accepted Answer

Molluscs primarily use gills for respiration, which is known as branchial respiration. Thus, A matches II. Reptiles rely exclusively on lungs for gas exchange, which is termed pulmonary respiration. Thus, B matches I. Adult amphibians, such as frogs, can respire through both their lungs and their moist skin, utilizing pulmonary and cutaneous respiration. Thus, C matches IV. Amoeba is a unicellular organism that exchanges gases directly across its cell membrane via simple diffusion, which corresp

Question 5

A group of researchers procured some fish-like animals and upon investigation the following characters were observed : A. Endoskeleton was made of cartilage. B. Ectoparasitic, as they were found attac

Accepted Answer

The given characteristics belong to the class Cyclostomata. Members of this class are ectoparasites on some fishes. They have an elongated body bearing 6-15 pairs of gill slits for respiration. Cyclostomes have a sucking and circular mouth without jaws. Their body is devoid of scales and paired fins. Cranium and vertebral column are cartilaginous. Petromyzon (Lamprey) and Myxine (Hagfish) are examples of class Cyclostomata. Scoliodon belongs to class Chondrichthyes. Exocoetus belongs to class Os

Question 6

Select the set of fishes which belong to the class Osteichthyes :

Accepted Answer

Flying fish (Exocoetus), Angel fish (Pterophyllum), and Fighting fish (Betta) are all bony fishes belonging to the class Osteichthyes. Devil fish (Octopus) and Cuttlefish (Sepia) belong to the phylum Mollusca. Hagfish (Myxine) belongs to the class Cyclostomata. Saw fish (Pristis) and Dog fish (Scoliodon) belong to the class Chondrichthyes (cartilaginous fishes). Starfish (Asterias) belongs to the phylum Echinodermata. Answer: Flying fish, Angel fish and Fighting fish

Question 7

The flightless bird with forelimbs modified as paddle-like structures suited for swimming is known as :

Accepted Answer

Aptenodytes is the scientific name for the penguin. Penguins are flightless birds that have their forelimbs modified into paddle-like flippers, which are highly adapted for swimming. Struthio (ostrich) is flightless but adapted for running. Neophron (vulture) and Psittacula (parrot) are flying birds. Answer: Aptenodytes

Question 8

Given below are two statements : Statement I : When any plane passing through the central axis of the body divides the organism into two identical halves, it is called radial symmetry. Statement II :

Accepted Answer

Statement I is correct as it is the exact definition of radial symmetry, where any plane passing through the central axis of the body divides the organism into two identical halves. Statement II is incorrect because in the phylum Echinodermata, the adult echinoderms are radially symmetrical, but the larvae are bilaterally symmetrical.

Question 9

While trying to find out the characteristic of a newly found animal, a researcher did the histology of adult animal and observed a cavity with presence of mesodermal tissue towards the body wall but n

Accepted Answer

In pseudocoelomates, the body cavity is not entirely lined with mesoderm, instead, mesodermal tissue is present along the body wall but not towards the gut. - Schizocoelomates are animals whose coelom or body cavity develops middle from a split in the mesoderm, the middle germ layer of the embryo. - In acoelomates, coelom is absent. Spongocoel is a central cavity found in Sponges.

Question 10

All living members of the class Cyclostomata are :

Accepted Answer

All living members of class Cyclostomata are ectoparasites.

Question 11

Role of the water vascular system in Echinoderms is : A. Respiration and Locomotion B. Excretion and Locomotion C. Capture and transport of food D. Digestion and Respiration E. Digestion and Excretion

Accepted Answer

Water vascular system in Echinoderms helps in locomotion, capture and transport of food and respiration. Excretory system is absent in echinoderms. Excretion takes place through general body surface.

Question 12

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : All vertebrates are chordates but all chordates are not vertebrate. Reason (R)

Accepted Answer

Both (A) and (R) are true and (R) is the correct explanation of (A). The members of subphylum vertebrata possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult. Thus, all vertebrates are chordates but all chordates are not vertebrates.

Question 13

Match List-I with List-II. array |l|l|l|l| & List-I & & List-II \ A. & Chondrichthyes & I. & Clarias \ B. & Cyclostomata & II. & Carcharodon \ C. & Osteichthyes & III. & Myxine \ D. & Amphibia & I

Accepted Answer

The correct answer is option (3), because - Carcharodon is a cartilaginous fish which belongs to the class Chondrichthyes. - Myxine is a jawless vertebrate that belongs to the class Cyclostomata. - Clarias is a bony fish which belongs to the class Osteichthyes. - Ichthyophis is a limbless animal which belongs to the class Amphibia. Hence the correct matches are A. Chondrichthyes - Carcharodon B. Cyclostomata - Myxine C. Osteichthyes - Clarias D. Amphibia - Ichthyophis

Question 14

Open Circulatory system is present in:

Accepted Answer

The correct answer is option (3) as Anopheles (Arthropods), Limax (Mollusc) and Limulus (Arthropods) have an open circulatory system. Option (1) is incorrect as Nereis (Annelid) has a closed circulatory system. Option (2) is incorrect as Hirudinaria (Annelid) has a closed circulatory system. Option (4) is incorrect as Pheretima (Annelid) has a closed circulatory system. Arthropods (Palaemon, Bombyx, Musca) have an open circulatory system. Hemichordates (Balanoglossus) have an open circulatory sy

Question 15

Which of the following pairs is an incorrect match?

Accepted Answer

The correct answer is option (4) as it represents an incorrect match because platyhelminthes are triploblastic organisms; not diploblastic. Option (1) represents the correct match as annelids and arthropods exhibit bilateral symmetry. Option (2) represents the correct match as sponges are acoelomates. Option (3) represents the correct match as coelenterates and ctenophores exhibit radial symmetry. Hence, option (1), (2) and (3) cannot be the answer.

Question 16

Match List I with List II : array |l|l|l|l| & List I & & List II \ A. & Pleurobrachia & I. & Mollusca \ B. & Radula & II. & Ctenophora \ C. & Stomochord & III. & Osteichthyes \ D. & Air bladder &

Accepted Answer

The correct answer is option (1) as A. Pleurobrachia - is a member of phylum Ctenophora. B. Radula - is a rasping feeding organ present in phylum Mollusca. C. Stomochord - Rudimentary structure similar to notochord found in the collar region of members of phylum Hemichordata. D. Air bladder - is found in Osteichthyes which provides them buoyancy.

Question 17

Match List I with List II : Choose the correct answer from the options given below :

Accepted Answer

The correct option is option no. (1) as Pterophyllum is the scientific name for Angel fish. Myxine is the scientific name for Hag fish. Pristis is the scientific name for Saw fish. Exocoetus is the scientific name for Flying fish.

Question 18

Consider the following statements : A. Annelids are true coelomates B. Poriferans are pseudocoelomates C. Aschelminthes are acoelomates D. Platyhelminthes are pseudocoelomates Choose the correct answe

Accepted Answer

The correct answer is option no. (1), because annelids are true coelomate animals. Options (2), (3) and (4) are incorrect because poriferans are acoelomates, aschelminths are pseudocoelomates and platyhelminthes are acoelomates.

Question 19

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Members of subphylum vertebrata possess notochord during the embryonic period. The no

Accepted Answer

The correct answer is option (1) as Phylum Chordata is divided into three subphyla: Urochrodata, Cephalochordata and Vertebrata. The members of subphylum Vertebrata possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult. Thus, all vertebrates are chordates but all chordates are not vertebrates.

Question 20

The following are the statements about non-chordates: 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 t

Accepted Answer

The correct answer is option no. (2) as the features of non-chordates among the given statements are: B. Notochord is absent. D. Heart is dorsal if present. E. Post anal tail is absent. Statements A and C are features of chordates. Hence, option (2) is correct and options (1), (3) and (4) are incorrect.

Animal Kingdom — Previous Year Questions & Solutions